Overview
The PCA9957HNMP, produced by NXP USA Inc., is a highly advanced 24-channel constant current LED driver. This device is optimized for dimming and blinking Red/Green/Blue/Amber (RGBA) LEDs and is controlled via a daisy-chain SPI-compatible 4-wire serial bus. It is designed to provide precise control over LED brightness and offers various features for sophisticated LED lighting applications.
Key Specifications
| Specification | Value |
|---|---|
| Number of LED Channels | 24 |
| LED Current per Channel | Up to 32 mA |
| Supply Voltage Range | 2.7 V to 5.5 V |
| LED Supply Voltage | Up to 5 V |
| Individual PWM Frequency | 31.25 kHz |
| Group PWM Frequency | 122 Hz (fixed), adjustable between 15 Hz to once every 16.8 seconds |
| PWM Resolution | 8-bit (256 steps) for both individual and group PWM |
| Output Peak Current Adjustment | 125 μA to 31.875 mA with REXT = 2 kΩ |
| Serial Bus Data Clock Frequency | Up to 10 MHz |
| Gradation Control Groups | 6 groups with programmable gradation time and rate |
Key Features
- Each LED output has its own 8-bit resolution (256 steps) fixed frequency individual PWM controller.
- An additional 8-bit resolution (256 steps) group PWM controller for dimming and blinking.
- Programmable LED output delay to reduce EMI and surge currents.
- Gradation control for all channels with programmable gradation time and rate.
- Built-in open, short load, and overtemperature detection circuitry.
- Thermal shutdown feature for device protection.
- Active LOW output enable input pin (OE) for external PWM control.
Applications
The PCA9957HNMP is suitable for a variety of LED lighting applications, including but not limited to:
- Automotive lighting systems.
- Industrial lighting control systems.
- Consumer electronics with advanced LED displays.
- Signage and advertising displays.
- Smart home lighting solutions.
Q & A
- What is the PCA9957HNMP used for? The PCA9957HNMP is a 24-channel constant current LED driver used for dimming and blinking RGBA LEDs.
- How is the PCA9957HNMP controlled? It is controlled via a daisy-chain SPI-compatible 4-wire serial bus.
- What is the supply voltage range of the PCA9957HNMP? The supply voltage range is from 2.7 V to 5.5 V.
- What is the maximum current per LED channel? The maximum current per LED channel is up to 32 mA.
- Does the PCA9957HNMP support gradation control? Yes, it supports gradation control with six programmable groups.
- What is the frequency of the individual PWM controller? The frequency of the individual PWM controller is 31.25 kHz.
- Can the output peak current be adjusted? Yes, the output peak current can be adjusted from 125 μA to 31.875 mA with REXT = 2 kΩ.
- Does the PCA9957HNMP have built-in protection features? Yes, it has built-in open, short load, and overtemperature detection circuitry, as well as a thermal shutdown feature.
- What is the purpose of the active LOW output enable input pin (OE)? The active LOW output enable input pin (OE) can be used to externally PWM the outputs.
- What is the maximum data clock frequency for the serial bus? The maximum data clock frequency for the serial bus is up to 10 MHz.
