Rising Edge Triggered Wake-Up Mode - Analog Devices AD5100 Manual

RISING EDGE TRIGGERED WAKE-UP MODE

As indicated in Figure 29, the microprocessor can control its
own power-down sequence using the rising edge triggered
wake-up signal. The operator must select the rising edge
triggered wake-up mode setting for the V
threshold value, as shown in Table 6, by setting Register
0x04[3:1] = 1001.
When the rising edge wake-up signal is detected by V
the AD5100 is powered up with the SHDN pin pulled high.
The external regulator is turned on to supply power to the
microprocessor. A reset pulse train is generated at the reset
turn-off
2MON
,
2MON
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output if there is no watchdog activity. The pulse continues
until the correct watchdog signal appears at the AD5100 WDI
pin. The shutdown pin remains high as long as the AD5100
continues to receive the correct watchdog signal.
When the microprocessor finishes its housekeeping tasks or
powers down the software routine, it stops sending a watchdog
signal. In response, the AD5100 generates a reset. The shut-
down pin is pulled low 2 seconds after, and the regulator output
drops to 0 V, which shuts down the microprocessor. At that
point, the AD5100 enters sleep mode.
AD5100