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IS31BL3231-DLS2-EB

P1-P3P4-P6
IS31BL3231 Flash LED Driver Evaluation Board Guide
Integrated Silicon Solution, Inc. – www.issi.com 1
V3, 3/16/2012
Description
IS31BL3231 flash LED driver demo board is used to
demonstrate and evaluate the IS31BL3231. The
IS31BL3231 is a current-regulated charge pump and
ideal for powering high brightness LEDs for camera
flash and torch applications. The charge pump can be
set to regulate two current levels for Flash Mode and
Torch Mode.
Features
Supply voltage range from 2.7V to 5.5V
Output current up to 750mA
Adjustable output current in Flash Mode
Automatic boost mode
Available in DFN-10 (3mm × 3mm) package
Quick Start
Figure 1: Photo of IS31BL3231 Evaluation Board
Recommended Equipment
5.0V, 2A power supply
Absolute Maximum Ratings
≤ 5.5V power supply
Caution: Do not exceed the conditions listed above; otherwise
the board will be damaged.
Procedure
The IS31BL3231 demo board is fully assembled and
tested. Follow the steps listed below to verify board
operation.
Caution: Do not turn on the power supply until all connections
are completed.
1. Connect the ground terminal of the power supply
to the GND pin and the power supply’s positive
terminal to the VCC pin.
2. Alternatively, a DC source can be connected
directly to the (DC IN) connector.
3. Turn on the power supply and pay attention to the
supply current. If it is over 2A, please check
evaluation board for any faults; if errors are
evident please contact ISSI immediately.
4. Switch between Torch Mode and Flash Mode via
corresponding push button on board.
Ordering Information
Part No. Temperature Range Package
IS31BL3231-DLS2-EB -40°C to +85°C (Industrial) DFN-10 (3mm x 3mm), Lead-free
Table 1: Ordering Information
For additional information regarding orders, pricing, and delivery, please contact ISSI at
analog_mkt@issi.com
or (408) 969-6600.
IS31BL3231 Flash LED Driver Evaluation Board Guide
Integrated Silicon Solution, Inc. – www.issi.com 1
V3, 3/16/2012
Performance Display
The IS31BL3231 Flash LED Driver can function in Flash Mode or Torch Mode. Torch is set as the default mode.
Torch Mode: The White LEDs are working in the Torch Mode when power on. There are 8 blue LEDs showing
the intensity level. The intensity of LEDs will be increased at 8 steps by pressing the Bright+ button, and
decreased by pressing the Bright- button. Press the Torch button in this mode to operating in the Flash Mode.
Flash Mode: The Flash Mode is activated when shut down the Torch Mode. The high brightness LEDs will
flash once by clicking the Flash button.
Software Support
Please refer to the integrated evaluation board software. It is pre-programmed for easy set-up and demonstration.
For more information on IS31BL3231, please refer to the device’s datasheet.
IS31BL3231 Flash LED Driver Evaluation Board Guide
Integrated Silicon Solution, Inc. – www.issi.com 1
V3, 3/16/2012
Figure 2: IS31BL3231 Application Circuit Diagram
Bill of Materials
Name Symbol Description Qty Supplier Part No.
LDO U1 Low Drop-out Regulator 1 PAM PAM3101DAB300
MCU U2 System Microcontroller 1 NXP P89LPC936
LED Driver U3 LED Backlighting Driver 1 ISSI IS31BL3231
Diode D1-8 Diode, LED Blue, SMD 8 Everlight 19-217/BHC-ZL1M2RY/3T
Diode D10-11 Diode, LED White, SMD 2 Everlight EHP-C04/UT01-P01/TR
Resistor R1-R14 RES,10k,1/16W,±5%,SMD 14 - -
Resistor R15,R16 RES,91k,1/16W,±5%,SMD 2 - -
Resistor R17 Not Connected 1 - -
Resistor R18 RES,0.22Ω,1/16W,±5%,SMD 1 - -
Capacitor C1,C3,C8,C9 CAP,10µF,16V,±20%,SMD 4 - -
Capacitor C2 CAP,10nF,16V,±20%,SMD 1 - -
Capacitor C4,C6,C7 CAP,0.1µF,16V,±20%,SMD 3 - -
Capacitor C5 CAP,22µF,25V,±20%,SMD 1 - -
Capacitor C10 CAP,1µF,16V,±20%,SMD 1 - -
Table 2: Bill of Materials. Refer to Figure 2 for additional information.
P 2. 0/I CB/DAC0/A D03
1
P2.1/OCD/AD02
2
P0.0/CMP2/KBI0/AD01
3
P1.7/OCC/AD00
4
P1.6/OCB
5
P1.5/RST
6
VSS
7
P3.1/XTAL1
8
P3.0XTAL2/CLKOUT
9
P1.4/INT1
10
P1.3/INT0/SDA
11
P1.2/T0/SCL
12
P2.2/MOSI
13
P2.3/MISO
14
P2.4/SS
15
P2.5/SPICLK
16
P1.1/RXD
17
P1.0/TXD
18
P0.7/T1/KBI7
19
P0.6/CMP1/KBI6
20
VDD
21
P0.5/CMPREF/KBI5
22
P0.4/CIN1A/KBI4/DAC1/AD13
23
P0.3/CIN1B/KBI3/AD12
24
P0.2/CIN2A/KBI2/AD11
25
P0.1/CIN2B/KBI1/AD10
26
P2.6/OCA
27
P2.7/ICA
28
U2
LPC936
C4
0.1uF
VDD_5V
VDD
1
GND
2
SD
3
BP
4
VOUT
5
U1
LDO
C2
10nF
C1
10uF
VCC_3V
C3
10uF
VCC_3V
VIN
1
C1
2
C2
3
FLA SH
4
EN
5
RSET
6
RFB
7
SGND
8
PGND
9
VOUT
10
U3
IS31BL3231
C10
1uF
C6
0.1uF
C7
0.1uF
C8
10uF
C9
10uF
R16
91k
R17
NC
R18
0.22ohm
D10 D11
R15
91k
EN
FLASH FB
J1
DC CON
VDD_5V
C5
22UF
Vout
FLASH
EN
ke y 1
ke y 2
ke y 3
ke y 4
SW1
Fla sh lamp
SW2
torch
SW3
Bright+
SW4
Bright-
R6
10k
R7
10k
R8
10k
R9
10k
VCC_3V
key1
key2
key3
key4
R14
10k
R13
10k
D8
D7
D6
D5
D4
D3
D2
D1
R1
10k
R2
10k
R3
10k
R4
10k
R5
10k
R10
10k
R11
10k
R12
10k
LED1
LED2
LED3
LED4
LED5
LED6
LED7
LED8
P0.5_LED1
LED2
LED3
LED4
LED5
LED7
LED8
LED6
1
2
3
4
5
P1
ICP
GND
RST
P0.4
P0.5
VCC_3V
RST
P0.4
VCC_3V
P1-P3P4-P6

IS31BL3231-DLS2-EB

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