User's Manual

Smart Machine Smart Decision
SIM7020G_User Manual_V1.00 33 2019-01-15
Table 18: Electronic characteristic
Pin name
Description
Min.
Typ.
Max.
Unit
VDD_EXT
V
VDD_EXT
Output voltage
1.7
1.8
1.9
V
I
O
Output current
-
-
50
mA
VDD_3V3
V
VDD_3V3
Output voltage
3.2
3.3
VBAT-0.1
V
I
O
Output current
-
-
50
mA
3.11 I2C Interface
The SIM7020G provides an I2C interface which is only used in the embedded AT application.
Table 19: Pin definition of the I2C
Notes:
1. This function is not supported in the standard firmware. If customer wants this function, the
firmware must be customized. Please contact SIMCom for more details.
2. If customer design I2C please pull up to VDD_EXT.
3. I2C is master mode 400kbps,up to 3.4Mbp,supporting7-bit/10-bit addressing.
Table 20: I2C multiplexing function
Pin name
Pin number
Mode 0(default)
Mode 1
SCL
74
SCL
GPIO6
SDA
75
SDA
GPIO7
Note: Multiplexing function need different software supply.
Pin name
Pin
number
Description
Comment
SCL
65
I2C serial bus clock
Voltage Domain: 1.8V
SDA
64
I2C serial bus data