User's Manual

SIM900L Document
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4.2 Recommended Operating Conditions
Table 5: Recommended operating conditions
Symbol Parameter Min Typ Max Unit
VBAT Power supply voltage 3.2 4.0 4.8 V
T
OPER
Operating temperature -40 +25 +85 ℃
T
STG
Storage temperature -45 +90 ℃
4.3 Digital Interface Characteristics
Table 6: Digital interface characteristics
Symbol Parameter Min Typ Max Unit
I
IH
High-level input current -10 - 10 uA
I
IL
Low-level input current -10 - 10 uA
V
IH
High-level input voltage 2.4 - - V
V
IL
Low-level input voltage - - 0.4 V
V
OH
High-level output voltage 2.7 - - V
V
OL
Low-level output voltage - - 0.1 V
* These parameters are for digital interface pins, such as keypad, GPIO, I
2
C, UART, LCD, PWMs and DEBUG.
4.4 SIM Card Interface Characteristics
Table 7: SIM card interface characteristics
Symbol Parameter Min Typ Max Unit
I
IH
High-level input current -10 - 10 uA
I
IL
Low-level input current -10 - 10 uA
1.4 - - V
V
IH
High-level input voltage
2.4 - - V
- - 0.4 V
V
IL
Low-level input voltage
2.4 V
1.7 - - V
V
OH
High-level output voltage
2.7 - - V
- - 0.1 V
V
OL
Low-level output voltage
- - 0.1 V
4.5 VDD_EXT Characteristics