User's Manual

SIM900E Document
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3.2. Digital Interface Characteristics
Table 2: 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, LCDand DEBUG.
3.3. SIM Card Interface Characteristics
Table 3: 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
V
IH
High-level input voltage
1.4 - - V
2.4 - - V
V
IL
Low-level input voltage
- - 0.4 V
2.4 V
V
OH
High-level output voltage
1.7 - - V
2.7 - - V
V
OL
Low-level output voltage
- - 0.1 V
- - 0.1 V
3.4. SIM_VDD Characteristics
Table 4: SIM_VDD characteristics
Symbol Parameter Min Typ Max Unit
V
O
Output voltage
2.75 2.9 3.00
V
1.65 1.80 1.95
I
O
Output current - - 10 mA