NXP KW36/35/34 User manual

FRDM-KW36 Minimum BoM Development

Board User’s Guide

1. Introduction

This guide describes the hardware of KW36 Minimum Bill

of Material development board (reference X-UBluetooth

LEKWZ0-31417). The board is configurable, low-power,

and cost-effective. It is an evaluation and development

board for application prototyping and demonstration of the

KW36A/35A and KW36Z/35Z family of devices.

The KW36 is an ultra-low-power, highly integrated single-

chip device that enables Bluetooth® Low Energy

(Bluetooth LE) or Generic FSK (at 250, 500 and 1000

kbps) for portable, extremely low-power embedded

systems.

The KW36 integrates a radio transceiver operating in

2.36 GHz to 2.48 GHz range supporting a range of GFSK,

an Arm® Cortex®-M0+ CPU, up to 512 KB Flash and up

to 64 KB SRAM. Bluetooth LE Link Layer hardware and

peripherals optimized to meet the requirements of the target

applications.

KW36 device is also available on the FRDM-KW36

Freedom Development Board. For more information about

the FRDM-KW36 Freedom Development Board, see the

NXP Semiconductor

Document Number: MiniBoMKW36UG

User’s Guide

Rev. 0

,

09/20187

Contents

1. Introduction ....................................................................... 1

2 Overview and description .................................................. 2

2.1 Overview .................................................................2

2.2 Feature description ..................................................3

3 Functional description........................................................ 5

3.1 Block diagram .........................................................5

3.2 Generic application schematic .................................6

3.3 RF Circuit ................................................................9

3.4 Clocks ......................................................................9

3.5 Power management ................................................ 10

3.6 User Application LEDs .......................................... 15

4 I/O .................................................................................... 16

4.1 I/O pin accessibility ............................................... 16

5 Schematic......................................................................... 18

6 Layout .............................................................................. 19

7 PCB ................................................................................. 20

8 Mounted PCB .................................................................. 20

9 Component positioning .................................................... 21

10 Bill of material ................................................................. 23

Buck mode ............................................................. 23

Bypass mode .......................................................... 25

11 References ....................................................................... 27

12 Revision history ............................................................... 27

Overview and description

FRDM-KW36 Minimum BoM Development Board User’s Guide, User’s Guide, Rev. 0, 09/20187

2 NXP Semiconductos.

FRDM-KW36 Freedom Development Board User's Guide (document FRDMKW36ZUG). Find the

schematic and design files at this link (NXP web page).

2 Overview and description

The KW36 minimum BoM development board is an evaluation environment supporting NXP

KW35Z/36Z/35A/36A (KW36) Wireless Microcontrollers (MCU). The KW36 integrates a radio

transceiver operating in the 2.4 GHz band (supporting a range of GFSK and Bluetooth LE) and an Arm

Cortex-M0+ MCU into a single package. NXP supports the KW36 with tools and software that include

hardware evaluation and development boards, software development IDE, applications, drivers, and a

custom PHY with a Bluetooth LE Link Layer. The KW36 minimum BoM development board (31417)

consists of the KW36Z device with a 32 MHz reference oscillator crystal, RF circuitry (including antenna),

supplied with a coin cell CR2032 or an external power supply. The board is a standalone PCB and supports

application development with NXP’s Bluetooth Low Energy and Generic FSK libraries.

2.1 Overview

Figure 1 is a high-level block diagram of the KW36 Minimum BoM board (X-UBluetooth LEKWZ0-

31417) features:

Figure 1. KW36 Minimum BoM board block diagram

Overview and description

FRDM-KW36 Minimum BoM Development Board User’s Guide, User’s Guide, Rev. 0, 09/20187

NXP Semiconductors 3

2.2 Feature description

The KW36 Minimum BoM development board is based on TPMS development platform. It is the most

diverse reference design containing the KW36Z device and all necessary I/O connections to use as a stand-

alone board. Figure 2 shows the KW36 Minimum BoM development board.

Figure 2. KW36 Minimum BoM development board

The KW36 Minimum BoM development board includes following features:

• NXP’s ultra-low-power KW36Z Wireless MCU supporting Bluetooth LE and Generic FSK

• Reference design area with small-footprint, low-cost RF node:

o Single-ended input/output port

o Very low count of external components (minimum BoM)

• Ceramic antenna

• Selectable power sources (coin cell or external output power)

• DC-DC converter with Buck, and Bypass operation modes

• 32 MHz reference oscillator for RF operation

• 32.768 kHz reference oscillator mainly use for RTC operation and RF low-power operation

• 2.4 GHz frequency operation (ISM and MBAN)

• Coin cell connector to be able to work using a CR2032 coin cell

• Cortex 10-pin (0.05) SWD debug port for target MCU

• 1x6 Connector 6-pin UART port

• Three orange LED indicator for power and communication

• 20 available GPIOs

Overview and description

FRDM-KW36 Minimum BoM Development Board User’s Guide, User’s Guide, Rev. 0, 09/20187

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Figure 3 shows the main board features and Input/Output headers for the KW36 Minimum BoM board:

Figure 3. KW36 Minimum BoM board component placement

Functional description

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3 Functional description

The four-layer board provides the KW36 with its required RF circuitry, 32 MHz reference oscillator

crystal, and power supply with a DC-DC converter including Bypass and Buck (default) modes. The

layout for this base-level functionality can be used as a reference layout for your target board.

