Datasheet

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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
TPL9202
8-CHANNEL RELAY DRIVER
WITH INTEGRATED 5-V LDO AND BROWN-OUT DETECTION
SLIS124D – JUNE 2006 – REVISED FEBRUARY 2008
The serial communications are 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 TPL9202.
The NCS signal enables the SCLK and MOSI data when it is low. After NCS is set to 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 to transfer the serial data to the control register. SCLK must be held low when NCS is high.
Figure 1. Serial Communications
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Product Folder Link(s): TPL9202