L99PM62XP datasheet(19/98 Pages) STMICROELECTRONICS

19 / 98 page

L99PM62XP

Description

Doc ID 16363 Rev 4

19/98

2.2.6

Wake-up inputs

The de-bounced digital inputs WU1 to WU3 can be used to wake up the L99PM62XP from

standby modes. These inputs are sensitive to any level transition (positive and negative

edge)

For static contact monitoring, a filter time of 64 µs is implemented at WU1-3. The filter is

started when the input voltage passes the specified threshold.

In addition to the continuous sensing (static contact monitoring) at the wake up inputs, a

cyclic sense functionality is implemented. This feature allows periodical activation of the

wake-up inputs to read the status of the external contacts. The periodical activation can be

linked to Timer1 or Timer2 (see Section 2.2.7: Cyclic contact supply ). The input signal is

filtered with a filter time of 16 µs after a programmable delay (80 µs or 800 µs) according to

the configured timer on-time. A wake-up is processed if the status has changed versus the

previous cycle.

The outputs OUT_HS and OUT1-4 can be used to supply the external contacts with the

timer setting according to the cyclic monitoring of the wake-up inputs.

If the wake-up inputs are configured for cyclic sense mode the input filter timing and input

filter delay (WUx_filt in control register 2) must correspond to the setting of the high-side

output which supplies the external contact switches (OUTx in control register 0).

In standby mode, the inputs WU1-3 are SPI configurable for pull-up or pull-down current

source configuration according to the setup of the external. In active mode the inputs have a

pull down resistor.

In active mode, the input status can be read by SPI (Status Register 2). Static sense should

be configured (Control Register 2) before the read operation is started (In cyclic sense

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).

2.2.7

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 Xs. The on-time is 10 ms resp. 20 ms: With X

∈ {1, 2, 3, 4 s}

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

∈ {10, 20, 50, 200 ms}

2.2.8

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 timer2.

From V1 standby mode, the L99PM62XP 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 L99PM62XP 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.

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