RFM22
Register 1Ah. Low Battery Detector Threshold
Bit
D7
D6
Reserved
R
D5
D4
D3
D2
lbdt[4:0]
R/w
D1
D0
Name
Type
Reset value = xxx10100
Bit
Name
Function
7：5
Reserved
Reserved.
Low Battery Detector Threshold.
4：0
lbdt[4:0]
This threshold is compared to Battery Voltage Level. If the Battery Voltage is
less than the threshold the Low Battery Interrupt is set. Default = 2.7 V.*
*Note: The threshold can be calculated as Vthreshold = 1.7 + lbdt x 50 mV.
Register 1Bh. Battery Voltage Level
Bit
D7
D6
Reserved
R
D5
D4
D3
D2
vbat[4:0]
R
D1
D0
Name
Type
Reset value = xxxxxxxx
Bit
Name
Function
7：5
Reserved
Reserved.
Battery Voltage Level.
4：0
vbat[4:0]
The battery voltage is converted by a 5 bit ADC. In Sleep Mode the register is
updated in every 1 s. In other states it measures continuously.
94
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