L9733

Functional description

19/33

4.6

Discrete inputs

4.6.1

Output 6-8 Enable Input (In6, ln7, ln8)

This input allows Output 6 (or Output 7, or Output 8) to be enabled via this external pin

without the use of the SPI. The SPI command and the In6-7 input are logically or'd together.

A logic "1" on this input (In6, ln7 or ln8) will enable this output no matter what the status of

the SPI command register. A logic "0" on this input will disable this output if the SPI

command register is not commanding this output on. This pins (In6, ln7 or ln8) can be left

"open" if the internal output device is being controlled only via the SPI. This input has a

nominal 100k

Ω resistor connected from this pin to ground, which will pull this pin to ground if

an open circuit condition occur. This input is ideally suited for non-inductive loads that are

pulse width modulated (PWM'd). This allows PWM control without the use of the SPI inputs.

4.6.2

Reset Input (RES)

When this input goes low it resets all the internal registers and switches off all the output

stages. This input has a nominal 100 k

Ω resistor connected from this pin to VDD, which will

pull this pin to VDD if an open circuit condition occur.