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SERIAL COMMUNICATIONS INTERFACE

T0054-01

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

TPIC9201N

SLIS115 – JULY 2005

To operate the output in a PWM mode the output control register has to be updated at a rate 2X the desired

PWM frequency of the output. Maximum PWM frequency is 5 kHz. The register is updated every 100 ms.

The serial communications will be an 8-bit format; with data transfer synchronized using a serial clock from the

microcontroller. A single register controls all the outputs. The signal gives the instruction to control the output of

TPIC9201N.

clock and data begin to transmit and after the 8-bit data has been transmitted, NCS will be set to 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.

6