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Número de pieza | LED1642GW | |
Descripción | 16-channel LED driver | |
Fabricantes | STMicroelectronics | |
Logotipo | ||
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No Preview Available ! 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
List of figures
List of figures
Figure 1.
Figure 2.
Figure 3.
Figure 4.
Figure 5.
Figure 6.
Figure 7.
Figure 8.
Figure 9.
Figure 10.
Figure 11.
Figure 12.
Figure 13.
Figure 14.
Figure 15.
Figure 16.
Figure 17.
Figure 18.
Figure 19.
Figure 20.
Figure 21.
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
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
11 Page |
Páginas | Total 30 Páginas | |
PDF Descargar | [ Datasheet LED1642GW.PDF ] |
Número de pieza | Descripción | Fabricantes |
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