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See Technical Specifications

LP3943ISQ/NOPB

LED Driver IC 16 Output Power Switch Shift Register I2C, SMBus Dimming 25mA 24-WQFN (4x4)

Manufacturer:

TI
Mfr.Part #:

LP3943ISQ/NOPB
Datasheet:

LP3943ISQ/NOPB Datasheet (PDF)
Pbfree Code:

Yes
Part Life Cycle Code:

Active
Reach Compliance Code:

compliant
ECCN Code:

EAR99
EDA/CAD Models:

Request Free CAD Models for LP3943ISQ/NOPB

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LP3943ISQ/NOPB General 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.

For all available packages, see the orderable addendum at the end of the data sheet.

Key Features

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

Specifications

Source Content uid	LP3943ISQ/NOPB	Pbfree Code	Yes
Part Life Cycle Code	Active	Reach Compliance Code	compliant
ECCN Code	EAR99	HTS Code	8542.39.00.01
Data Input Mode	SERIAL	Input Characteristics	STANDARD
Interface IC Type	LED DISPLAY DRIVER	JESD-30 Code	S-PQCC-N24
Moisture Sensitivity Level	1	Multiplexed Display Capability	NO
Number of Channels	16	Number of Functions	1
Number of Segments	16	Number of Terminals	24
Output Characteristics	OPEN-DRAIN	Peak Reflow Temperature (Cel)	260
Surface Mount	YES	Temperature Grade	INDUSTRIAL
Terminal Finish	MATTE TIN	Terminal Form	NO LEAD
Terminal Position	QUAD	Time@Peak Reflow Temperature-Max (s)	30