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WM_PRJ_Q2686_PTS_001-010
June 30, 2009
Q2686 Wireless CPU
®
3.10
Analog to Digital Converter
Two Analog to Digital Converter inputs are provided by the Q2686 Wireless
CPU
®
. The converters are more than 10-bit resolution, ranging from 0 to 2V.
ADC1 / BAT-TEMP input can be used, typically, to monitor external
temperature, useful for safety power off in case of application over heating (for
Li-Ion battery).
ADC2 input can be used for customer application.
ADC pin description
Signal
Pin number I/O
I/O type
Description
ADC1/BAT-TEMP* 20 I Analog A/D
converter
ADC2 21
I
Analog
A/D
converter
* This input can be used for a battery charging temperature sensor,
see Chapter 3.13, “Battery Charging interface“.
ADC electrical characteristics
Parameter
Min
Typ
Max
Unit
Maximum output code
1635
LSB
Sampling period
0,5
3
1
s
Input signal range
0
2
V
ADC1/BAT-
TEMP
1M
Ω
Input
impedance
ADC2
1M
Ω
1
Sampling rate only for ADC2 and Open AT
®
application.
