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The following figure is an example of connection between UG95 and PC. A voltage level translator and a
RS-232 level translator chip must be inserted between module and PC, since the UART interface does
not support the RS-232 level, while supports the 1.8V CMOS level only.
VDD_EXT
DCD
TXD
CTS
RI
RXD
DTR
RTS
GND
Module
NOTES
1.
The module disables the hardware flow control by default. When hardware flow control is required,
RTS and CTS should be connected to the host. AT command AT+IFC=2,2 is used to enable
hardware flow control. AT command AT+IFC=0,0 is used to disable the hardware flow control. For
more details, please refer to document [1].
2.
Rising edge on DTR will let the module exit from the data mode by default. It can be disabled by AT
commands. Refer to document [1] for details.
3.
DCD is used as data mode indication. Refer to document [1] for details.
4.
It is suggested that you should set USB_DP, USB_DM and USB_VBUS pins as test points and then
place these test points on the DTE for debug.
3.11. USIM Card Interface
The USIM card interface circuitry meets ETSI and IMT-2000 SIM interface requirements. Both 1.8V and
3.0V USIM cards are supported.
UG95_Hardware_Design
OE
VCCA
VCCB
DCD_1.8V
DCD_3.3V
TXD_1.8V
TXD_3.3V
CTS_1.8V
CTS_3.3V
RI_1.8V
RI_3.3V
RXD_1.8V
RXD_3.3V
DTR_1.8V
DTR_3.3V
RTS_1.8V
RTS_3.3V
GND
TXS0108EPWR
Figure 22: RS232 Level Match Circuit
Confidential / Released
3.3V
VCC
DIN1
DIN2
DIN3
DIN4
DIN5
R1OUTB
ROUT1
ROUT2
ROUT3
FORCEON
/INVALID
3.3V
/FORCEOFF
Translator
UMTS/HSPA Module Series
UG95 Hardware Design
5
GND
GND
1
DOUT1
DCD
2
DOUT2
RXD
8
DOUT3
CTS
9
DOUT4
RI
6
DOUT5
DSR
3
TXD
RIN1
4
DTR
RIN2
7
RTS
RIN3
DB9M
PC side
39 / 72
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