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Smart Machine Smart Decision
SIM5360_Hardware Design_V1.06
2016-11-17
33
The SIM5360 UART is 1.8V interface. A level shifter should be used if user’s application is equipped with
a 3.3V UART interface. The level shifter TXB0108RGYR provided by Texas Instruments is recommended.
The reference design of the TXB0108RGYR is in the following figures.
TXD
RXD
RTS
CTS
DTR
DCD
RI
A7
A1
A2
A3
A4
A5
A6
MODULE
TXB0108RGYR
UART port
A8
B7
B1
B2
B3
B4
B5
B6
B8
VCCA
OE
VDD_1V8 or
External 1V8
100nF
3.3V
100nF
VCCB
GND
TXD_3.3V
RXD_3.3V
RTS_3.3V
CTS_3.3V
DTR_3.3V
DCD_3.3V
RI_3.3V
47K
47K
Figure 21: Reference circuit of level shift
To comply with RS-232-C protocol, the RS-232-C level shifter chip should be used to connect SIM5360 to
the RS-232-C interface. In this connection, the TTL level and RS-232-C level are converted mutually.
SIMCom recommends that user uses the SP3238ECA chip with a full modem. For more information
please refers to the RS-232-C chip datasheet.
Note: SIM5360 supports the baud rate: 300, 600, 1200, 2400, 4800, 9600, 19200, 38400, 57600, 115200,
230400, 460800, 921600, 3200000, 3686400, 4000000bps. Default rate is 115200bps.
3.6
SD/MMC Interface
SIM5360 provides one 4-bit SD/MMC interface. Its operation voltage is 2.85V, with clock rates up to 52
MHz. It supports 1-bit SD/MMC or 4-bit SD data transmission mode. Though the same hardware
controller is used, the initialization procession for SD or MMC cards is different. SIM5360 will detect
which card is inserted automatically.
Note: Interface with SD/MMC memory cards up to 32GB.
3.6.1
Pin Description
Table 13: Pin description
Pin name
Pin No.
Function
SD_DATA0
22
SD card data0
SD_DATA1
23
SD card data1
SIMCOM
CONFIDENTIAL
FILE