Quectel M12 User Manual

M12 Hardware Design
M12_Hardware_Design_V3.3 - 55 -
Table 16: Pin definition of the ADC
Name
Pin
Function
ADC0
41
Analog to digital converter.
ADC1
40
Analog to digital converter
Table 17: Characteristics of the ADC
Item
Min
Typ
Max
Units
Voltage Range
0
2.8
V
ADC Resolution
10
bits
ADC Accuracy
2.7
mV
3.12. Behaviors of the RI
Table 18: Behaviors of the RI
State
RI response
Standby
HIGH
Voice calling
Changed to LOW, then:
1. Changed 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. Changed to HIGH when SMS is received.
Data calling
Changed to LOW, then:
1. Changed 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. Changed to HIGH when SMS is received.
SMS
When a new SMS comes, the RI changes to LOW and holds low level for
about 120 ms, then changes to HIGH.
URC
Certain URC can trigger 120ms low level on RI. For more details, please
refer to the document [10]
If the module is used as a caller, the RI would maintain high except the URC or SMS is received.
On the other hand, when it is used as a receiver, the timing of the RI is shown below:
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Quectel M12 Specifications

General

Brand	Quectel
Model	M12
Category	Control Unit
Language	English