Overview
The LED1642GW, produced by STMicroelectronics, is a monolithic, low voltage, low current power 16-bit shift register designed specifically for LED panel displays. This device guarantees a 20 V output driving capability, allowing users to connect several LEDs in series. It features sixteen regulated current sources that provide a constant current ranging from 3 mA to 40 mA to drive the LEDs. The current can be programmed through an external resistor and adjusted by a 7-bit current gain register in two subranges. Additionally, the brightness of each channel can be adjusted separately through 12/16-bit grayscale control.
Key Specifications
| Specification | Value |
|---|---|
| Number of Channels | 16 |
| Output Current Range | 3 mA to 40 mA |
| Current Programming | Through external resistor and 7-bit current gain register |
| Brightness Control | 12/16-bit PWM grayscale |
| Output Turn-On/Off Time | Programmable (four different values) |
| Error Detection | Open and shorted-LED detection |
| Supply Voltage Range | 3 V to 5.5 V |
| Thermal Shutdown | 170 °C |
| Clock Frequency | Up to 30 MHz |
| Package Options | QSOP-24, QFN-24L, TSSOP 24, HTSSOP24 |
Key Features
- 16 constant current output channels
- Output current programmable through external resistor and 7-bit global current gain adjustment
- 12/16-bit PWM grayscale brightness control for each channel
- Programmable output turn-on and turn-off time to reduce noise
- Error detection mode for open and shorted LEDs with programmable detection thresholds
- Auto power saving and auto-wakeup features
- Selectable SDO synchronization on the CLK falling edge
- Gradual output delay to reduce inrush current
- Thermal management with overtemperature alert and output thermal shutdown
- High clock frequency up to 30 MHz for high data rate transmission
Applications
The LED1642GW is suitable for various applications, including full color and monochrome large displays, LED signage, and other LED panel display systems. Its features make it ideal for scenarios where precise brightness control, error detection, and power management are crucial.
Q & A
- What is the primary function of the LED1642GW?
The LED1642GW is a 16-bit shift register designed to drive LED panel displays, providing constant current to each LED channel. - What is the output current range of the LED1642GW?
The output current range is from 3 mA to 40 mA. - How is the current programmed in the LED1642GW?
The current is programmed through an external resistor and can be adjusted by a 7-bit current gain register. - What is the brightness control capability of the LED1642GW?
The brightness can be adjusted separately for each channel through 12/16-bit PWM grayscale control. - Does the LED1642GW have error detection features?
Yes, it includes open and shorted-LED detection with programmable detection thresholds. - What is the supply voltage range of the LED1642GW?
The supply voltage range is between 3 V and 5.5 V. - What is the thermal shutdown temperature of the LED1642GW?
The thermal shutdown temperature is 170 °C. - What is the maximum clock frequency of the LED1642GW?
The maximum clock frequency is up to 30 MHz. - What package options are available for the LED1642GW?
The available packages include QSOP-24, QFN-24L, TSSOP 24, and HTSSOP24. - What are some typical applications of the LED1642GW?
Typical applications include full color and monochrome large displays, LED signage, and other LED panel display systems.
