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Hardware Integration Guide
Function
GNSS
Time measurement
USB
UART
Digital IO
Events that cause the AirPrime AR7558 to wake-up from Deep Sleep mode include:
Incoming call
Expiration of an internal timer in the AirPrime AR7558
USB_VBUS is applied to the AirPrime AR7558
WAKE_N is asserted (low)
UART1 DTR is asserted (high) if UART1 DTR has been enabled as a sleep control
(AT+W32K=1,1) and AT Command Service is mapped to UART1
GNSS location fix request is initiated from an Embedded Application
See the
Ring Indicator
external application of a wake-up event while the AR device is in sleep mode.
6.3.3.1.
Sequence to Enter Deep Sleep Mode
The following list defines the sequence needed by the application to allow the AirPrime AR7558 to
enter Deep Sleep mode:
1. AR7558 has registered on the WWAN network (or callbox), and is not in a call.
2. End GNSS Tracking session.
3. Turn off GNSS Antenna bias.
4. Confirm WAKE_N is not held low (pulled-up in AirPrime AR7558).
5. Issue AT command to request AR device to enter deep sleep (AT+W32K=1,x).
6. If AT+W32K=1,1 is used, DTR must also be de-asserted to allow sleep.
7. Ensure UARTs are in the inactive state.
8. Remove VBUS from being applied to the AR device.
6.4.
USB
The AirPrime AR7558 has a High Speed USB2.0 compliant, peripheral only interface.
Table 40.
USB Pad Details
Pad
Name
DA7
USB_VBUS
DB6
USB_D_P
DA6
USB_D_M
DD5
USB_ID
The AR7558 will not be damaged if a valid USB_VBUS is supplied while the main DC power is not
supplied.
4116922
Availability
-
-
-
-
section for more information about configuring the RI signal to notify an
Direction
Input
In/Out
In/Out
In/Out
Rev 1.1
Conditions
GNSS is powered down
USB_VBUS is not applied
Digital IO pins maintained last state
Function
USB Power Supply
Differential data interface positive
Differential data interface negative
USB ID
Baseband Specification
January 21, 2015
35
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