L9733 datasheet(20/35 Pages) STMICROELECTRONICS

20 / 35 page

Functional description

L9733

20/35

DocID11319 Rev 12

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) is enable the corresponding output no

matter what the status of the SPI command register is. 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 100 kΩ resistor connected from this pin to ground, which will pull

this pin to ground if an open circuit condition occurs. 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 kΩ resistor connected from this pin to VDD, which will

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

L9733 データシート(PDF) 20 Page - STMicroelectronics