3.10 Power Supply Output - SimCom SIM7020C Hardware Design

Table 16: ADC electronic characteristics
Characteristics
Resolution
Input Range
Note: "AT+CADC" can be used to read the voltage of the ADC pin, for more details, please refer to
document [1].

3.10 Power Supply Output

SIM7020 has a LDO power output named VDD_EXT. The output voltage is 1.8V. Meanwhile it has
a DCDC power output named VDD_3V3, which voltage range is 3.3V-3.5V (depend on VBAT).
Both of them are not present in PSM mode.
VBAT
PWRKEY
( Input)
VDD_EXT
( Output )
VBAT
PWRKEY
( Input)
VDD_3V3
( Output )
Table 17: Electronic characteristic
Pin name Description
VDD_EXT
V Output voltage
VDD_EXT
I Output current
O
VDD_3V3
V Output voltage
VDD_3V3
I Output current
O
SIM7020_Hardware_Design_V1.02
64ms
Figure 20： Power on sequence of the VDD_EXT
70ms
Figure 21：Power on sequence of the VDD_3V3
Min.
1.7
-
3.2
-
Min. Typ.
– 10
0.1 –
Typ.
1.8
-
3.3
-
27
Smart Machine Smart Decision
Max. Unit
– Bits
1.4 V
Max. Unit
1.9 V
50 mA
VBAT-0.1 V
50 mA
2018-07-25