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PDF LED1642GW Data sheet ( Hoja de datos )

Número de pieza LED1642GW
Descripción 16-channel LED driver
Fabricantes STMicroelectronics 
Logotipo STMicroelectronics Logotipo



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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

1 page




LED1642GW pdf
LED1642GW
List of figures
List of figures
Figure 1.
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Figure 22.
Figure 23.
Figure 24.
Figure 25.
Figure 26.
Figure 27.
Figure 28.
Figure 29.
Figure 30.
Figure 31.
TSSOP24, TSSOP24EP, QSOP-24 pinout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
QFN-24 pinout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Typical chip-to-chip accuracy . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Typical application schematic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Timing for clock, serial in, serial out, latch enable and outputs. . . . . . . . . . . . . . . . . . . . . . 14
LED1642GW simplified block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Input and output equivalent circuits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Digital keys . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Channel data and write switch . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Channel current vs. gain register value . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
Error detection action sequence . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
Error detection power-on timing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
Configuration register reading sequence . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
Configuration register reading sequence (zoom) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
Configuration register reading sequence - SDO delay actives . . . . . . . . . . . . . . . . . . . . . . 23
Configuration register reading sequence - SDO delay actives (zoom) . . . . . . . . . . . . . . . . 23
Output TON (current rise time) CFG -12 = CFG - 11 = 0 . . . . . . . . . . . . . . . . . . . . . . . . . . 25
Output TOFF (current fall time) CFG - 2 = CFG - 11 = 0 . . . . . . . . . . . . . . . . . . . . . . . . . . 25
Output TON (current rise time) CFG -12 = CFG - 11 = 1 . . . . . . . . . . . . . . . . . . . . . . . . . . 25
Output TOFF (current fall time) CFG -12 = CFG - 11 = 1 . . . . . . . . . . . . . . . . . . . . . . . . . . 25
SDO delay . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
Gradual output delay . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
PWCLK counter and comparator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
Brightness register setting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
Thermal flag status . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
Typical channel dropout voltage vs. output current (VDD = 3.3 V). . . . . . . . . . . . . . . . . . . 30
QSOP-24 package outline . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
QFN-24 package outline . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
TSSOP24 package outline . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
TSSOP24 exposed pad outline . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
TSSOP24 and TSSOP24 exposed pad tape and reel outline . . . . . . . . . . . . . . . . . . . . . . 39
DocID024395 Rev 6
5/42
42

5 Page





LED1642GW arduino
LED1642GW
Electrical characteristics
Figure 4. Typical application schematic
LED common rail voltage
+ Cled
…..
Supply voltage
Cin
VDD
OUT0 OUT1
OUT15
R-EXT
Current setting
resistor
LED1642GW
GND
SDI
CLK
LE
PWCLK
SDO
Data loaded
through serial
interface
Data output
AM13689V1
DocID024395 Rev 6
11/42
42

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