Huawei Technologies Co. Ltd UM01-HW 用户手册
MC703 CDMA EV-DO Wireless Module V100R001
Product Description
Issue 1.00 (2009-9-10)
Huawei Proprietary and Confidential
Page 28 of 40
The UM01-HW UMTS module is connected to a 3 V single-chip microcontroller. You need to
add a 1000-ohm resistor between the two SD pins.
add a 1000-ohm resistor between the two SD pins.
Figure 4-2 Connections between the serial interface and the 3 V single-chip microcontroller
You can use a Category 232 chip to connect the UM01-HW UMTS module to a standard
RS-232-C interface. In the case of a 3-wire serial interface, the MAX3232 chip is
recommended. The UART1-SD pin of the module connects to the SD pin of the DTE after
being converted through the MAX3232 chip, and the RD pin of the DTE connects to the
UART1_RD pin of the module after being converted through the MAX232 chip.
RS-232-C interface. In the case of a 3-wire serial interface, the MAX3232 chip is
recommended. The UART1-SD pin of the module connects to the SD pin of the DTE after
being converted through the MAX3232 chip, and the RD pin of the DTE connects to the
UART1_RD pin of the module after being converted through the MAX232 chip.
4.3 USIM Card Interface
The UM01-HW UMTS module can connect to a 3V or a 1.8V USIM card. Table 4-2 shows
the signals of the USIM card interface. The level of the USIM card interface is 3 V or 1.8 V.
the signals of the USIM card interface. The level of the USIM card interface is 3 V or 1.8 V.
Table 4-2 Pins of the USIM card interface
Pin Number
Signal Name
Description
44
VREG_USIM
Power supply of the USIM card
48
USIM_RST
Reset signal of the USIM card
42
USIM_CLK
Clock signal of the USIM card
46
USIM_IO
Data signal of the USIM card
GND Ground