UMTS/HSPA Module Series
UC20 Hardware Design
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A reference circuit is shown in the following figure
.
4.7K
47K
VBAT
2.2K
Module
SLEEP_IND
Figure 33: Reference Circuit of the SLEEP_IND
3.17. Behavior of the RI
You can use command
AT+QCFG=“risignaltype”, “physical”
to configure RI behavior:
No matter which port URC is presented on, URC will trigger the behavior on RI pin.
URC can be output from UART port, USB AT port and USB modem port by command
AT+QURCCFG
.
The default port is USB AT port.
In additional, RI behavior can be configured flexible. The default behavior of the RI is shown as below.
Table 23: Behavior of the RI
State
Response
Idle
RI keeps high level.
URC
RI outputs 120ms low pulse when new URC returns.
The RI behavior can be changed by command
AT+QCFG=“urc/ri/ring”
, refer to
document [1]
for
details.
NOTE
