TLC5922 Datasheet, PDF (1/16 Pages) Texas Instruments – LED DRIVER

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LED DRIVER
TLC5922
SLVS486 – SEPTEMBER 2003
FEATURES
• 16 Channels
• Drive Capability
– 0 to 80 mA (Constant-Current Sink) x 16 ch
• Constant Current Accuracy
– ±1% (typ)
• 1 Port of Serial Data Input/Output
• Fast Switching Output: T_r / T_f = 10ns (typ)
• CMOS Input/Output
• 30 MHz Data Transfer Rate
• Vcc = 3 V to 5.5 V
• Operating Temperature = -20°C to 85 °C
• LED Supply Voltage up to 17 V
• 32-pin HTSSOP (PowerPAD^TM) Package
• Dot Correction
– 128-Step For Each Individual 16 ch
• Controlled In-Rush Current
• Error Information
– LOD: LED Open Detection
– TEF: Thermal Error Flag
DESCRIPTION
The TLC5922 is a constant-current sink driver with 128
steps of adjustable current value (dot-correction). Each
of the 16 channels has an individually controlled
dot-correction and an ON/OFF state. Both the ON/OFF
and dot-correction have their respective modes set via
1 port of serial I/F. The maximum current value of the
constant-current output of all 16 channels is pro-
grammed by a single external resistor. An external
processor programs each of the 16 channels of the
TLC5922 with the desired ON/OFF state and
dot-correction value through a single serial interface.
After all data is loaded, the processor then latches the
information into the TLC5922 and enables the outputs.
The TLC5922 includes two error flags. First is the LED
open detection (LOD) which indicates a broken LED at
an output terminal. The second is a thermal error flag
(TEF) which indicates an over temperature condition.
The TLC5922 has two methods to communicate these
error flags to the external processor. One method is on
a dedicated output pin, XDOWN. The other method is
through the serial data output pin, SOUT.
APPLICATIONS
• LED Display
• LED Signboard
FUNCTIONAL BLOCK DIAGRAM
VCC
SIN
SCLK
0
1
DQ
FF
1
0
DQ
FF
DQ
FF
DQ
FF
DQ
FF
DQ
FF
0
1
SOUT
DQ DQ
DQ
DQ
DQ
LAT
LAT
LAT
LAT
LAT
XLAT
1
0
DQ
LAT
BLANK
SW0
DC15[6]
DC0[1]
DC0[0]
BLANK
SW1
SW15
16
16[output] Constant
Current Driver
with Dot Correction
XDOWN
IREF
GND
OUT0
OUT15
PGND
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas Instruments
semiconductor products and disclaimers thereto appears at the end of this data sheet.
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of Texas Instruments
standard warranty. Production processing does not necessarily in-
clude testing of all parameters.
Copyright © 2003, Texas Instruments Incorporated