L99PM72PXP datasheet(21/128 Pages) STMICROELECTRONICS

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L99PM72PXP

Detailed description

Doc ID 023553 Rev 3

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To prevent the system from a deadlock condition (no wake up possible) a configuration

where the periodic timer interrupt and wake up by LIN and HS CAN are disabled, is not

allowed. The default configuration is entered for all wake-up sources in case of such an

invalid setting.

All wake-up events from V1_standby mode (except IV1 > ICMP) are indicated to the

microcontroller by a low-pulse (duration: 56 µs) at RxDL/NINT or RxDC/NINT (see Table 3:

CAN wake-up signalization)

Wake-up from V1_standby by SPI Access might be used to check the interrupt service

handler.

2.2.8

Wake up inputs

The de-bounced digital inputs WU1...WU3 can be used to wake up the L99PM72PXP from

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

edge)

For static contact monitoring, a filter time of 64µs 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 Timer 1 or Timer 2 (see Section 2.2.9). 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

IV1 >ICMP

Device remains in V1_standby mode but watchdog is enabled (If ICMP =0)

and the V1 regulator goes into High Current Mode (Increased Current

Consumption). No interrupt is generated.

Timer Interrupt /

Wake up of µC by TIMER

programmable by SPI

–V1_standby Mode: device wakes up and Interrupt signal is generated at

RxDL/NINT when programmable timeout has elapsed

–VBat_standby Mode: device wakes up, V1 regulator is turned on and

NReset signal is generated when programmable timeout has elapsed

SPI Access

Always active (except in VBat_standby mode)

Wake up event: CSN is low and first rising edge on CLK

Table 4.

Wake up from Standby Modes (continued)

Wake up source

Description

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