Neoway A90 User guide

Neoway
Brand
Neoway
Model
A90
Type
User guide
Hardware User Guide
Issue 1.0 Date 2019-08-22
A90 Hardware User Guide
Copyright
Copyright © Neoway Technology Co., Ltd
i
Copyright © Neoway Technology Co., Ltd 2019. All rights reserved.
No part of this document may be reproduced or transmitted in any form or by any means without prior written
consent of Neoway Technology Co., Ltd.
is the trademark of Neoway Technology Co., Ltd.
All other trademarks and trade names mentioned in this document are the property of their respective
holders.
Notice
This document provides guide for users to use A90.
This document is intended for system engineers (SEs), development engineers, and test engineers.
THIS GUIDE PROVIDES INSTRUCTIONS FOR CUSTOMERS TO DESIGN THEIR APPLICATIONS.
PLEASE FOLLOW THE RULES AND PARAMETERS IN THIS GUIDE TO DESIGN AND COMMISSION.
NEOWAY WILL NOT TAKE ANY RESPONSIBILITY OF BODILY HURT OR ASSET LOSS CAUSED BY
IMPROPER OPERATIONS.
THE INFORMATION IN THIS DOCUMENT IS SUBJECT TO CHANGE WITHOUT NOTICE DUE TO
PRODUCT VERSION UPDATE OR OTHER REASONS.
EVERY EFFORT HAS BEEN MADE IN PREPARATION OF THIS DOCUMENT TO ENSURE ACCURACY
OF THE CONTENTS, BUT ALL STATEMENTS, INFORMATION, AND RECOMMENDATIONS IN THIS
DOCUMENT DO NOT CONSTITUTE A WARRANTY OF ANY KIND, EXPRESS OR IMPLIED.
Neoway provides customers complete technical support. If you have any question, please contact your
account manager or email to the following email addresses:
[email protected]
[email protected]
Website: http://www.neoway.com
A90 Hardware User Guide
Contents
Copyright © Neoway Technology Co., Ltd
ii
Contents
1 About A90 .................................................................................................. 8
1.1 Product Overview ......................................................................................................................... 8
1.2 Block Diagram .............................................................................................................................. 8
1.3 Basic Features ............................................................................................................................. 9
2 Module Pins ............................................................................................. 11
2.1 Pad Layout .................................................................................................................................. 11
2.2 Pin Description ........................................................................................................................... 12
3 Application Interfaces .............................................................................. 17
3.1 Power Interface .......................................................................................................................... 17
3.1.1 Voltage Drop ...................................................................................................................... 17
3.1.2 Reference Power Supply Design ...................................................................................... 19
3.2 Control Interfaces ....................................................................................................................... 20
3.2.1 ON/OFF ............................................................................................................................. 20
3.2.2 RESET_N .......................................................................................................................... 22
3.3 Peripheral Interfaces .................................................................................................................. 24
3.3.1 USB ................................................................................................................................... 24
3.3.2 UART ................................................................................................................................. 26
3.3.3 PCIe ................................................................................................................................... 27
3.3.4 SPI ..................................................................................................................................... 28
3.3.5 I2C ..................................................................................................................................... 30
3.4 RF Interface ................................................................................................................................ 30
3.4.1 ANT_MAIN/ ANT_DRX ...................................................................................................... 31
3.4.2 GNSS Antenna Interface ................................................................................................... 32
3.5 GPIO .......................................................................................................................................... 34
3.6 Other Interfaces ......................................................................................................................... 34
3.6.1 ADC ................................................................................................................................... 34
3.6.2 FORCE_USB ..................................................................................................................... 35
4 Electric Feature and Reliability ................................................................ 36
4.1 Electric Features ........................................................................................................................ 36
4.2 Temperature Features ................................................................................................................ 37
4.3 ESD Protection ........................................................................................................................... 37
5 Mechanical Features ............................................................................... 39
5.1 Dimensions ................................................................................................................................. 39
5.2 Label ........................................................................................................................................... 39
5.3 Three Views ............................................................................................................................... 40
5.4 Package ..................................................................................................................................... 40
5.4.1 Reel ................................................................................................................................... 40
5.4.2 Moisture-Sensitivity ........................................................................................................... 41
6 Mounting A90 onto the Application Board ................................................ 42
A90 Hardware User Guide
Contents
Copyright © Neoway Technology Co., Ltd
iii
6.1 Application Foot Print ................................................................................................................. 42
6.2 Stencil ......................................................................................................................................... 43
6.3 Solder Paste ............................................................................................................................... 43
6.4 SMT Furnace Temperature Curve .............................................................................................. 43
7 Safety Recommendations ....................................................................... 45
Conformity and Compliance .................................................................... 46
A.1 Approvals ................................................................................................................................... 46
