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STMicroelectronics Electronic Components Datasheet

LED1642GW Datasheet

16-channel LED driver

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LED1642GW
16 channel LED driver with error detection current gain control and
12/16-bit PWM brightness control
Datasheet - production data
QSOP-24
TSSOP24
TSSOP24
(exposed pad)
Features
16 constant current output channels
Output current: from 3 mA to 40 mA
Current programmable through external
resistor
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 (both open and shorted-
LED)
Programmable shorted-LED detection
thresholds
Auto power saving/auto-wakeup
Selectable SDO synchronization on the CLK
falling edge
Gradual output delay (selectable)
Supply voltage: 3 V to 5.5 V
Thermal shutdown and overtemperature alert
30 MHz 4-wires interface
20 V current generator rated voltage
Applications
Full color/monochrome large displays
LED signage
Description
The LED1642GW is a monolithic, low voltage, low
current power 16-bit shift register designed for
LED panel displays. The LED1642GW
guarantees 20 V output driving capability allowing
the user to connect several LEDs in series. In the
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
by a 7-bit current gain register in two subranges.
The brightness can be adjusted separately for
each channel through 12/16-bit grayscale control.
Programmable turn-on and turn-off time (four
different values available) improves the low noise
generation performance of the system.
Open/short error detection mode is available in
the LED1642GW. The auto power-shutdown and
auto power-on features (selectable) allow the
device to save power without external
intervention.
Thermal management includes an
overtemperature data alert and output thermal
shutdown (170 °C). The high clock frequency is
up to 30 MHz and it makes the device suitable for
high data rate transmission. A selectable gradual
output delay reduces the inrush current, whereas
the selectable SDO synchronization feature works
when the device is used in daisy-chain
configuration. The supply voltage range is
between 3 V and 5.5 V.
November 2015
This is information on a product in full production.
DocID024395 Rev 6
1/42
www.st.com


STMicroelectronics Electronic Components Datasheet

LED1642GW Datasheet

16-channel LED driver

No Preview Available !

Contents
Contents
LED1642GW
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 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
8 Configuration register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
8.1 Gain control (from CFG 0 to 5) and current ranges (CFG- 6) . . . . . . . . . 19
8.2 Error detection mode (CFG-7) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
8.3 Error detection conditions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
8.4 Auto-wakeup/auto power shutdown (CFG-10) . . . . . . . . . . . . . . . . . . . . . 24
8.5 Programmable turn-on/turn-off time (CFG-11/12) . . . . . . . . . . . . . . . . . . 24
8.6 SDO delay (CFG-13) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
8.7 Gradual output delay (CFG-14) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
8.8 PWM counter setting and brightness register (CFG-15) . . . . . . . . . . . . . 27
9 Thermal flag . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
10 Dropout voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
2/42 DocID024395 Rev 6


Part Number LED1642GW
Description 16-channel LED driver
Maker STMicroelectronics
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LED1642GW Datasheet PDF






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