3.1 Block diagram

Figure 4. Block diagram (Buck mode)

Figure 5. Block diagram (Bypass mode)

Functional description

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3.2 Generic application schematic

3.2.1 Buck mode (auto-start)

Figure 6. Buck mode (auto start)

Functional description

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3.2.2 Buck mode (manual-start)

Figure 7. Buck mode (manual start)

Functional description

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3.2.3 Bypass mode

Figure 8. Bypass mode

Functional description

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3.3 RF Circuit

The KW36 Minimum BoM board RF circuit provides an RF interface for users to begin application

development. A minimum matching network to the MCU antenna pin is provided through C17 and L8.

Those two components match to the ceramic antenna through a 50 ohms controlled line. An additional

and optional matching component (R112 footprint), is provided to better filter harmonics.

Figure 9. KW36 Minimum BoM board RF circuit

3.4 Clocks

The KW36 Minimum BoM board provides two clocks. One 32 MHz for clocking MCU and Radio, and

a 32.768 kHz to provide an accurate low-power time base.

Figure 10. KW36 minimum BoM board 32 MHz reference oscillator circuit

Functional description

FRDM-KW36 Minimum BoM Development Board User’s Guide, User’s Guide, Rev. 0, 09/20187

10 NXP Semiconductos.

• 32 MHz Reference Oscillator

o Figure 10 shows the 32 MHz external crystal Y3. The KW36Z requires the frequency to

be accurate less than 10 ppm. For more details, please refer to the device datasheet.

o Internal load capacitors provide the crystal load capacitance. The internal load capacitor

is adjustable which allows the center frequency of the crystal to be tuned.

o To measure the 32 MHz oscillator frequency, program the CLKOUT (PTB0) signal to

provide buffered output clock signal (TP29).

Figure 11. KW36 Minimum BoM Board 32.786 kHz oscillator circuit

• 32.768 kHz Crystal Oscillator (for accurate low-power time base)

o A secondary 32.768 kHz crystal QZ1 is provided (see Figure 6)

o Internal load capacitors provide the entire crystal load capacitance

3.5 Power management

There are two different ways to power the KW36 Minimum BoM board. The KW36 Minimum BoM

board power-management circuit is shown in Figure 12:

Functional description

FRDM-KW36 Minimum BoM Development Board User’s Guide, User’s Guide, Rev. 0, 09/20187

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Figure 12. KW36 Minimum BoM Board power management circuit.

The KW36 Minimum BoM Board can be powered by the following means:

• From an external battery (Coin-cell – CR2032). Use jumper J4 pins 1-2 or solder R234.

• From an external DC supply in the following ways:

o Connect two wires: a wire that can supply 1.71 to 3.6 VDC (BT1-1) and another wire to

the ground (BT1-2) in bypass mode. By default, KW36 DC-DC is configured in buck

mode, then, the voltage should be in the range of 2.1 V to 3.6 V.

Orange LED marked as D4 is available as a power indicator.

The KW36 Minimum BoM Board can be configured to use either of the DCDC converter operating

modes (default). These modes are Bypass or Buck (default). Moving the configuration from buck

(default) to bypass mode need to modify some components:

Table 1. : Buck or bypass mode table

Buck mode

Bypass mode

Figure

R1

x

-

10

R2

-

x

10

R3

-

x

10

R4

x

-

10

R5

-

x

9

R6

x

-

9

R7

-

x

10

R9

x

8

R10

-

8

L3

x

-

8

Functional description

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NOTE

x (populated component), - not populated component

Figure 13. Component configuration for Buck or Bypass mode – DCDC_CFG pin

Figure 14. Component configuration for Buck or Bypass mode – PSWITCH pin

Functional description

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Figure 15. Component configuration for Buck or Bypass mode – supply pins

DCDC mode jumper configurations are described in Figure 16.

Figure 16. DCDC configurations.

Functional description

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VREFH/VREF_OUT

Circuit for VREF_OUT

VREF_OUT provides a 1.2V reference voltage that can be used as VREFH for ADC.

Figure 17. Circuit for VREF_OUT

Circuit for VREFH

VREFH is the high reference voltage for the ADC, in this circuit it will have the same values as

VDDA (Analog supply voltage).

Figure 18. Circuit for VREFH

Functional description

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3.6 User Application LEDs

The KW36 Minimum BoM Board provides an orange LED for user applications. Figure 19 shows the

circuitry for the application controlled LEDs.

- LED_COM1: SCL

- LED_COM2: SDA

- LED_COM3: RF active

Figure 19. KW36 Minimum BoM Board Orange LED circuit.

NOTE

When operating in default Buck configuration, the MCU would be

operating at 1.8 V, which means that GPIO would be operating at 1.8 V.

