Overview
The ALED1262ZTTR is a monolithic 12-output LED driver designed by STMicroelectronics for automotive exterior and interior lighting applications. This device ensures a 19 V output driving capability, allowing users to connect several LEDs in series. It features twelve regulated current sources that provide constant current from 6 mA to 60 mA, programmable by a single external resistor. The ALED1262ZTTR also includes LED open error detection and 7-bit PWM local brightness control for each channel. The device supports both bus-driven mode (BDM) using the I²C interface and standalone mode (SAM) using internal custom configuration by OTP.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Supply Voltage (VDDA) | 5.5 to 38 | V |
| Output Voltage (VOUT) | Up to 19 | V |
| Output Current Range | 6 mA to 60 mA | mA |
| Current Programming | Single external resistor | |
| I²C Clock Frequency | Up to 400 kHz | kHz |
| Operating Temperature Range | -40 to +150 | °C |
| Thermal Shutdown | 170 °C | °C |
| Package | HTSSOP24 |
Key Features
- Designed for automotive applications
- 12 constant current output channels
- 19 V current generator rated voltage
- Output current programmable by a single external resistor (6 mA to 60 mA)
- 7-bit PWM local brightness control for each channel
- Slow turn-on/off time, gradual output delay, and dithered clock for EMI reduction
- Error detection for open LEDs
- Supply voltage range from 5.5 V to 38 V
- Thermal shutdown and overtemperature alert
- Standalone and bus-driven mode operations
- Custom configuration by OTP with redundancy and ECC
- 400 kHz fast I²C interface with selectable extended Hamming encoding
- Wired-OR error flag connection
Applications
- Automotive rear lights
- Automotive interior lighting
Q & A
- What is the primary application of the ALED1262ZTTR?
The ALED1262ZTTR is primarily designed for automotive exterior and interior lighting applications.
- How many output channels does the ALED1262ZTTR have?
The device has 12 constant current output channels.
- What is the range of output current provided by the ALED1262ZTTR?
The output current ranges from 6 mA to 60 mA.
- How is the output current programmed in the ALED1262ZTTR?
The output current is programmed by a single external resistor.
- What is the maximum I²C clock frequency supported by the ALED1262ZTTR?
The device supports an I²C clock frequency of up to 400 kHz.
- What are the thermal management features of the ALED1262ZTTR?
The device features thermal shutdown at 170 °C and overtemperature alert.
- Can the ALED1262ZTTR operate in standalone mode?
Yes, the device can operate in both bus-driven mode (BDM) and standalone mode (SAM) using internal custom configuration by OTP.
- What is the purpose of the GPWM pin in the ALED1262ZTTR?
The GPWM pin allows for global PWM dimming, enabling the brightness of all channels to be adjusted simultaneously.
- How does the ALED1262ZTTR reduce EMI noise?
The device reduces EMI noise through slow turn-on/off times, gradual output delay, and internal clock dithering for spread spectrum noise reduction.
- What is the package type of the ALED1262ZTTR?
The device is packaged in an HTSSOP24 package.
