RFM22
Table 5. Auxiliary Block Specifications1
Parameter
Symbol
Conditions
Min
Typ
Max Units
Temperature Sensor
When calibrated using temp
sensor offset register
—
0.5
—
—
—
—
°C
mV/°C
mV
TSA
2
Accuracy
Temperature Sensor
—
—
—
5
TSS
2
Sensitivity
Low Battery Detector
50
LBDRES
LBDCT
2
Resolution
Low Battery Detector
250
μs
2
Conversion Time
Microcontroller Clock
Output Frequency
Configurable to 30 MHz,
15 MHz, 10 MHz, 4 MHz,
3 MHz, 2 MHz, 1 MHz, or
32.768 kHz
32.768K
—
30M
Hz
MC
General Purpose ADC
—
—
8
4
—
—
bit
ADCENB
ADCRES
2
Accuracy
General Purpose ADC
mV
2
Resolution
Temp Sensor & General
Purpose ADC Conversion
—
305
—
μs
ADCCT
2
Time
30 MHz XTAL Start-Up time
30 MHz XTAL Cap
—
—
1
—
—
ms
fF
t30M
97
30MRES
2
Resolution
2
—
—
—
—
—
6
—
—
—
—
—
sec
ppm
ppm
ms
t32K
32KRES
32KRCRES
tPOR
32 kHz XTAL Start-Up Time
2
100
2500
16
32 kHz XTAL Accuracy
2
32 kHz RC OSC Accuracy
POR Reset Time
2
100
μs
tsoft
Software Reset Time
Notes:
1. All specification guaranteed by production test unless otherwise noted.
2. Guaranteed by qualification.
8
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