L99PM72GXP datasheet(22/129 Pages) STMICROELECTRONICS

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Detailed description

L99PM72GXP

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DocID024767 Rev 4

configuration, the input status is updated according to the cyclic sense timing; therefore,

reading the input status in this mode may not reflect the actual status).

2.2.9

Cyclic contact supply

In V1_standby and VBat_standby modes, any high side driver output (OUT1..4, OUTHS) can be

used to periodically supply external contacts.

The timing is selectable by SPI

Timer 1: period is X s. The on-time is 10 ms resp. 20 ms: with X

∈ {1, 2, 3, 4s}

Timer 2: period is X ms. The on-time is 100 µs resp. 1 ms: with X

∈ {10, 20, 50, 200 ms}

Timer 1 and Timer 2 are re-started with every valid write command to CR3 (CSN low to high

transition). The timers start with the off-phase.

2.2.10

Timer interrupt / wake-up of microcontroller by timer

During standby modes the cyclic wake up feature, configured via SPI, allows waking up the

µC after a programmable timeout according to timer1 or timer 2.

From V1_standby mode, the L99PM72GXP wakes up (after the selected timer has elapsed)

and sends an interrupt signal (via RxDL/NINT pin) to the µC. The device enters active mode

and the watchdog is started with a long open window. The microcontroller can send the

device back into V1_standby after finishing its tasks.

From Vbat_standby mode, the L99PM72GXP wakes up (after the selected timer has elapsed),

turns on the V1 regulator and provides an NRESET signal to the µC. The device enters

active mode and the watchdog is started with a long open window. The microcontroller can

send the device back into Vbat_standby after finishing its tasks.

2.3

Functional overview (truth table)

Table 5. Functional overview (truth table)

Function

Comments

Operating modes

Active Mode

V1_standby

static mode

(cyclic sense)

VBat_standby

static mode

(cyclic sense)

Voltage regulator, V1

VOUT=5V

On(1)

Off

Voltage regulator, V2

VOUT=5V

On/ Off(2)

On(2) / Off

Reset generator

Off

Window watchdog

V1 monitor

Off (ON: IV1 >ICMP-

threshold and

ICMP =0)

Off

Wake up

Off

Active(3)

HS-cyclic supply

Oscillator

time base

On / Off

On(2) / Off

Relay driver

Off

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