© 2010 Semtech Corporation
POWER MANAGEMENT
1
SC662EVB
Evaluation Board
User’s Guide
Description
SC662EVB is the evaluation board for the SC662 Light
Management Unit. The EVB is designed to provide a
working demonstration of the SC662.
This guide contains information relating to the usage of
the EVB and should be used in conjunction with the data-
sheet for the device. The datasheet contains detailed
information including the electrical characteristics and
the detailed features of the device.
This guide can be used to familiarize the user with the
features of the device and for testing electrical character-
istics of particular interest to the user.
August 26, 2010
Feature Content
EVB Schematic
EVB Bill of Material List
EVB Layout Drawings
EVB Operation
Critical and Non-Critical Components
The critical components necessary for design-in are shown
in the image below next to the 2x2 (mm) SC662 device
(not to scale). The bill of materials includes many non-criti-
cal components that are useful for evaluation purposes.
•
•
•
•
SC662EVB
SC662EVB
2
EVB Schematic 1 of 3
U1
S C662
BL6
1
SPIF
2
GND
3
C1-
4
C2-
5
C2+
6
C1+
7
OUT
8
IN
9
BL1
10
BL2
11
BL3
12
BL4
13
BL5
14
PAD
T2
C1
C3
R5
V
IN
R4
C2
R3
R7
R2
D2
R1
D3
R6
D4
D1
SPIF
Q2
2N7002
3
1
2
Q1
2N7002
3
1
2
R8
R10
R9
SPIF_NOT
SPIF
P0.2
0Ω
0Ω
0Ω
0Ω
0Ω
0Ω
0Ω
1.0µF
1.0µF
1.0µF
5V_USB
SPIF
1kΩ
1kΩ
10kΩ
GND
GND
V
OUT
C4
1.0µF
D5
D6
D7
SC662 Enabled
R25
662_LED_ENL
5V_USB
300Ω
5V_USB
GND
V
LDO
5V_USB
V
LDO
V
LDO
V
LDO
SC662EVB
3
EVB Schematic 2 of 3
R16
R21
R11
R14
Q3
2N7002
3
1
2
Q5
2N7002
3
1
2
Q7
2N7002
3
1
2
R24
Q9
2N7002
3
1
2
R19
R13
R17
R22
R30
R12
R20
R18
Q4
2N7002
3
1
2
Q6
2N7002
3
1
2
Q8
2N7002
3
1
2
R15
R23
Q4_Dr
Q3_Dr
Q5_Dr
Q6_Dr
Q7_Dr
Q8_Dr
Q9_Dr
FBA
C 8051F 321
RST/C2CK
9
P0.1
1
P0.0
2
GND
3
D+
4
D-
5
VDD
6
REGIN
7
VBUS
8
P0.7
23
P0.6
24
P0.5
25
P0.4
26
P0.3
27
P0.2
28
P3.0/C2D
10
P2.3
11
P2.2
12
P2.1
13
P2.0
14
C5
C6
JP2
1
2
3
P2.1
P2.0
5V_USB
8051_P6
USB_D-
USB_D+
662_LED_ENL
SC560_EN
Program Port
P0.2
U2
P1.2
20
P1.3
19
P1.4
18
P1.1
21
P1.0
22
P1.7
15
P1.6
16
P1.5
17
5V_USB
5V_USB
4.7µF
0.1µF
5V_USB
10kΩ
5V_USB
5V_USB
10kΩ
10kΩ
14.7kΩ
9.76kΩ
20kΩ
59kΩ
5V_USB
10kΩ
118kΩ
5V_USB
10kΩ
237kΩ
10kΩ
10kΩ
5V_USB
5V_USB 475kΩ
953kΩ
J1
USB_Type-A_Plug
1
2
3
4
F11A
USB Power
USB_D+
USB_D-
5V_USB
SC662EVB
4
EVB Schematic 3 of 3
U3
S C 560
OUTB
1
VIN
2
OUTA
3
FBA
4
GND
5
EN
6
BYP
7
FBB
8
C8
R29
R27
D8
LDO EN
R26
R28
Q10
2N7002
3
1
2
SC560_EN
SC560_EN
FBA
5V_USB
5V_USB
5V_USB
300Ω
10kΩ
9.53kΩ
1.0µF
4.99kΩ
C7
2.2µF
C9
22nF
V
LDO
SC662EVB
5
EVB Bill of Material List
Reference Value Footprint Hardware Notes
C1, C2, C3, C4 1.0μF 0603
C1, C2 are bucket capacitors
C3 is input capacitor and C4 is output capacitor
C5 4.7μF 0603 USB VBUS capacitor
C6 0.1μF 0603 VDD noise ltering capacitor
C7 2.2μF 0603 LDO input capacitor
C8 1μF 0603 LDO output capacitor
C9 22nF 0603 LDO noise ltering capacitor
D1, D2, D3, D4, D5, D6 - 1206 White LEDs for backlight functions
D7 - 0603 Green LED — SC662 enabled
D8 - 0603 Green LED — LDO enabled
F1 1A 1206 USB fuse
J1 - 3_0.100 USB type-A plug
JP2 Not populated - Program port
Q1, Q2, Q3, Q4, Q5, Q6, Q7, Q8,
Q9,
2N7002 - LDO programming switching transistors
R1, R2, R3, R4, R5, R6
0Ω
0603
Sense resistors are in series with LEDs and are placed here
(1.0Ω) recommended.
