EQUIVALENT OF EACH INPUT

TYPICAL OF ALL DRAIN OUTPUTS

VCC

Input

GND

GND

DRAIN

33 V

20 V

25 V

12 V

TPIC6C596

SLIS093D – MARCH 2000 – REVISED MARCH 2015

www.ti.com

9 Application and Implementation

NOTE

Information in the following applications sections is not part of the TI component

specification, and TI does not warrant its accuracy or completeness. TI’s customers are

responsible for determining suitability of components for their purposes. Customers should

validate and test their design implementation to confirm system functionality.

9.1 Application Information

The TPIC6C596 device is a serial-in parallel-out, Power+LogicE 8-bit shift register with low-side switch DMOS

outputs rating of a 100 mA per channel. The device is designed to drive resistive and inductive loads and is

particularly well-suited as an interface between a microcontroller and LEDs or lamps. The TPIC6C596 device is

an enhancement of the TPIC6C595 device, where the shift register serial output (SER OUT) is clocked on the

falling edge of the serial clock to provide additional hold-time in applications where several devices are

cascaded.

9.1.1 Cascaded Application

The serial output (SEROUT) clocks out of the device on the falling edge of SRCK to provide additional hold time

for cascaded applications. Connect the device (SEROUT) pin to the next device (SERIN) for daisy Chain. This

provides improved performance for applications where clock signals may be skewed, devices are not located

near one another, or the system must tolerate electromagnetic interference.

Figure 13. Schematic of Inputs and Outputs

9.2 Typical Application

The typical application of TPIC6C596 device is an automotive cluster driver. In this example, two TPIC6C596

power shift registers are cascaded and used to turn on LEDs in the cluster panel. In this case, the LED must be

updated after all 16 bits of data have been loaded into the serial shift registers. The MCU outputs the data to the

serial input (SER IN) while clocking the shift register clock (SRCK). After the 16th clock, a pulse to the register

clock (RCK) transfers the data to the storage registers. If output enable (G) is low, then the LEDs are turned on

corresponding to the status word with ones being on and zeros off. With this simple scheme, MCU can use the

SPI interface to turn on 16 LEDs using only two ICs as illustrated in Figure 14.

14

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