ALED1642GWXTTR STMicroelectronics

ALED1642GW 16 channel LED driver with error detection, current gain control and 12/16-bit PWM brightness control for automotive applications Datasheet - production data Description The ALED1642GW is a monolithic, low voltage, low current power 16-bit shift register designed for LED panel displays. The ALED1642GW guarantees 20 V output driving capability allowing TSSOP24 the user to connect several LEDs in series. In the (exposed pad) output stage, sixteen regulated current sources provide from 3 mA to 40 mA constant current to drive the LEDs. The current is programmed through an external resistor and can be adjusted Features by a 7-bit current gain register in two subranges. The brightness can be adjusted separately for AECQ100 qualification each channel through 12/16-bit grayscale control. 16 constant current output channels Programmable turn-on and turn-off time (four Output current: from 3 mA to 40 mA different values available) improves the low noise generation performance of the system. Current programmable through external resistor Open/short error detection mode is available in 7-bit global current gain adjustment in two the ALED1642GW. The auto power-shutdown ranges and auto power-on features (selectable) allow the device to save power without external 12/16-bit PWM grayscale brightness control intervention. Programmable output turn-on/off time Thermal management includes an Error detection mode (both open and shorted- overtemperature data alert and output thermal LED) shutdown (170 C). The high clock frequency is Programmable shorted-LED detection up to 30 MHz and it makes the device suitable for thresholds high data rate transmission. A selectable gradual output delay reduces the inrush current, whereas Auto power saving/auto-wakeup the selectable SDO synchronization feature works Selectable SDO synchronization on the CLK when the device is used in daisy-chain falling edge configuration. The supply voltage range is Gradual output delay (selectable) between 3 V and 5.5 V. Supply voltage: 3 V to 5.5 V Thermal shutdown and overtemperature alert Up to 30 MHz 4-wires interface 20 V current generator rated voltage Applications Full color/monochrome displays Dashboard (backlighting led indicators) Automotive Interior lighting November 2015 DocID025718 Rev 4 1/39 This is information on a product in full production. www.st.comContents ALED1642GW Contents 1 Pin description 6 2 Absolute maximum ratings 7 3 Thermal characteristics .8 4 Electrical characteristics 8 5 Switching characteristics 12 6 Simplified internal block diagram 15 6.1 Equivalent circuits of inputs and outputs 15 7 Digital blocks 17 8 Configuration register .19 8.1 Gain control (from CFG 0 to 5) and current ranges (CFG- 6) 20 8.2 Error detection mode (CFG-7) . 22 8.3 Error detection conditions . 25 8.4 Auto-wakeup/auto power shutdown (CFG-10) . 25 8.5 Programmable turn-on/turn-off time (CFG-11/12) . 25 8.6 SDO delay (CFG-13) . 27 8.7 Gradual output delay (CFG-14) . 27 8.8 PWM counter setting and brightness register (CFG-15) 28 9 Thermal flag .30 10 Dropout voltage 31 2/39 DocID025718 Rev 4