L99PM62GXPTR datasheet(32/102 Pages) STMICROELECTRONICS

32 / 102 page

Detailed description

L99PM62GXP

32/102

Doc ID 17639 Rev 4

Normal pattern wake up

Normal pattern wake up can occur when CAN pattern wake up option is enabled and the

CAN transceiver was set in standby mode while CAN bus was in recessive (high) state or

dominant (low) state. In order to wake up the L99PM62GXP, the following criteria must be

fulfilled:

●

The CAN interface wake-up receiver must receive a series of two consecutive valid

dominant pulses, each of which must be longer than 2 µs

●

The distance between 2 pulses must be longer than 2 µs.

●

The two pulses must occur within a time frame of 1.0 ms

Wake up from short to GND condition

Even if CAN pattern wake up option is enabled, but the CAN transceiver was set in standby

mode after a qualified permanent dominant state, recessive level at CAN, switches the

L99PM62GXP to active mode.

No pattern wake up

If the CAN pattern wake up option is disabled, any transition either dominant (low) state to

recessive (high) state or recessive (high) state to dominant (low) state switches the

L99PM62GXP to active mode (after a filtering time of 2 µs).

Note:

A wake up caused by a message on the bus starts the voltage regulator and the

microcontroller to switch the application back to normal operation mode.

Figure 18.

CAN wake up capabilities

Note:

Pictures above illustrate the wake up behaviour from V1 standby mode. For wake up from

VBAT standby mode an NReset pulse is generated instead of the RXDL (Interrupt) signal.

L99PM62GXPTR Datasheet(PDF) 32 Page - STMicroelectronics