A.2 Chinese Notice........................................................................................................................... 46
A.2.1 CCC Class A Digital Device Notice ................................................................................... 46
A.2.2 Environmental Protection Notice ....................................................................................... 46
Abbreviation ............................................................................................ 47
A90 Hardware User Guide
Table of Figures
Copyright © Neoway Technology Co., Ltd
iv
Table of Figures
Figure 1-1 Block diagram ................................................................................................................... 9
Figure 2-1 A90 pad layout ................................................................................................................. 11
Figure 3-1 Supply voltage drops ...................................................................................................... 18
Figure 3-2 Recommended power design ......................................................................................... 18
Figure 3-3 Reference design of power circuit .................................................................................. 19
Figure 3-4 Reference design of startup controlled by MCU ............................................................. 20
Figure 3-5 Reference design of startup controlled by button ........................................................... 21
Figure 3-6 Startup timing .................................................................................................................. 21
Figure 3-7 PON_1 startup ................................................................................................................ 22
Figure 3-8 Shutdown timing ............................................................................................................. 22
Figure 3-9 Reference circuit of RESET_N driven by open collector ................................................ 23
Figure 3-10 Reference circuit of RESET_N with button................................................................... 23
Figure 3-11 Reset timing .................................................................................................................. 24
Figure 3-12 USB 2.0 connection ...................................................................................................... 25
Figure 3-13 Recommended level shifting circuit .............................................................................. 27
Figure 3-14 Reference design of SPI ............................................................................................... 29
Figure 3-15 SPI timing ..................................................................................................................... 29
Figure 3-16 Pi network ..................................................................................................................... 31
Figure 3-17 Recommended RF PCB design ................................................................................... 32
Figure 3-18 Reference design of active GNSS antenna .................................................................. 33
Figure 3-19 Reference design of FORCE_USB .............................................................................. 35
Figure 5-1 A90 dimensions .............................................................................................................. 39
Figure 5-2 A90 label ......................................................................................................................... 40
Figure 5-3 Three views of A90 ......................................................................................................... 40
Figure 6-1 Recommended PCB foot print of A90 ............................................................................. 42
Figure 6-2 SMT furnace temperature curve ..................................................................................... 43
A90 Hardware User Guide
Table of Tables
Copyright © Neoway Technology Co., Ltd
v
Table of Tables
Table 1-1 A90 frequency bands .......................................................................................................... 8
Table 2-1 IO definition ...................................................................................................................... 12
Table 2-2 Pin description .................................................................................................................. 12
Table 3-1 A90 power pins and GND pins ......................................................................................... 17
Table 3-2 Pin definition ..................................................................................................................... 20
Table 3-3 Reset pin .......................................................................................................................... 23
Table 3-4 USB pins........................................................................................................................... 24
Table 3-5 Pins of main UART ........................................................................................................... 26
Table 3-6 Pins of debugging UART .................................................................................................. 26
Table 3-7 Logic level of UART interfaces ......................................................................................... 26
Table 3-8 PCIe pins .......................................................................................................................... 27
Table 3-9 Pins of SPI interface ......................................................................................................... 28
Table 3-10 Timing parameters of SPI interface ................................................................................ 30
Table 3-11 Pins of I2C interface ....................................................................................................... 30
Table 3-12 RF interfaces .................................................................................................................. 31
Table 3-13 Operating bands of A90 .................................................................................................. 31
Table 3-14 RF indicators of A90 ....................................................................................................... 31
Table 3-15 GNSS RF features ......................................................................................................... 32
Table 3-16 GPIO pins ....................................................................................................................... 34
Table 3-17 ADC pins ........................................................................................................................ 34
Table 3-18 ADC Voltage Feature ...................................................................................................... 35
Table 4-1 Absolute maximum rating ................................................................................................. 36
Table 4-2 Current feature ................................................................................................................. 36
Table 4-3 GNSS current feature ....................................................................................................... 37
Table 4-4 Temperature feature of A90 .............................................................................................. 37
Table 4-5 A90 ESD protection .......................................................................................................... 37
A90 Hardware User Guide
About This Document
Copyright © Neoway Technology Co., Ltd
vi
About This Document
Scope
This document is applicable to A90 series.
