AirPrime Module Datasheet
Table Of Contents
- 1: Introduction
- 2: Physical Characteristics
- 3: Audio Circuit
- 4: Hardware Design Guidelines
- 5: Power Supply Sequencing
- 6: GPIO Electrical Specifications
- 7: Solder Reflow Profile
- A: Regulatory Certifications
- B: Packaging Dimensions
Product Technical Specification
Rev 1 Apr.17 18 41110693
Figure 4-2: Circuit to Support Discharged Battery Starting
If the voltage of the battery is below 2.9V, the charger will enter ‘trickle charge
mode’, when in this mode, the battery is charged at a current of a few milliamps in
order to safely charge deeply discharged batteries. Once the voltage of the
battery reaches anything above 2.9 V, fast charging mode will be used. In this
mode, the battery is charged at the current configured by the user in the battery
configuration settings, provided that there is enough headroom between the
charger’s input voltage and the voltage of the battery.
The BC127/BC127-HD will stop charging when the voltage at VBAT_SENSE
reaches 4.2V. The BC127/BC127-HD will shut down when the battery voltage
reaches 2.9V indicating that the battery is depleted.
BC127-EXT for Extended Range
The BC127-EXT (BC128 in the schematics in Figure 4-3 below) supports the
same supply and control configurations as the BC127. The BC127-EXT supports
an external 50 Ohm RF port for use in larger area applications to connect to an
external antenna with a greater gain than the internal module antenna for
extended range.