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UART4_RXD
UART5_TXD
UART5_RXD
UART7_TXD
UART7_RXD
UART8_TXD
UART8_RXD
The power domain of UART is 1.8 V. You can use a level-shifting chip between the module and host's
UART if the power domains are not matching:
VCCIOx
C1
100 pF
UARTx_RXD
UARTx_TXD
Figure 12: Reference Design of UART with Level-shifting Chip
NOTE
Debug UART is similar to UARTx and for the reference design, refer to Figure 12. For debug UART,
VCC_PMUIO2 is used as power supply pin for VCCA.
4.5. I2C Interfaces
The module supports up to 5 groups of I2C interfaces. 4 of them are configured by default, and 1 of them
is multiplexed from other interfaces. For detailed multiplexing relationship, see document [2]. All I2C
interfaces are open drain signals and therefore you must pull them up externally. The reference power
domain is 1.8 V.
SG368Z_Series_Hardware_Design
349
DI
332
DO
331
DI
327
DO
328
DI
361
DO
357
DI
VCCA
10K
OE
120K
A1
A2
UART4 receive
UART5 transmit
UART5 receive
UART7 transmit
UART7 receive
UART8 transmit
UART8 receive
VCCB
U1
GND
B1
B2
Smart Module Series
VDD_3.3 V
C2
100 pF
TXD_3.3 V
RXD_3.3 V
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