It defines the features, indicators, and test standards of the A90 module and provides reference for the
hardware design of each interface.
Audience
This document is intended for system engineers (SEs), development engineers, and test engineers.
Change History
Issue
Date
Changed By
1.0
2019-08
Wu Wentao
Conventions
Symbol
Indication
This warning symbol means danger. You are in a situation that could cause fatal
device damage or even bodily damage.
Means reader be careful. In this situation, you might perform an action that could
result in module or product damages.
Means note or tips for readers to use the module
A90 Hardware User Guide
About This Document
Copyright © Neoway Technology Co., Ltd
vii
Related Documents
Neoway_A90_Datasheet
Neoway_A90_Product_Specifications
Neoway_A90_AT_Command_Mannual
Neoway_A90_EVK_User_Guide
A90 Hardware User Guide
Chapter 1 About A90
Copyright © Neoway Technology Co., Ltd. All rights reserved.
8
1 About A90
A90 is a C-V2X cellular module that is developed on Qualcomm chipset. It adopts ARM Cortext A7
processor, the frequency of which is up to 1.28 GHz. Operating in the 5.9 GHz ITS spectrum, A90
supports point-to-point communication with low latency. It meets the 3GPP Release 14 C-V2X PC5
protocol and can extend the communication scope without the assistance of cellular networks.
1.1 Product Overview
Table 1-1 shows the variants and frequency bands of A90.
Table 1-1 A90 frequency bands
Model
Category
Band
GNSS
A90
C-V2X
B47
GPS, GLONASS, BDS,
Galileo
LTE-TDD
B461
1.2 Block Diagram
A90 consists of the following functionality units:
⚫ Baseband
⚫ Power management unit
⚫ DDR+NAND memory
⚫ Peripheral Interfaces
⚫ RF interfaces (main antenna, diversity antenna, GNSS antenna)
1
Optional for A90
A90 Hardware User Guide
Chapter 1 About A90
Copyright © Neoway Technology Co., Ltd. All rights reserved.
9
Figure 1-1 Block diagram
1.3 Basic Features
Parameter
Description
Physical features
⚫ Dimensions: 28.0 mm× 32.0 mm× 2.7 mm
⚫ Package: 188-pin LGA
⚫ Weight: TBD
Temperature
ranges
Operating: -35°C to +75°C
Extended2: -40°C to +85°C
Storage: -40°C to + 90°C
2
Some RF indicators might not meet 3GPP/3GPP2 standards in extended temperature range but it does not affect
functioning.
PMIC
38
.
4
M
XO
Baseband
NAND
Flash
and
LPDDR2
control
Transceiver
control
QLINK
PA
TX
QLNA
QLNA
PRX
DRX
BPF
BPF
SAW
PCIE
USB
2
*
SPI
UART*2
I2C
GPIOS
ADC
*
3
RESET
_
N
PWRKEY
VDD
_
EXT
V
PWR
_
BB
_
3
V
8
V
PWR
_
RF
_
5
V
0
ANT
_
MAIN
ANT
_
DRX
ANT
_
GNSS
control
A90 Hardware User Guide
Chapter 1 About A90
Copyright © Neoway Technology Co., Ltd. All rights reserved.
