TLC5944 Datasheet, PDF (2/34 Pages) Texas Instruments – 16-Channel, 12-Bit PWM LED Driver with 6-Bit Dot Correction and Pre-Charge FET

TLC5944
SBVS112 – JUNE 2008 ...................................................................................................................................................................................................... www.ti.com
DESCRIPTION
The TLC5944 is a 16-channel, constant current sink driver. Each channel is individually adjustable with 4096
pulse-width modulated (PWM) steps and 64 constant sink current (dot correction) steps. The dot correction (DC)
adjusts for brightness variations between LEDs. Both grayscale (GS) control and DC are accessible via a
common serial interface port. The maximum current value of all 16 channels can be set by a single external
resistor.
The TLC5944 has an internal pre-charge FET to prevent the ghost-lighting phenomenon that occurs on
multiplexed LED systems. The TLC5944 has three error detection circuits for LED open detection (LOD), a
thermal error flag (TEF), and a pre-thermal warning (PTW). The LOD detects a broken or disconnected LED, and
a shorted LED to GND during the display period. The TEF indicates a too-high temperature condition; when the
TEF is set, all output drivers are turned off by the thermal shutdown (TSD) protection. Additionally, when the TEF
is cleared, all output drivers are restarted. The PTW indicates that the IC is operating in a high temperature
condition. The output drivers remain on when PTW is set.
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This integrated circuit can be damaged by ESD. Texas Instruments recommends that all integrated circuits be handled with
appropriate precautions. Failure to observe proper handling and installation procedures can cause damage.
ESD damage can range from subtle performance degradation to complete device failure. Precision integrated circuits may be more
susceptible to damage because very small parametric changes could cause the device not to meet its published specifications.
PACKAGE/ORDERING INFORMATION⁽¹⁾
PRODUCT
TLC5944
TLC5944
PACKAGE-LEAD
HTSSOP-28 PowerPAD™
5 mm × 5 mm QFN-32
ORDERING NUMBER
TLC5944PWPR
TLC5944PWP
TLC5944RHBR
TLC5944RHBT
TRANSPORT MEDIA,
QUANTITY
Tape and Reel, 2000
Tube, 50
Tape and Reel, 3000
Tape and Reel, 250
(1) For the most current package and ordering information see the Package Option Addendum at the end of this document, or see the TI
web site at www.ti.com.
ABSOLUTE MAXIMUM RATINGS⁽¹⁾⁽²⁾
Over operating free-air temperature range, unless otherwise noted.
V_CC
V_UP
I_OUT
V_IN
V_OUT
T_J(max)
T_STG
PARAMETER
Supply voltage, V_CC
Pre-charge voltage
Output current (dc)
XERR
OUT0 to OUT15
Input voltage range:
SIN, SCLK, XLAT, BLANK, GSCLK, DCSEL, IREF
Output voltage range
SOUT, XERR
OUT0 to OUT15
Operating junction temperature
Storage temperature range
ESD rating
Human body model (HBM)
Charged device model (CDM)
TLC5944
–0.3 to +6.0
–0.3 to +16
6
70
–0.3 to V_CC + 0.3
–0.3 to V_CC + 0.3
–0.3 to V_UP + 0.3
+150
–55 to +150
2
500
UNIT
V
V
mA
mA
V
V
V
°C
°C
kV
V
(1) Stresses above these ratings may cause permanent damage. Exposure to absolute maximum conditions for extended periods may
degrade device reliability. These are stress ratings only, and functional operation of the device at these or any other conditions beyond
those specified is not supported.
(2) All voltage values are with respect to network ground terminal.
2
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