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Serial Communications Interface

IN1

LSB

IN7

IN6

IN5

IN4

IN3

IN2

IN8

MSB

XXX

T1

T5

T8

T2

T4

T3

T1

NCS

SCLK

MOSI

1

2

3

4

5

6

7

8

T7

T6

TPL9201

8-CHANNEL RELAY DRIVER

WITH INTEGRATED 5-V LDO AND ZERO-VOLT DETECTION

SLIS123D – JUNE 2006 – REVISED FEBRUARY 2008

The serial communications is an 8-bit format, with data transfer synchronized using a serial clock from the

microcontroller (see Figure 1). A single register controls all the outputs. The signal gives the instruction to control

the output of TPL9201.

The NCS signal enables the SCLK and MOSI data when it is low. After NCS is set low for T1, synchronization

clock and data begin to transmit and, after the 8-bit data has been transmitted, NCS is set high again to disable

SCLK and MOSI and transfer the serial data to the control register. SCLK must be held low when NCS is in the

high state.

Figure 1. Serial Communications

8

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