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FIBOCOM SC138-
NA
Series Hardware Guide
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V D D _1V 8
U A R T _T X D
U A R T _C T S
M C U _R T S
0.1uF
U A R T _R X D
V C C A
O E
V C C B
G N D
A 1
A 2
A 3
A 4
B 4
B 3
B 2
B 1
C onverter
0.1uF
V D D _M C U
M C U _T X D
M C U _R X D
M C U _C T S
U A R T _R T S
Figure 3-11 Reference circuit of level conversion
3.6
SPI
SC138 series modules provide a set of SPI interfaces and only support the main device mode. The pin
definition is shown in the following figure:
Table 3-9 Definition of pins of SPI interfaces
Pin Name
Pin No.
I/O
Description
Remarks
SPI_CLK
113
DO
SPI clock
-
SPI_CS
114
DO
SPI device selection
-
SPI_MISO
115
DI
SPI MISO
-
SPI_MOSI
116
DO
SPI MOSI
-
3.7
(U) SIM
SC138 series modules support 2-channel (U)SIMs, dual-SIM dual standby and single-pass functions, as
well as hot plug (off by default).
Table 3-10 (U)SIM pin definition
Pin Name
Pin No.
I/O
Description
Remarks
UIM1_DATA
25
I/O
(U)SIM 1 data
-
UIM1_CLK
24
DO
(U)SIM 1 clock
-
