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Hardware Integration Guide
Parameter
Input
C
IN-LED
capacitance
Caution:
Digital IOs shall not be pulled-up to an external voltage as this may cause VCC_1V8 to not go low
when the AirPrime AR7558 device is powered down. Also, this would partially bias the AirPrime
AR7558 device which could potentially damage the device or result in GPIOs being set to
undetermined levels.
5.6.
Internal Device Frequencies
The table below summarizes the frequencies generated within the AirPrime AR7558. This table is
provided for reference only to the device integrator.
Table 28.
Internal Device Frequencies
Subsystem/Feature
Real Time Clock
PCM Audio interface (Primary PCM Master Mode) [TBD]
I2C Interface
PMIC switching power supplies
GNSS Antenna bias switching supply
Fundamental clock, codec, TCXO_OUT
PLL
USB
4116922
Comments
LED signal only
Rev 1.1
Min
Typ
–
–
Frequency
32.768
8,
128,
2048
400
tbd
3.5
19.2
tbd
12,
480
GNSS Specification
Max
Units
5
pF
Units
kHz
kHz
kHz
MHz
MHz
MHz
MHz
Mb/s
January 21, 2015
29
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