I/O

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4 I/O

4.1 I/O pin accessibility

Figure 20 shows the I/O pinout (TPx). Each I/O pin has its own ground to facilitate the 2 wires

connection on the PCB.

Figure 20. KW36 Minimum BoM Board I/O pinout

I/O

FRDM-KW36 Minimum BoM Development Board User’s Guide, User’s Guide, Rev. 0, 09/20187

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Table 2 shows the signals that can be multiplexed to each pin.

Table 2. Test point description

TPx

Test Point (TPx)- Description

IC

TP20

PTA16/LLWU_P4/SPI1_SOUT/UART1_RTS_b/TPM0_CH0

4

TP21

PTC18/LLWU_P2/SPI0_IN/I2C1_SDA/UART0_TX/BSM_DATA/DTM_TX/UART1_TX

47

TP22

PTC17/LLWU_P1/RF_EXT_OSC_EN/SPI0_SOUT/I2C1_SCL/UART0_RX/BSM_FRAME/DTM_RX/UART1_RX

46

TP23

PTC19/LLWU_P3/RF_EARLY_WARNING/SPI0_PCS0/I2C0_SCL/UART0_CTS_b/BSM_CLK/UART1_CTS_b

48

TP25

PTC16/LLWU_P0/SPI0_SCK/I2C0_SDA/UART0_RTS_b/TPM0_CH3/UART1_RTS_b

45

TP26

PTC1/DIAG1/RF_EARLY_WARNING/ANT_B/I2C0_SDA/UART0_RTS_b/TPM0_CH2/SPI1_SCK/BSM_CLK

37

TP27

PTC2/LLWU_P10/TSI0_CH14/DIAG1/TX_SWITCH/I2C1_SCL/UART0_RX/CMT_IRO/DTEST6/DTM_RX

38

TP28

PTC3/DIAG3/LLWU_P11/RX_SWITCH/I2C1_SDA/UART0_TX/TPM0_CH1/DTM_TX/SPI1_SIN/CAN0_TX

39

TP29

PTB0/LLWU_P8/RF_RFOSC_EN/RF_DFT_RESET/I2C0_SCL/CMP0_OUT/TPM0_CH1/CLKOUT/CAN0_TX

16

TP30

PTB1/ADC0_SE1/CMP0_IN5/RF_PRIORITY/DTM_RX/I2C0_SDA/LPTMR0_ALT1/TPM0_CH2/CMT_IRO/CAN0_RX

17

TP31

PTC4/DIAG4/RF_ACTIVE/LLWU_P12/ANT_A/EXTRG_IN/UART0_CTS_b/TPM1_CH0/BSM_DATA/SPI1_PCS0/CAN0_RX

40

TP32

PTC5/LLWU_P13/RF_RF_OFF/ LPTMR0_ALT2/UART0_RTS_b/TPM1_CH1/BSM_CLK

41

TP34

PTA17/LLWU_P5/RF_DFT_RESET/SPI1_SIN/UART1_RX/CAN0_TX/TPM_CLKIN1

5

TP35

PTA18/LLWU_P6/SPI1_SCK/ UART1_TX/CAN0_RX/TPM2_CH0

6

TP36

PTA19/ADC0_SE5/LLWU_P7/SPI1_PSC0/UART1_CTS_b/TMP2_CH1

7

TP37

PTB2/ADC0_SE3/CMP0_IN3/RF_OFF/TPM1_CH0/DTEST13/DCDC_TESTO5

18

TP38

PTB3/ADC0_SE2/CMP0_IN4/CLKOUT/TPM1_CH1/DTEST9/RTC_CLKOUT/ERCLK32K

19

TP42

PTB18/DAC0_OUT/ADC0_SE4/CMP0_IN2/I2C1_CLK/TPM_CLKIN0/TPM0_CH0/DTEST8/NMI

23

TP46

ADC0_DP0/CMP0_IN0

24

TP47

ADC0_DP0/CMP0_IN1

25

Table 3. UART connector pinout (JP3)

HDR Pin

1x6 Connector (JP3) - Description

IC Pin

1

GND

-

2

FTDI cable CTS / PTC5

41

3

FTDI cable VCC / VBAT_PWR

-

4

FTDI cable TXD / UART0_RX

42

5

FTDI cable RXD / UART0_TX

43

6

FTDI cable RTS / PTC4

40

Table 4. SWD connector pinout (J14)

HDR Pin

2x5 Connector (J14) - Description

IC Pin

1

VDD_1P8F

-

2

PTA0_SWD_DIO

1

3

GND

-

4

PTA1_SWD_CLK

2

5

GND

-

6

NC

-

7

NC

-

8

NC

-

9

NC

-

10

RST_TGTMCU_b

3

Schematic

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5 Schematic

Layout

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NXP Semiconductors 19

6 Layout

Figure 21. Layout

Mounted PCB

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20 NXP Semiconductos.

7 PCB

Figure 22. PCB

8 Mounted PCB

Figure 23. Mounted PCB

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