R7
0Ω
0603 Resistor is in series with SC662 output.
R8, R18, R19, R20, R21, R22, R23,
R24, R27
10kΩ 0603
Pull-up resistors
R9, R10 1kΩ 0603
R11 953kΩ 0603
LDO program resistors
R12 475kΩ 0603
R13 237kΩ 0603
R14 118kΩ 0603
R15 59kΩ 0603
R16 20kΩ 0603
R17 14.7kΩ 0603
R25, R26 300Ω 0603 Current limiting resistors for green LEDs
SC662EVB
6
EVB Bill of Material List (continued)
Reference Value Footprint Hardware Notes
R28 9.53kΩ 0603
LDO program resistorR29 4.99kΩ 0603
R30 9.76kΩ 0603
VIN not populated - IN pin test point
VOUT not populated - OUT pin test point
SPIF not populated - SemPulse test point
GND not populated - Ground test points (2)
U1 SC662
MLPQ-2 x 2
14LEAD
Semtech integrated circuit
U2 C8051F321 - USB to SemPulse interface plus GPIO
U4 SC560A - Adjustable LDO
Note:
(1) Component references in BOLD indicate critical components
SC662EVB
7
EVB Layout Drawings — Top Layer (top view)
EVB Layout Drawings — Bottom Layer (bottom view)
SC662EVB
8
EVB Layout Drawings — Layer 2 (top view)
EVB Layout Drawings — Layer 3 (top view)
SC662EVB
9
SC662 EVB Software Installation
The SC662EVB uses a USB compatible microprocessor to
communicate SemPulse
TM
commands to the SC662. The
software driver and executable program included in the
SC662 GUI Kit should rst be installed before connecting
the EVB to a USB port.
The following sequence is recommended.
Run USBXpressinstaller.exe
Place SiUSBXp.dll in the windows/system32
directory
Place SC662.xml in the same folder as
Semtech.exe
Plug the EVB into a USB port and conrm that
the USB device driver is found. USB 2.0 compli-
ant A to A cable may be used to extend the
board away from the PC for convenience when
probing the EVB.
Run Semtech.exe to start the user interface
•
•
•
•
•
EVB Operation
SC662 Software Interface Functions
The Semtech SC662 SemPulse Evaluator program fea-
tures are listed as follows.
1. Hardware Status — A green Link Status Activity
indicator ashes continuously while USB is connected.
The green light gives no indication of SemPulse
activity.
2. Main Controls — These buttons are used to enable/
disable the SC662 and to exit the program.
3. SemPulse Speed — A pull down menu for setting the
data rate of the SemPulse. The interface is capable of up
to 1Mbps performance, however, the C8051 rmware
has an approximate maximum speed of 300kbps.
4. Register Map (Write All) — One mouse click initiates
writing to all registers.
5. Register Map (8 bit binary data) — Text color is red
2
1
3
5
6
9
10
7
8
4
11
12
13
14
15
SC662EVB
10
EVB Operation (continued)
when data is in queue and green after sending.
6. Register Map (Register address in hexadecimal
notation) — One mouse click in this box will send
the 8 bits of data located in the eld to the right of
register address eld. Text color is red when data is in
queue and green after sending.
7. Backlight Bank Cong. — Pull down menu allows
the user to congure the LEDs as part of the main,
sub, or third display banks.
8. BL1 through BL6 On/O Control — Enables and
disables the backlights BL1 through BL6.
