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AS8515

Datasheet - AS8515 To p Die Overview

7.8 Window Watchdog (WWD)

The Window Watchdog ensures that the Microcontroller is properly functioning in the normal mode of the device. The Watchdog is started after a

reset and the Microcontroller needs to send a trigger in the window of WD_TSV (service time). If the trigger occurs early, in the period WD_TCL,

or after WD_TSV, a reset output is generated.

The Microcontroller can access the trigger bit for the watchdog through SPI. The WWD can be enabled and the window times can be

programmed through factory setting and enabled as a factory option.

Figure 5. Window Watchdog Functionality

7.9 Timeout Watchdog (TWD)

The Timeout Watchdog ensures that the Microcontroller is in proper functional state in the device standby mode. The Watchdog timer will be

started upon a rising edge on INT and will generate a reset output if the Microcontroller doesn’t send a trigger before the timeout.

The Microcontroller can access the trigger bit for the watchdog through SPI. The TWD can be enabled by factory setting and the timeout interval

can be programmed through SPI.

Period

Non-Service time (WD_TCL)

Service time (WD_TSV)

Trigger

restart

period

Trigger

via SPI

Last trigger

Earliest point for

correct trigger

(No RESET)

50 %

100 %

Wrong trigger

(RESET generation)

Correct trigger

(No RESET)

Latest point for

correct trigger

(No RESET)

Wrong trigger

(RESET generation)

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