User's Manual

SIM800H Document
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2. Detail Block Diagram
Analog base
band
Digital base
band
Power management unit
Radio
Frequency
Power
supply
Analog Interface
Digital Interface
UART
SIM
GPIOs
RTC
Audio
ADC
RF
BT
FM
USB
KEY
Figure 3: Block diagram of SIM800H
3. Electrical and Reliability Characteristics
3.1. Absolute Maximum Ratings
The absolute maximum ratings stated in following table are stress ratings under non-operating conditions. Stresses
beyond any of these limits will cause permanent damage to SIM800H.
Table 1: Absolute maximum ratings
Symbol Parameter Min Typ Max Unit
VBAT Power supply voltage - - 4.5 V
VBUS - - 30 V VBUS
I
I
*
Input current - - 8 mA
I
O
*
Output current - - 8 mA
*
These parameters are for digital interface pins, such as keypad, GPIO, I
2
C, UART, LCD and DEBUG.
3.2. Digital Interface Characteristics
Table 2: Digital interface characteristicsȱ