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SIM7600E_SIM7600E-H-PCIE_Hardware_Design_V1.00 23 2017-11-23
The reference design of the TXB0108RGYR is in the following figures.
TXD
RXD
RTS
CTS
DTR
RI
A7
A1
A2
A3
A4
A5
A6
MODULE
TXB0108RGYR
UART port
A8
B7
B1
B2
B3
B4
B5
B6
B8
VCCA
OE
1V8
100nF
3V3
100nF
VCCB
GND
TXD_3.3V
RXD_3.3V
RTS_3.3V
CTS_3.3V
DTR_3.3V
RI_3.3V
47K
47K
47K
47K
Figure 15: Reference circuit of level shift
To comply with RS-232-C protocol, the RS-232-C level shifter chip should be used to connect SIM7600E-PCIE
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: SIM7600E-PCIE supports the following baud rate: 300, 600, 1200, 2400, 4800, 9600, 19200, 38400,
57600, 115200, 230400, 460800, 921600, 3200000, 3686400, 4000000bps. Default baud rate is 115200bps.
4.9 I2C Interface
SIM7600E-PCIE provides I2C interface compatible with I2C specification, version 5.0, with clock rate up to
400 kbps. Its operation voltage is 1.8V.
Note: Since the I2C is connected to the audio codec chip on board, the users should choose the I2C device
whose address is not the same with the audio codec (0x34). If the the audio codec chip is not mounted on
board, users could ignore this.
The following figure shows the I2C bus reference design.
Module
SDA
Device
SDA
GNDGND
SCL
SCL
Figure 16: I2C Reference Circuit
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