TLC6C598 Datasheet, PDF (12/23 Pages) Texas Instruments – TLC6C598 8-Bit Shift-Register LED Driver

TLC6C598
SLIS177 – MAY 2016
www.ti.com
8.3 Feature Description
8.3.1 Thermal Shutdown
The device implements an internal thermal shutdown to protect itself if the junction temperature exceeds 175°C
(typical). The thermal shutdown forces the device to have an open state when the junction temperature exceeds
the thermal trip threshold. Once the junction temperature decreases below 160°C (typical), the device begins to
operate again.
8.3.2 Serial-In Interface
The TLC6C598 device contains an 8-bit serial-in, parallel-out shift register that feeds an 8-bit D-type storage
register. Data transfer through the shift and storage registers is on the rising edge of the shift register clock
(SRCK) and the register clock (RCK), respectively. The storage register transfers data to the output buffer when
shift-register clear (CLR) is high.
8.3.3 Clear Registers
A logic low on the CLR pin clears all registers in the device. TI suggests clearing the device during power up or
initialization.
8.3.4 Output Channels
DRAIN0–DRAIN7. These pins can survive up to 40-V LED supply voltage.
8.3.5 Register Clock
RCK is the storage-register clock. Data in the storage register appears at the output whenever the output enable
(G) input signal is high.
8.3.6 Cascade Through SER OUT
By connecting the SER OUT pin to the SER IN input of the next device on the serial bus in cascade, the data
transfers to the next device on the falling edge of SRCK. This connection can improve the cascade application
reliability, as it can avoid the issue that the second device receives SRCK and data input on the same rising
edge of SRCK.
8.3.7 Output Control
Holding the output enable (pin G) high holds all data in the output buffers low, and all drain outputs are off.
Holding G low makes data from the storage register transparent to the output buffers. When data in the output
buffers is low, the DMOS transistor outputs are off. When data is high, the DMOS transistor outputs are capable
of sinking current. This pin also can be used for global PWM dimming.
8.4 Device Functional Modes
8.4.1 Operation With V_CC < 3 V
This device works normally within the range 3 V ≤ V_CC ≤ 5.5 V. When the operating voltage is lower than 3 V,
correct behavior of the device, including communication interface and current capability, is not assured.
8.4.2 Operation With 5.5 V ≤ V_CC ≤ 8 V
The device works normally in this voltage range, but reliability issues may occur if the device works for a long
time in this voltage range.
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