Usim Card Interface - Quectel UC20 Hardware Design

VDD_EXT
DCD
TXD
CTS
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] about the command AT&D and AT&V for details.
3. DCD is used as data mode indication. Refer to document [1] about the command AT&C and AT&V
for details.

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.
Table 12: Pin Definition of the USIM Interface
Pin Name
USIM_VDD
USIM_DATA
UC20_Hardware_Design
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OE
VCCA
DCD_1.8V
TXD_1.8V
CTS_1.8V
RI RI_1.8V
RXD_1.8V
DTR_1.8V
RTS_1.8V
GND
TXS0108PWR
Figure 21: RS232 Level Match Circuit
Pin No. I/O Description
14 PO Power supply for USIM card.
15 IO Data signal of USIM card.
3.3V
VCCB VCC
DCD_3.3V DIN1
TXD_3.3V DIN2
CTS_3.3V DIN3
RI_3.3V DIN4
DIN5
R1OUTB
RXD_3.3V ROUT1
ROUT2
DTR_3.3V
RTS_3.3V ROUT3
FORCEON
3.3V
/FORCEOFF
SN65C3238
Confidential / Released
UMTS/HSPA Module Series
UC20 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
/INVALID
DB-9
Connect to PC
Comment
Either 1.8V or 3.0V is supported
by the module automatically.
Pull-up to USIM_VDD with 15k
resistor internally.
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