10
Operating voltage
VBAT_BB_3V8: 3.3V to 4.3V, TYP: 3.8V
VBAT_RF_5V0: 4.75V to 5.25V, TYP: 5.0V
Current
Flight mode
TBD
Sleep mode
C-V2X TDD B47: TBD
C-V2X TDD PF=128: TBD
Operating
VBAT_BB_3V8: 1.5A MAX
VBAT_RF_5V0: 1.5A MAX
MIPS processor
ARM Cortex-A7 processor, 1.28 GHz main frequency, 256kB L2 cache
Memory
RAM: 256MB
ROM: 512MB
Band
See Table 1-1.
Wireless rate
TBD
Transmit power
TBD
Application
Interfaces
One main antenna interface
One diversity antenna interface
One GNSS antenna interface
One USB 2.0/USB 3.0 high-speed interface
Supports USB 3.0 super speed mode/USB 2.0 high-speed mode
One PCIe interface, used for communication with MCU
Two UART interfaces: one for data communication with peripherals and one
for Linux control and log output
Two SPI interfaces, supports master mode only, 50MHz clock frequency max.
One I2C interface, in compliance with I2C bus protocol 5.0, not support
multiple hosts mode
One 1PPS interface: GNSS one pulse per second
Three ADC interfaces3, 14-bit, detectable voltage ranging from 0V to 1.875V.
Five GPIOs, in 1.8V power domain
Certification
approval
TBD
3
ADC1 and ADC2 are in development.
A90 Hardware User Guide
Chapter 2 Module Pins
Copyright © Neoway Technology Co., Ltd. All rights reserved.
11
2 Module Pins
There are 188 pins on A90 and their pads are introduced in LGA package.
2.1 Pad Layout
Figure 2-1 shows the pad layout of A90.
Figure 2-1 A90 pad layout
179 180 181 182 183 184 185 186
171 172 173 174 175 176 177 178
163 164 165 166 167 168 169 170
155 156 157 158 159 160 161 162
147 148 149 150 151 152 153 154
139 140 141 142 143 144 145 146
131 132 133 134 135 136 137 138
31
33
35
37
39
41
43
45
47
49
51
53
55
57
59
61
63
30
32
34
36
38
40
42
44
46
48
50
52
54
56
58
60
62
64
127
125
123
121
119
117
115
113
111
109
107
105
103
101
99
97
95
128
126
124
122
120
118
116
114
112
110
108
106
104
102
100
98
96
94
2
4
6
8
10
12
14
16
18
20
22
24
26
28
92
90
88
86
84
82
80
78
76
74
72
70
68
66
1
3
5
7
9
11
13
15
17
19
21
23
25
27
29
93
91
89
87
85
83
81
79
77
75
73
71
69
67
65
130
188
187
129
Power Pins GND Pins PCIe RESVRVED
ADC Pins UART Pins IIC Pins USB Pins
ANT Other Pins SPI Pins GPIO Pins
A90 Hardware User Guide
Chapter 2 Module Pins
Copyright © Neoway Technology Co., Ltd. All rights reserved.
12
2.2 Pin Description
Table 2-1 lists the definition of IO types.
Table 2-1 IO definition
IO
Description
IO
Input and output
DI
Digital input
DO
Digital output
PI
Power input
PO
Power output
AI
Analog input
AO
Analog output
AIO
Analog input/output
Table 2-2 Pin description
Signal
Pin
I/O
Function
Level Feature
Remarks
Power interface
VBAT_BB_3V8
112,
113,
114
PI
Power input of A90
baseband
Vmax=4.3V
Vmin=3.3V
Vnorm=3.8V
Peak current is up to
1.5A.
VBAT_RF_5V0
108,
109,
110
PI
RF power input
Vmax=5.25V
Vmin=4.75V
Vnorm=5.0V
Peak current is up to
1.5A.
VDD_EXT _1P8
60
PO
1.8V power output
Vnorm=1.8V
IOmax=100mA
Used only for level
shifting
GND
2, 16, 28, 32, 35, 38, 41, 42, 45, 48, 51, 62, 63, 66~68, 79,
80, 89, 90, 92~95, 97~99, 101, 102, 105~107, 115~117,
127,129~188
Ensure that all GND
pins are connected to
the ground.
