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ALED1262ZT Datasheet

Automotive-grade 12-channel LED driver

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ALED1262ZT
Datasheet
Automotive-grade 12-channel LED driver with open detection, local dimming, bus
driven and standalone operations
HTSSOP24 exposed pad
Features
• Designed for automotive applications
• 12 constant current output channels
• 19 V current generator rated voltage
• Output current: from 6 mA to 60 mA
• Current programmable by a single external resistor
• 7-bit PWM local brightness control
• Slow turn-on/off time, gradual output delay and dithered clock for EMI reduction
• Error detection for open LEDs
• Supply voltage: from 5.5 V to 38 V
• Thermal shutdown and overtemperature alert
• Standalone and bus-driven mode
• 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
Maturity status link
ALED1262ZT
Device summary
Order code
ALED1262ZT
ALED1262ZTTR
Package HTSSOP24 exposed pad
Packing
62 parts per tube
2500 parts per reel
Description
The ALED1262ZT is a monolithic 12 output LED driver designed for automotive
exterior and interior lighting applications. The ALED1262ZT guarantees 19 V output
driving capability allowing users to connect several LEDs in series. In the output
stage, twelve regulated current sources provide from 6 mA to 60 mA constant current
to drive LEDs. The current is programmed by a single external resistor. In the
ALED1262ZT, LED open error detection is available.
The brightness can be adjusted separately for each channel through a 7-bit
grayscale control. A slow turn-on and turn-off time improves the system low noise
generation performance. Moreover the gradual output delay reduces the inrush
current. To further increase EMI performance, this device implements an internal
clock dithering to have a spread spectrum noise reduction.
Thermal management is equipped with overtemperature data alert and the output
thermal shutdown (170 °C). The I²C high clock frequency, up to 400 kHz, makes the
device suitable for high data rate transmissions. The supply voltage range is between
5.5 V and 38 V avoiding any external pre-regulation or additional load dump
protection on the power supply stage.
This device can operate in bus-driven mode (BDM) using I²C interface or in
standalone mode (SAM) using internal custom configuration by OTP.
DS12631 - Rev 4 - February 2019
For further information contact your local STMicroelectronics sales office.
www.st.com


STMicroelectronics Electronic Components Datasheet

ALED1262ZT Datasheet

Automotive-grade 12-channel LED driver

No Preview Available !

1
Pin description
Figure 1. HTSSOP24 pinout
ALED1262ZT
Pin description
Table 1. Pin description
HTSSOP24
Symbol
Name and function
1
VDDD
Digital supply terminal
2
SDA
I²C serial data input terminal
3
SCL
I²C clock input terminal
4
VDDA
Analog supply terminal and internal LDO input
5
LDO3
3.3 V internal LDO output
6
R-EXT
Terminal for external resistor for constant current programming
7
GND
Ground terminal
8
FLG
Fault flag: open-drain PMOS output for wired-OR connection
9
GPWM
Global PWM control. To be connected to LDO3 if it is not used
10
PG
Power Good pin. Connect to an external resistor divider to set a proper power supply
voltage threshold for detection enabling
11
OTP1/2
Digital input for internal OTP register selection
12
CS
Chip-select and power supply (15 V) for OTP burning
13 to 24 OUT0 to OUT11 Output terminals (low-side current generators)
Exposed pad(1)
-
Additional device ground terminal to be connected to pin 7 (GND)
1. The device exposed pad must be connected to GND, moreover it should be soldered directly to a PCB copper area to
maximize thermal dissipation.
DS12631 - Rev 4
page 2/69


Part Number ALED1262ZT
Description Automotive-grade 12-channel LED driver
Maker STMicroelectronics
Total Page 3 Pages
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