BM78 Datasheet, PDF (18/60 Pages) Microchip Technology – Bluetooth® 4.2 Dual-Mode Module

BM78
2.9 Host MCU Interface over UART
Figure 2-8 illustrates an example of UART interface
with host MCU and power scheme using 3.3V to the
VDD. Battery power is applied to the BAT_IN pin. From
the LDO33_O pin, voltage can be routed to the
VDD_IO pin and external circuitry including the MCU.
This power scheme ensures that the BM78 and MCU
I/O voltages are compatible.
Note: The internal 3.3V LDO current source
should not exceed 50 mA (i.e maximum).
FIGURE 2-8:
POWER AND MCU INTERFACE EXAMPLE FOR BM78
Note 1: Ensure that VDD_IO and MCU VDD voltages are compatible.
2: The control and indication ports are configurable
DS60001380A-Page 18
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