L6460 datasheet(33/139 Pages) STMICROELECTRONICS

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L6460

Supervisory system

Doc ID 17713 Rev 1

33/139

state. This stretch time can be selected by setting the ID[1:0] bits in the SampleID register

according to following table.

When nRST_int becomes active (logic level = “0”) it sets in their reset state some of the

functions inside L6460. The main functions that will be reset by nRST_int signal are the

following:

–

Serial interface will be reset and will not accept any other command.

–

The bridges 1 and 2 will place their outputs in high impedance and PWM and

direction signals will be reset.

–

AD converter will be powered off.

–

GPIOs will be powered off.

–

Current DAC will be powered off.

–

Operational amplifiers will be powered off.

–

Watchdog count will be reset (while Watchdog flags won’t be reset).

–

Interrupt controller will be powered off.

–

Digital comparator will be powered off.

Additionally the system regulators will be powered off but only if the voltage that caused the

nRST_int event is checked before the system regulator in the power up sequence. This

means that:

–

all system regulators will be powered off if nRST_int is caused by VSupply,

VSupplyInt, VPump (and also if V3v3 causes a POR);

–

no one of the system regulators will be powered off if nRST_int is caused by

VGPIO_SPI;

–

only the system regulators that follows the system regulator that caused the

nRST_int in power up sequence will be powered off.

Table 6.

Stretch time selection

ID[1]

ID[0]

Selected stretch time

Note

Typ

16ms

Default state

32ms

48ms

64ms

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