M10 Hardware Design
M10_HD_V3.0 - 58 -
Table 19: Characteristic of the ADC
Item Min Typ Max Units
Voltage range 0 2.8 V
ADC Resolution 10 bits
ADC accuracy 2.7 mV
3.13. Behaviors of the RI
Table 20: 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. Change 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 URCs 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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