Control Interfaces
PWRKEY
1
DI
ON/OFF button
Triggered by low
level, connected to
the 1.8V power
domain through an
internal 200 kΩ pull-
up resistor
A90 Hardware User Guide
Chapter 2 Module Pins
Copyright © Neoway Technology Co., Ltd. All rights reserved.
13
PON_1
122
DI
Trigger startup at high
level
Connect the pin to
1.8V or
VBAT_BB_3V8, and
the module starts
automatically
RESET_N
3
DI
Reset the module
Triggered by low
level, connected to
the 1.8V power
domain through an
internal 40 kΩ pull-up
resistor
USB interface
USB_VBUS
30
PI
USB power detect
Vmax=5.25V
Vmin=3.0V
Vnorm=5.0V
USB_HS_DM
34
AIO
USB differential data
(-)
In compliance with USB 2.0
90Ω differential impedance
USB_HS_DP
33
AIO
USB differential data
(+)
USB_SS_RX_P
36
AI
USB 3.0 differential
RX (+)
In compliance with USB 3.0
90Ω differential impedance
USB_SS_RX_M
37
AI
USB 3.0 differential
RX (-)
USB_SS_TX_M
39
AO
USB 3.0 differential
TX (-)
USB_SS_TX_P
40
AO
USB 3.0 differential
TX (+)
USB_ID
31
DI
USB ID detect
Debugging UART
DBG_UART_RXD
4
DI
DBG_UART RX data
VILmin=-0.3V
VILmax=0.63V
VIHmin=1.26V
VIHmax=2.1V
1.8V power domain
Leave it floating if it is
not used
DBG_UART_TXD
5
DO
DBG_UART TX data
VOLmax =0.45V
VOHmin=1.35V
1.8V power domain
Leave it floating if it is
not used
UART
UART_TXD
120
DO
UART TX data
VOLmax =0.45V
VOHmin=1.35V
1.8V power domain
Leave it floating if it is
not used
A90 Hardware User Guide
Chapter 2 Module Pins
Copyright © Neoway Technology Co., Ltd. All rights reserved.
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UART_RXD
121
DI
UART RX data
VILmin=-0.3V
VILmax=0.63V
VIHmin=1.26V
VIHmax=2.1V
1.8V power domain
Leave it floating if it is
not used
UART_RTS
118
DI
UART request to
send
VILmin=-0.3V
VILmax=0.63V
VIHmin=1.26V
VIHmax=2.1V
1.8V power domain
Leave it floating if it is
not used
UART_CTS
119
DO
UART clear to send
VOLmax =0.45V
VOHmin=1.35V
1.8V power domain
Leave it floating if it is
not used
ADC interfaces
ADC1
125
AI
General analog-
digital converter
interface
Voltage range:
0V~1.875V
in development
phrase
ADC2
126
AI
General analog-
digital converter
interface
in development
phrase
ADC3
128
AI
General analog-
digital converter
interface
Leave this pin floating
if it is not used.
PCIe interface
PCIE_TX_M
43
AO
PCIe differential data
TX (-)
Leave this pin floating
if it is not used.
PCIE_TX_P
44
AO
PCIe differential data
TX (+)
Leave this pin floating
if it is not used.
PCIE_REFCLK
_P
46
AI
PCIe reference clock
(+)
Leave this pin floating
if it is not used.
PCIE_REFCLK
_M
47
AI
PCIe reference clock
(-)
Leave this pin floating
if it is not used.
PCIE_RX_M
49
AI
PCIe differential RX
(-)
Leave this pin floating
if it is not used.
PCIE_RX_P
50
AI
PCIe differential RX
(+)
Leave this pin floating
if it is not used.
PCIE_CLK_
REQ_N
52
DO
PCIe clock
request
VOLmax=0.45V
VOHmin=1.35V
PCIE_RST_N
53
DI
PCIe reset signal
VILmin=-0.3V
VILmax=0.63V
VIHmin=1.26V
VIHmax=2.1V
A90 Hardware User Guide
Chapter 2 Module Pins
Copyright © Neoway Technology Co., Ltd. All rights reserved.
