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參數(shù)資料
| 型號： | TLC5941RHB |
| 廠商： | Texas Instruments, Inc. |
| 英文描述： | 16-CHANNEL LED DRIVER WITH DOT CORRECTION AND GRAYSCALE PWM CONTROL |
| 中文描述： | 16-CHANNEL的LED驅(qū)動器，帶有點校正與灰度PWM控制 |
| 文件頁數(shù)： | 11/23頁 |
| 文件大小： | 513K |
| 代理商： | TLC5941RHB |
www.ti.com
PRINCIPLES OF OPERATION
SERIAL INTERFACE
The TLC5941 includes a flexible serial interface, which can be connected to microcontrollers or digital signal
processors in various ways. Only 3 pins are needed to input data into the device. The rising edge of SCLK signal
shifts the data from the SIN pin to the internal register. After all data is clocked in, a rising edge of XLAT latches
the serial data to the internal registers. All data are clocked in with the MSB first. Multiple TLC5941 devices can
be cascaded by connecting the SOUT pin of one device with the SIN pin of the following device. The SOUT pin
can also be connected to the controller to receive status information from the TLC5941. The serial data format is
96-bit or 192-bit wide, depending on programming mode of the device.
SCLK
SOUT
SIN
MODE
Vcc
DC n
MSB
GS
MSB
X
1
1
XLAT
DC n
LSB
96
192
GS
LSB
193
DC n+1
MSB
DC n+1
MSB1
1
DC n
MSB
DC n
LSB
DC
MSB
GS
MSB
SID
MSB
X
2
t
h3
t
su3
t
h3
t
su2
t
h2
t
su2
t
h2
DC Mode Data
Input Cycle
GS Mode Data
Input Cycle
DC Mode Data
Input Cycle
X
ERROR INFORMATION OUTPUT
The open-drain output XERR is used to report both of the TLC5941 error flags, TEF and LOD. During normal
operating conditions, the internal transistor connected to the XERR pin is turned off. The voltage on XERR is
pulled up to V
CC
through an external pullup resistor. If TEF or LOD is detected, the internal transistor is turned
on, and XERR is pulled to GND. Because XERR is an open-drain output, multiple ICs can be ORed together and
pulled up to V
CC
with a single pullup resistor. This reduces the number of signals needed to report a system error
(see
Figure 13
TLC5941
SLVS589–JULY 2005
Figure 6. Serial Data Input Timing Chart
To differentiate LOD and TEF signal from XERR pin, LOD can be masked out with BLANK = HIGH.
Table 1. XERR Truth Table
ERROR CONDITION
ERROR INFORMATION
TEF
L
H
L
L
H
H
SIGNALS
TEMPERATURE
T
J
< T
(TEF)
T
J
> T
(TEF)
OUTn VOLTAGE
Don't Care
Don't Care
OUTn > V
(LED)
OUTn < V
(LED)
OUTn > V
(LED)
OUTn < V
(LED)
LOD
X
X
L
H
L
H
BLANK
XERR
H
L
H
L
L
L
H
T
J
< T
(TEF)
L
T
J
> T
(TEF)
11
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