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6. Baseband Specification
6.1.
Power Supply
The AirPrime AR7558 embedded module is powered via a single regulated DC power supply, 3.7V
nominal. The power supply requirements can be found in the following table.
Table 29.
Power Supply Requirements
Power Supply
Main DC Power Input Range
Power Supply Ripple
Maximum Current draw
AirPrime AR7558 does not support USB bus-powered operation. DC power must be supplied via the
VBATT input.
Table 30.
Power Supply Pads
Pad
Name
EA2
VBATT
EB2
VBATT
EC2
VBATT
6.1.1.
Under-Voltage Lockout (UVLO)
The power management section of the AirPrime AR7558 includes an under-voltage lockout circuit that
monitors supply and shuts down when VBATT falls below the threshold.
Figure 9.
Under-Voltage Lockout (UVLO) Diagram
The AirPrime AR7558 will power down and remain off until the level of VBATT returns to the valid
range and the ON/OFF signal is active.
4116922
0 to 1kHz
>1kHz
AR7558
Direction
Function
Input
Power Supply Input
Input
Power Supply Input
Input
Power Supply Input
Rev 1.0
Min
Typ
3.4
3.7
-
-
-
-
-
-
January 21, 2015
Max
Units
4.2
V
200
mVpp
50
mVpp
tbd
mA
If Unused
Must Be Used
Must Be Used
Must Be Used
30
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