Overview
The LP3943ISQ/NOPB, produced by Texas Instruments, is a versatile 16-channel RGB and white LED driver designed for independent string control via SMBUS/I2C interface. This integrated device is capable of driving 16 LEDs with multiple programmable states, including ON, OFF, and dimming at specified rates. It features an internal precision oscillator, which provides the necessary timing for LED control, and includes two prescaler registers and two PWM registers for duty-cycle control. The LP3943 is particularly suited for applications requiring dynamic LED control with minimal bus traffic, making it ideal for use in cellular phones, digital cameras, portable devices, and other consumer electronics.
Key Specifications
| Parameter | Value |
|---|---|
| Package | 24-WFQFN Exposed Pad |
| Pins | 24 |
| Operating Temperature Range | -40°C to 85°C |
| Supply Voltage | 2.3V to 5.5V |
| Output Current per LED | Up to 25mA |
| Total Package Current | Up to 200mA |
| I2C Clock Frequency | Up to 400kHz |
| Dimming Frequency Range | 0.625Hz to 160Hz |
| Dimming Duty Cycle Control | 8-bit PWM (0% to 100%) |
| Lead Free Status / RoHS Status | Lead Free / RoHS Compliant |
| Moisture Sensitivity Level (MSL) | 1 (Unlimited) |
Key Features
- Internal power-on reset and active low reset
- Internal precision oscillator for timing control
- Variable dim rates from 6.25ms to 1.6s
- 16 LED drivers with multiple programmable states (ON, OFF, input, and dimming)
- 16 open-drain outputs capable of driving up to 25mA per LED
- Programmable internal PWM dimming with 8-bit duty cycle and frequency control
- Auto increment for I2C writes to reduce bus traffic
- Externally selectable I2C slave address via ADR0, ADR1, and ADR2 inputs
- General purpose input/output expansion for unused LED pins
Applications
- Customized flashing LED lights for cellular phones
- Portable applications
- Digital cameras
- Indicator lamps
- General purpose I/O expander
- Toys and other consumer electronics
- Camera flash
Q & A
- What is the LP3943ISQ/NOPB used for? The LP3943ISQ/NOPB is a 16-channel RGB and white LED driver used for independent string control via SMBUS/I2C interface.
- What is the operating voltage range of the LP3943ISQ/NOPB? The operating voltage range is from 2.3V to 5.5V.
- How many LEDs can the LP3943ISQ/NOPB drive? The LP3943ISQ/NOPB can drive up to 16 LEDs.
- What is the maximum output current per LED? The maximum output current per LED is up to 25mA.
- What is the total package current limit? The total package current limit is up to 200mA.
- What communication interfaces does the LP3943ISQ/NOPB support? The LP3943ISQ/NOPB supports SMBUS and I2C interfaces.
- What is the dimming frequency range of the LP3943ISQ/NOPB? The dimming frequency range is from 0.625Hz to 160Hz.
- Can the LP3943ISQ/NOPB be used for general purpose I/O expansion? Yes, unused LED pins can be used for general purpose input/output expansion.
- Is the LP3943ISQ/NOPB RoHS compliant? Yes, the LP3943ISQ/NOPB is lead free and RoHS compliant.
- What is the moisture sensitivity level (MSL) of the LP3943ISQ/NOPB? The MSL is 1 (Unlimited).
