L99MM70XP datasheet(14/68 Pages) STMICROELECTRONICS

14 / 68 page

Description

L99MM70XP

14/68

Doc ID 022637 Rev 2

Note:

“High” level for flash mode selection is VPWM2  VFlash. For all other operation modes,

standard 5 V logic signals are required.

3.2.3

VCC-standby mode

Outputs and internal loads are switched off. To supply the microcontroller in a low power

mode, the voltage regulator (VCC) remains active. The intention of the VCC-standby mode is

to preserve the RAM contents.

A LIN wake-up event sets the device into the active mode and forces the RXD pin to the

low-level.

A wake-up over INH switches device in active mode and start the watchdog.

The wake-up via SPI switches device in active mode. A status bit indicates the wake-up

source.

During the VCC-standby mode, the current at VCC is monitored.

The transition from active mode to VCC-standby mode is controlled by SPI.

3.2.4

VBAT-standby mode

To achieve minimum current consumption during VBAT-standby mode, all L99MM70XP

functions are switched off.

In VBAT-standby mode the current consumption of the L99MM70XP is reduced to 8 µA.

The transition from active mode to VBAT-standby mode is controlled by SPI.

3.3

Wake-up events

A wake-up from standby mode switches the device to active mode. This can be initiated by

one or more of the following sources:

●

Change of the LIN state at LIN bus interfaces

●

SPI access in VCC-standby mode (CSN is low and first rising edge on CLK)

●

A current at the INH pin (I > 120 µA) controlled by the CAN-transceiver (the CAN

transceiver is not a part of the IC).

LIN wake-up events in VCC-standby mode generate a low-pulse at RXD for 56 µs.

Wake-up from VCC-standby by SPI access might be used to check the interrupt service

handler.

Table 3.

Wake-up events

Wake-up source

Description

LIN

Always active

INH

Always active

VCC ICMP

Device remains in VCC-standby mode with

watchdog enabled (If ICMP = 0) and VCC goes

into high current mode (increased current

consumption). No interrupt is generated.

SPI access

Always active (except in VBAT-standby mode)

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