Overview
The ALED1642GWXTTR is a monolithic, low voltage, low current power 16-bit shift register designed by STMicroelectronics for LED panel displays. This device is particularly suited for automotive and other high-reliability applications due to its AECQ100 qualification. It features 16 constant current output channels, each capable of driving LEDs with a current range from 3 mA to 40 mA. The output current is programmable through an external resistor and can be adjusted using a 7-bit global current gain register in two subranges. Additionally, the brightness of each channel can be controlled separately through 12/16-bit PWM grayscale control.
The device includes several advanced features such as programmable turn-on and turn-off times, error detection for open and shorted LEDs, and auto power-saving/auto-wakeup capabilities. Thermal management is also integrated, with overtemperature alerts and output thermal shutdown at 170 °C. The high clock frequency of up to 30 MHz makes it suitable for high data rate transmission.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Supply Voltage | 3 to 5.5 | V |
| Output Current | 3 mA to 40 mA | mA |
| Output Voltage | -0.5 to 20 | V |
| Operating Temperature | -40 to 150 | °C |
| Thermal Shutdown | 170 | °C |
| Clock Frequency | Up to 30 MHz | MHz |
| Package | TSSOP24 (exposed pad) |
Key Features
- AECQ100 qualification for automotive applications
- 16 constant current output channels
- Output current programmable through external resistor (3 mA to 40 mA)
- 7-bit global current gain adjustment in two ranges
- 12/16-bit PWM grayscale brightness control
- Programmable output turn-on/off time
- Error detection mode (open and shorted-LED)
- Programmable shorted-LED detection thresholds
- Auto power saving/auto-wakeup features
- Selectable SDO synchronization on the CLK falling edge
- Gradual output delay (selectable)
- Thermal shutdown and overtemperature alert
Applications
- Full color/monochrome displays
- Dashboard backlighting and LED indicators
- Automotive interior lighting
Q & A
- What is the ALED1642GWXTTR used for?
The ALED1642GWXTTR is used for driving LED panel displays, particularly in automotive and high-reliability applications.
- What is the output current range of the ALED1642GWXTTR?
The output current range is from 3 mA to 40 mA.
- How is the output current programmed?
The output current is programmed through an external resistor and can be adjusted using a 7-bit global current gain register.
- What is the significance of the 12/16-bit PWM grayscale control?
The 12/16-bit PWM grayscale control allows for separate brightness adjustment of each channel.
- Does the ALED1642GWXTTR have error detection capabilities?
- What is the thermal shutdown temperature of the ALED1642GWXTTR?
The thermal shutdown temperature is 170 °C.
- What is the maximum clock frequency of the ALED1642GWXTTR?
The maximum clock frequency is up to 30 MHz.
- What package type is the ALED1642GWXTTR available in?
The device is available in a TSSOP24 (exposed pad) package.
- Does the ALED1642GWXTTR support auto power-saving features?
- What is the operating temperature range of the ALED1642GWXTTR?
The operating temperature range is from -40 °C to 150 °C.
