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
Rev 1 Apr.17 16
41110693
4
4: Hardware Design Guidelines
BC127/BC127-HD with a Battery
Figure 4-1: Hardware Design
Note 1. VREGEN should be driven high 5ms after VBAT is applied to boot the
module.
Referring to the figure above, a Li-ion battery is connected to VBAT and VBUS from
an external USB source is connected to VCHG. It is assumed that the VBUS supply is
not connected permanently but periodically.
*This is the minimum voltage allowed to enable the module in the boot modes
described below.
Table 4-1: Pin Voltages
Net Min Typ Max
VCHG 3.1V*/4.75V 5V 5.75V
VBAT_SENSE 2.8V 3.7V 4.25V
VBAT 2.8V 3.7V 4.25V
VDD_PADS 1.7V 3.3V 3.6V
VREGEN 2.8V 3.7V 4.25V