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PCIE_WAKE_N
54
DO
PCIe wakeup signal
VOLmax=0.45V
VOHmin=1.35V
I2C interface
I2C_SDA
6
IO
I2C data
No internal pull-up
resistor
I2C_SCL
7
DO
I2C clock
No internal pull-up
resistor
SPI interface
SPI1_CS_N
8
DO
SPI1 chip select
VOLmax =0.4V
VOHmin=1.44V
1.8V power domain
Leave this pin floating
if it is not used.
SPI1_CLK
9
DO
SPI1 clock
VOLmax =0.4V
VOHmin=1.44V
1.8V power domain
Leave this pin floating
if it is not used.
SPI1_MOSI
10
DO
SPI1 master data
output
VOLmax =0.4V
VOHmin=1.44V
1.8V power domain
Leave this pin floating
if it is not used.
SPI1_MISO
11
DI
SPI1 master data
input
VILmin=-0.3V
VILmax =0.63V
VIHmin=1.26V
VIHmax=2.1V
1.8V power domain
Leave this pin floating
if it is not used.
SPI2_CS_N
55
DO
SPI2 chip select
VOLmax =0.45V
VOHmin=1.35V
1.8V power domain
Leave this pin floating
if it is not used.
SPI2_CLK
56
DO
SPI2 clock
VOLmax =0.45V
VOHmin=1.35V
1.8V power domain
Leave this pin floating
if it is not used.
SPI2_MOSI
57
DO
SPI2 master data
output
VOLmax =0.45V
VOHmin=1.35V
1.8V power domain
Leave this pin floating
if it is not used.
SPI2_MISO
58
DI
SPI2 master data
input
VILmin=-0.3V
VILmax =0.63V
VIHmin=1.26V
VIHmax=2.1V
1.8V power domain
Leave this pin floating
if it is not used.
RF Interface
ANT_MAIN
96
AIO
Main antenna
interface
50Ω characteristics
impedance
ANT_DRX
91
AI
Diversity antenna
interface
50Ω characteristics
impedance
A90 Hardware User Guide
Chapter 2 Module Pins
Copyright © Neoway Technology Co., Ltd. All rights reserved.
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ANT_GNSS
65
AI
GNSS antenna
interface
50Ω characteristics
impedance
GPIO pin
GPIO_18
18
IO
GPIO
VILmin=-0.3V
VILmax=0.63V
VIHmin=1.26V
VIHmax=2.1V
VOLmax=0.45V
VOHmin=1.35V
1.8V power domain
Leave this pin floating
if it is not used.
GPIO_19
19
GPIO_20
20
GPIO_21
21
GPIO_61
61
Other pins
FORCE_USB
59
DI
Control forcible USB-
boot mode
Connect it to
VDD_EXT_1P8
through a pull-up
resistor transiently
before the module is
started, and the
module will enter
download mode.
1PPS
70
DO
GNSS one pulse per
second output
RESERVED
12~15, 17,
22~27, 29, 64,
69, 71~78,
81~88, 100,
103, 104, 111,
123, 124
Reserved
Floating
*Leave pins floating if they are not used and noted.
A90 Hardware User Guide
Chapter 3 Application Interfaces
Copyright © Neoway Technology Co., Ltd. All rights reserved.
17
3 Application Interfaces
A90 provides power supply, control, communications, RF, and other interfaces to meet customers
requirements in different application scenarios. This chapter describes how to design each interface
and provides reference designs and guidelines.
3.1 Power Interface
A90 provides 6 power pins that should be connected to two different power domains. It also provides
one power output pin. Table 3-1 lists these power pins and GND pins.
Table 3-1 A90 power pins and GND pins
Signal
Pin
Function
Remarks
VBAT_BB_3V8
112, 113, 114
Power input of A90
baseband
3.3V~4.3V (TYP: 3.8V)
VBAT_RF_5V0
108, 109, 110
RF power input
4.75V~5.25V (TYP: 5.0V)
VDD_EXT_1V8
60
1.8V power output
Output 100mA at most, used only for
level shifting.
