L99PM72GXP datasheet(24/129 Pages) STMICROELECTRONICS

部件名	L99PM72GXP

功能描述	Advanced power management system IC with embedded LIN and high speed CAN transceiver supporting CAN Partial Networking

PDF	129 Pages

Scroll/Zoom	100%

制造商	STMICROELECTRONICS [STMicroelectronics]

网页	http://www.st.com

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24 / 129 page

Detailed description

L99PM72GXP

24/129

DocID024767 Rev 4

Figure 9. Main operating modes

2.4

Configurable window watchdog

During normal operation, the watchdog monitors the micro controller within a programmable

trigger cycle: (10 ms, 50 ms, 100 ms, 200 ms)

In VBat_standby and Flash program modes, the watchdog circuit is automatically disabled. In

V1_standby mode a wake up by timer is programmable in order to wake up the µC (see

Section 2.2.10). After wake-up, the Watchdog starts with a long open window. After serving

the watchdog, the microcontroller may send the device back to V1_standby mode.

After power-on or Standby mode, the watchdog is started with a long open window (65 ms

nominal). The long open window allows the micro controller to run its own setup and then to

trigger the watchdog via the SPI. The trigger is processed when the CSN input becomes

HIGH after the transmission of the SPI word.

Writing '1' to the watchdog trigger bit terminates the long open window and start the window

watchdog (the timing is programmable by SPI). Subsequently, the micro controller has to

L99PM72GXP 数据表(PDF) 24 Page - STMicroelectronics