9. Demos — This group in the upper left corner
demonstrates functions using the SC662 from a
single mouse click. Each button writes multiple
SemPulse commands to re-congure the SC662.
1 Bank — Congures all backlights into one bank,
sets the current to 15mA, and enables the LEDs.
2 Banks — Congures 3 backlights for the main bank
and 3 backlights for the sub bank, sets main current to
15mA and sub current to 1.0mA, and enables the LEDs.
Fade to 15mA — Sets the main fade control to 6ms per
step and sets the main bank to 15mA. The main bank
will then fade from the current active setting to 15mA.
Fade to 0mA — Sets the main fade control to 6ms
per step and sets the main bank to 0mA. The main
bank will fade from the current active setting to 0mA.
All Banks O — Resets all registers to zero. The
backlights will be disabled.
10. Main BL Current — Sets the current for main backlight
LEDs between 0mA and 25mA.
11. Sub BL Current — Sets the current for sub backlight
LEDs between 0mA and 25mA.
12. Third BL Current — Sets the current for third backlight
LEDs between 0mA and 25mA.
13. Main Fade Control — Enables and disables the fade
feature to the main display and sets the rate of fade to
2, 4, or 6ms per step. Many non-programmable steps
are included when fading. Refer to the applications
information in the datasheet for more details on the
fade function.
14. Frequency Selection — The charge pump has two
selectable clock frequencies, 250kHz and 1MHz.
250kHz provides slightly better quiescent current
compared to 1MHz. 1MHz typically provides improved
ripple performance compared with 250kHz.
15. LDO Supply Voltage — An adjustable voltage supply
for the SC662 is provided by an on-board SC560A
LDO. The LDO is programmable between 4.16V and
2.89V in increments of 10mV — the approximate
range provided by a typical Li-Ion battery. Typical LDO
output accuracy is 1%. The LDO output is provided
as a tool to demonstate performance of the SC662
in each of charge pump modes, 1x, 1.5x, and 2x. The
default state for the LDO is 4.16V when the main
control is enabled.
SC662 Evaluation and Measurement Tips
This section provides setup information about the EVB.
Install the software and plug the EVB into a USB
port. Suggestion: A USB A to A cable may be
used to relocate the EVB away from the USB port
for easier access to the board while taking
measurements.
R1, R2, R3, R4, R5, and R6 are zero ohm resistors in
series between the sink pins (BL1 through BL6)
and the LED cathodes of D1 through D6. The
resistors may be removed for experimentation
and replaced with 1Ω 1% sense resistors for mea-
suring current with a voltmeter at 1mV/1mA.
Test points are provided for voltage measure-
ment at the right edge of the card (as shown on
page 1) for SPIF, VIN, VOUT, and GND.
•
•
•
Semtech Corporation
Power Management Products Division
200 Flynn Road, Camarillo, CA 93012
Phone: (805) 498-2111 Fax: (805) 498-3804
www.semtech.com
Contact Information
SC662EVB
11
© Semtech 2010
All rights reserved. Reproduction in whole or in part is prohibited without the prior written consent of the copyright
owner. The information presented in this document does not form part of any quotation or contract, is believed to be
accurate and reliable and may be changed without notice. No liability will be accepted by the publisher for any conse-
quence of its use. Publication thereof does not convey nor imply any license under patent or other industrial or
intellectual property rights. Semtech assumes no responsibility or liability whatsoever for any failure or unexpected
operation resulting from misuse, neglect improper installation, repair or improper handling or unusual physical or elec-
trical stress including, but not limited to, exposure to parameters beyond the specied maximum ratings or operation
outside the specied range.
SEMTECH PRODUCTS ARE NOT DESIGNED, INTENDED, AUTHORIZED OR WARRANTED TO BE SUITABLE FOR USE IN LIFE-
SUPPORT APPLICATIONS, DEVICES OR SYSTEMS OR OTHER CRITICAL APPLICATIONS. INCLUSION OF SEMTECH PRODUCTS
IN SUCH APPLICATIONS IS UNDERSTOOD TO BE UNDERTAKEN SOLELY AT THE CUSTOMER’S OWN RISK. Should a customer
purchase or use Semtech products for any such unauthorized application, the customer shall indemnify and hold
Semtech and its ocers, employees, subsidiaries, aliates, and distributors harmless against all claims, costs damages
and attorney fees which could arise.
Notice: All referenced brands, product names, service names and trademarks are the property of their respective
owners.
/
