Hardware setup Connect power
Digi WR54 Hardware Reference
22
Battery power management
The WR54 power input range is 9-36 VDC. In addition, the WR54 includes a battery saver function. The
WR54 Power Management Unit (PMU) continuously monitors the power input (Vin) and applies the
predefined 10.5 V "turn-off” and 11.5 V "turn-on" supply voltage levels. Once low supply voltage is
detected during operation, the PMU applies the following timeout values before powering off the
WR54:
n If 9 V < Vin < 10.5 V "turn-off" voltage, the unit powers off after 360 seconds.
n If 6 V < Vin < 9 V, the unit powers off after 30 seconds.
n If Vin < 6 V, the unit powers off after 3 seconds.
Once the WR54 is powered off, it will power on again only if Vin > 11.5 V "turn-on” voltage.
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