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2. Power Interface
2.1.
Power Supply
The AirPrime HL8548 is supplied through the VBAT signal.
Table 1.
Power Supply
Pin Numbers
2, 24, 39, 41, 52
*
This value has to be guaranteed during the burst
Note:
Load capacitance for VBAT is around 30µ F ± 20% embedded inside the accessory board.
2.2.
Power Off Sequence
To power the HL8548 off:
1. Put the accessory board in low power mode (LPM) by sending either AT+KSLEEP=1 or
AT+CPWROFF=1.
2. Wait for at least 10 seconds.
3. Remove the power supply to VBAT.
2.3.
Sleep Mode Management
Use AT+KSLEEP=1 to allow the accessory board to automatically enter sleep mode while the USB
interface is in use.
When AT+KSLEEP=2, the accessory board will never enter sleep mode.
4119996
Supply
VBAT voltage (V)
Rev 1.4
Minimum
Typical
3.2*
3.7
April 10, 2017
Maximum
4.5
9
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