User's Manual

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INTERFACE DESCRIPT
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1/155 19-KRD 104 1025 Uen PA4
5.2.2 OVP
Function: Over voltage protection
Description: Status indicator to host of potential malfunction in Daughter Card
circuitry
Pin Number: 4
Signal Name: OVP (PU) [daughter card⇒host]
If not used: Required
Details:
The OVP signal is simply an output from the main onboard regulator. In it’s operational
state under normal functional conditions this will output 3.6V nominal
Parameter Condition Min Typ Max Unit
Normal 3.6 V
UVP output voltage
Fault 3.7 V
Table 5.2-2: OVP Electrical Characteristics
5.2.3 RI
Function: Ring Indicator
Description: Alert signal from the modem to indicate an incoming SMS, or
unmasked unsolicited response
Pin Number: 20
Signal Name: RI [modem⇒host]
If not used: Leave open
Details:
Ring Indicator is essentially a wake-up call from the modem to the host application to
signal one of two events:
• an in-coming message (SMS).
• an unmasked unsolicited response/result code.
For the EDGE modem the Ring Indicator is implemented as a GPIO interface within the
EDGE baseband device.