Add ESD protector when using this pin.
GND
2, 16, 28, 32, 35 38, 41, 42, 45, 48, 51,
62, 63, 66~68, 79, 80, 89, 90, 92, 95,
97~99, 101, 102, 105~107, 115~117,
127, 129~188
Ensure that all GND pins are connected
to the ground.
3.1.1 Voltage Drop
The supply voltage for A90 baseband ranges from 3.3V to 4.3V and the input voltage should not be
lower than 3.3V. Figure 3-1 shows the voltage drop in burst transmission on C-V2X networks.
A90 Hardware User Guide
Chapter 3 Application Interfaces
Copyright © Neoway Technology Co., Ltd. All rights reserved.
18
Figure 3-1 Supply voltage drops
Transmit
burst Transmit
burst
Input
current
VBAT
Drop
Figure 3-2 shows the reference design of the power supply.
Figure 3-2 Recommended power design
C1
C2
C3
10pF33pF100nF
D1
C5
C6
C7
C8
D3
C4
100μF
VBAT_RF_5V0
VBAT_BB_3V8
VBAT_RF_5V0
VBAT_BB_3V8
A90
Module
10pF33pF100nF
100μF
Schematic Guidelines:
⚫ To reduce voltage drops, add a 100 μF filter capacitor with low ESR.
⚫ Reserve three MLCC capacitors (100 nF, 33 pF, and 10 pF) with best ESR performance for
VBAT_BB_3V8 and VBAT_RF_5V0.
⚫ Add TVS diodes before the power is input into VBAT_BB_3V8 and VBAT_RF_5V0 to protect the
module from current surge.
PCB Layout Guidelines:
⚫ Place the MLCC components close to the pins. If an external power source is connected to the
module, keep the trace width of VBAT_BB_3V8 larger than 1.5mm.
A90 Hardware User Guide
Chapter 3 Application Interfaces
Copyright © Neoway Technology Co., Ltd. All rights reserved.
19
⚫ keep the trace width of VBAT_RF_5V0 larger than 1.5mm. In principle, the longer the VBAT
trace is, the wider the trace is.
3.1.2 Reference Power Supply Design
If you select a 12V/24V power system as the power supply of A90, use a DC-DC chipset with a wide
voltage range, such as TPS54340DDAR from TI. Figure 3-3 shows the reference design of a 12V/24V
power supply.
Figure 3-3 Reference design of power circuit
VIN
EN
RT/CLK
P-PAD
GND
BOOST
SW
FB
COMP
R1
47.5KΩ
12KΩ
100pF 0.01uF
L1
3.3uH
0.1uF
VBAT
470uF 22uF 22uF 0.1uF 100pF 33pF
1kΩ
47.5kΩ
12kΩ
SS36
TPS54340
D1
C4 C5
C6
C7 C8 C9 C10 C11 C12
R2
R3
R4
R5
VIN
(4.5V-42V)
C1
100UF
C2
22UF
C3
0.1UF
PWR_EN
Schematic Guidelines:
⚫ TPS54340DDAR outputs 3.5A current. A90 requires a power source that can supply at least 3A.
⚫ 500 kHz or larger switching frequency is recommended for DC-DC. The inductance depends on
the switching frequency.
⚫ The switching frequency might produce EMC jamming and it determines the performance of end
products.
⚫ Add surge protection to the front end of the power supply circuit if automotive battery supplies
power. The maximum safe operating voltage of the component should be larger than 42V.
⚫ For more design guidelines, see TPS54340DDAR datasheet.
Electronics used in vehicles must meet strict test standards and requirements for power supply, for example,
transient Pulse1/2a/5a. To meet these requirements, you need to design a dedicated protection circuit based on
application scenarios. Figure 3-3 shows a simple reference circuit, which might not pass the test for in-vehicle
power supply.
Texas Instruments launched a series of power supply solutions to in-vehicle electronics. For more information,
contact them.
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Neoway A90 User guide

Neoway
Brand
Neoway
Model
A90
Type
User guide
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