User guide

CM52 Integrators’ Manual
WI_DEV_CM52_UGD_001-001
Page 42 of 53
CM52 Integrators’ Manual
3.2 Data Group Recommended Circuitry
The data group contains six signals: three output signals from application, two input signals to
application, and one I/O signal.
VREF_CA
30, RD (DFMS)
25, CTS
1 - 100k
VCC
RxD
CTS
Phone Module
Application
VREF_CA
27, TD (DTMS)
28, RTS
26, DTR
1 - 100k
VREF_CA
TxD
RTS
DTR
VREF_CA
23, VPPFLASH/DCD
1 - 100k
VCC
DCD
100k
VREF_CA
VPPFLASH_EN
1 - 100k
VREF_CA
Figure 23: Data Group Diagram
3.2.1 VPPFLASH/DCD
This signal, located on pin 23 in the system connector, can be used by the application to enable
flashing of the phone module. To enter flash-mode, the application shall set VPPFLASH_EN active
high, then enable the MODULE_PWR_EN_B pin.
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