Quectel SG368Z Series User Manual

Smart Module Series
SG368Z_Series_Hardware_Design 49 / 113
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:
VCCA
VCCB
OE
A1
A2
GND
B1
B2
VCCIOx
UARTx_RXD
TXD_3.3 V
VDD_3.3 V
C1
100
pF
C2
U1
100
pF
RXD_3.3 V
10K
120K
UARTx_TXD
Figure 12: Reference Design of UART with Level-shifting Chip
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.
UART4_RXD
349
DI
UART4 receive
UART5_TXD
332
DO
UART5 transmit
UART5_RXD
331
DI
UART5 receive
UART7_TXD
327
DO
UART7 transmit
UART7_RXD
328
DI
UART7 receive
UART8_TXD
361
DO
UART8 transmit
UART8_RXD
357
DI
UART8 receive
NOTE

Quectel SG368Z Series Specifications

General

Brand	Quectel
Model	SG368Z Series
Category	Control Unit
Language	English