User's Manual

M80 Hardware Design
M80_HD_V1.2 - 67 -
3.14. ADC
The module provides two ADC to measure the value of voltage. The command “AT+QADC” can
read the voltage value applied on ADC0 pin, while AT command “AT+QEADC” can read the
voltage value applied on ADC1 pin. For details of this AT command, please refer to document [1].
In order to improve the accuracy of ADC, the layout of ADC should be surrounded by ground.
Table 24: Pin definition of the ADC
Name
Pin
Description
ADC0
2
Analog to digital converter.
ADC1
1
Analog to digital converter.
Table 25: Characteristics of the ADC
Item
Min
Typ
Max
Units
Voltage Range
0
2.8
V
ADC Resolution
10
bits
ADC Accuracy
2.7
mV
3.15. Behaviors of the RI
Table 26: Behaviors of the RI
State
RI response
Standby
HIGH
Voice calling
Change to LOW, then:
1. Change to HIGH when call is established.
2. Use ATH to hang up the call, RI changes to HIGH.
3. Calling part hangs up, RI changes to HIGH first, and changes to LOW for
120ms indicating “NO CARRIER” as an URC, then changes to HIGH
again.
4. Change to HIGH when SMS is received.
Data calling
Change to LOW, then：
1. Change to HIGH when data connection is established.
2. Use ATH to hang up the data calling, RI changes to HIGH.
3. Calling part hangs up, RI changes to HIGH first, and changes to LOW for
120ms indicating “NO CARRIER” as an URC, then changes to HIGH
again.
4. Change to HIGH when SMS is received.