LP3943_15 Datasheet, PDF (1/25 Pages) Texas Instruments – RGB, White, Blue 16-LED Fun Light Driver

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LP3943
SNVS256C – NOVMEBER 2003 – REVISED OCTOBER 2015
LP3943 RGB, White, Blue 16-LED Fun Light Driver
1 Features
•1 Internal Power-On Reset
• Active Low Reset
• Internal Precision Oscillator
• Variable Dim Rates
(From 6.25 ms to 1.6 s; 160 Hz to 0.625 Hz)
• 16 LED Drivers (Multiple Programmable States:
ON, OFF, Input, and Dimming at a Specified
Rate)
• 16 Open-Drain Outputs Capable of Driving up to
25 mA per LED
2 Applications
• Customized Flashing LED Lights for Cellular
Phones
• Portable Applications
• Digital Cameras
• Indicator Lamps
• General Purpose I/O Expander
• Toys
3 Description
The LP3943 is an integrated device capable of
independently driving 16 LEDs. This device also
contains an internal precision oscillator that provides
all the necessary timing required for driving each
LED. Two prescaler registers, along with two PWM
registers, provide a versatile duty-cycle control. The
LP3943 contains the ability to dim LEDs in
SMBUS/I²C applications where it is required, to cut
down on bus traffic.
Traditionally, dimming LEDs using a serial shift
register such as 74LS594/5 requires a large amount
of traffic on the serial bus. The LP3943 instead
requires only the setup of the frequency and duty
cycle for each output pin; from then on, only a single
command from the host is required to turn each
individual open drain output to an ON or OFF state,
or to cycle a programmed frequency and duty cycle.
Maximum output sink current is 25 mA per pin and
200 mA per package. Any ports not used for
controlling the LEDs can be used for general purpose
input/output expansion.
Device Information⁽¹⁾
PART NUMBER
PACKAGE
BODY SIZE (NOM)
LP3943
WQFN (24)
4.00 mm × 4.00 mm
(1) For all available packages, see the orderable addendum at
the end of the data sheet.
Typical Application Circuit
+5V
5V
2
SMBUS/I C
RGB
SDA
SCL
PORTx.D
Cell Phone Baseband
Controller/PController
VDD
SDA
SCL
RESET
LED15
LED14
LED13
LED12
LED11
LED10
LED9
LED8
A2
A1
A0
GND
LED7
LED6
LED5
LED4
LED3
LED2
LED1
LED0
+5V
Blue LEDs
+5V
White LEDs
1
An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,
intellectual property matters and other important disclaimers. PRODUCTION DATA.