hardware design v1.00

Smart Machine Smart Decision
SIM968_Hardware Design_V1.00 2013.02.25
49
6 Electrical, Reliability and Radio Characteristics
6.1 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 SIM968.
Table 20: Absolute maximum ratings of GSM
Symbol Parameter Min Typ Max Unit
VBAT GSM Power supply voltage - - 5.5 V
V
I
*
Input voltage -0.3 - 3.1 V
I
I
*
Input current - - 10 mA
I
O
*
Output current - - 10 mA
*
These parameters are for digital interface pins, such as keypad, GPIO, I
2
C, UART, LCD, PWMs and DEBUG.
Table 21: Absolute maximum ratings of GNSS
Symbol Parameter Min Typ Max Unit
GPS_VCC GNSS Power supply voltage - - 4.3 V
GPS_VANT_IN GNSS active antenna power
supply
-5.5V
-
+5.5 V
GPS_ANT GNSS radio antenna connection - - 3.08 V
V_BACKUP Power supply for GNSS RTC - - 4.6 V
I
I
I/O pin voltage - - 3.6 V
6.2 Recommended Operating Conditions
Table 22: Recommended operating conditions
Symbol Parameter Min Typ Max Unit
VBAT Power supply voltage 3.2 4.0 4.8 V
GPS_VCC GNSS Power supply voltage 2.8 3.3 4.3 V
V_BACKUP Power supply for GNSS RTC 2 2.8 4.6 V
T
OPER
Operating temperature -40 +25 +85 ℃
T
STG
Storage temperature -45 +90 ℃
Note: Operation in the temperature range –40°C~ –30°C is allowed but Time-to-First-Fix performance and tracking sensitivity
may be degraded.
6.3 Digital Interface Characteristics
Table 23: Digital interface characteristics of GSM