ST62T40B datasheet(52/76 Pages) STMICROELECTRONICS

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ST62T40B/E40B

4.6 POWERSUPPLY SUPERVISOR DEVICE (PSS)

The Power Supply Supervisor device, described in

the Figure 32, permits supervising the crossing of

the PSS pin voltage (VPSS) through a program-

mable voltage (mxVDD/n), where n and m can be

chosen by software. This device includes:

– An internal comparator which is connected to the

internal INT line to make an interrupt request to

the Core.

– 2 resistive voltage dividers that are, respectively,

supplied by the PSS pin and the VDD pin. These

two voltage dividers are both connected to the

two inputs of the internal comparator. They con-

sist of 13 identical resistors. It is possible to se-

lect by software 5 voltage rates on the PSS

divider (nxVPSS/13) and 4 voltage rates on the

VDD divider (mxVDD/13). The n and m values can

be chosen by software. These two voltage divid-

ers are disconnected in STOP mode, and when

the PSS device is OFF.

– An internal device that allows the detection with

an hysteresis of VDD/13.

The PSS device is supplied by an internal connec-

tion to VDD supply. The following paragraphs de-

scribe the operating mode of the PSS device and

the PSS register that permits control over the PSS

device. The PSS device is switched off as soon as

the Core executes the STOP instruction, but con-

tinues to work in the WAIT mode.

Figure

31. PSS Device

Operating

Modes

Description

Figure 32. PSS Device Block Diagram

VPSS

(m+1)x/VDD/13

mx/VDD/13

PIF

nxVPSS/13

VR02044A

PSS

VDD

PSS ON

INTERRUPT LINE

PIF

Ω (UP to 13 STEPS)

SEQUENCER

& LOGIC

SYNCHRO

VA0060

624

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