IS31FL3218 Datasheet, PDF (1/13 Pages) Integrated Silicon Solution, Inc – 18 CHANNELS LED DRIVER

IS31FL3218
18 CHANNELS LED DRIVER
April 2012
GENERAL DESCRIPTION
IS31FL3218 is comprised of 18 constant current
channels each with independent PWM control,
designed for driving LEDs. The output current of each
channel can be set at up to 38mA (Max.) by an external
resistor. The average LED current of each channel can
be changed in 256 steps by changing the PWM duty
cycle through an I2C interface.
The chip can be turned off by pulling the SDB pin low or
by using the software shutdown feature to reduce
power consumption. The slave address is fixed “1010
1000”.
IS31FL3218 is available in QFN-24 (4mm × 4mm) and
SOP-24. It operates from 2.7V to 5.5V over the
temperature range of -40°C to +85°C.
FEATURES
 2.7V to 5.5V supply
 I2C interface, automatic address increment
function
 Internal reset register
 Modulate LED brightness with 256 steps PWM
 Each channel can be controlled independently
 -40°C to +85°C temperature range
 QFN-24 (4mm × 4mm), SOP-24 package
APPLICATIONS
 Mobile phones and other hand-held devices for
LED display
 LED in home appliances
TYPICAL APPLICATION CIRCUIT
VBattery
Micro
Controller
VBattery
7
3
OUT1
VCC
8
OUT2
1F
0.1 F
9
OUT3
10
OUT4
11
OUT5
VDD
12
OUT6
13
4.7k 4.7k
OUT7
IS31FL3218 ^{OUT8 14}
5
15
SDA
OUT9
6
16
SCL
OUT10
24
17
SDB
OUT11
18
100k
OUT12
19
OUT13
20
OUT14
21
2
OUT15
R_EXT
22
OUT16
3.3k
4
23
OUT17
GND
1
OUT18
Figure 1 Typical Application Circuit
Note: The maximum output current is set up to 23mA when REXT = 3.3kΩ. The maximum output current can be set by external resistor, REXT.
Please refer to the detail information in Page 9.
Note: The IC should be placed far away from the mobile antenna in order to prevent the EMI.
Integrated Silicon Solution, Inc. – www.issi.com
1
Rev.B, 03/28/2012