BM62 datasheet(21/70 Pages) MICROCHIP

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 2016 Microchip Technology Inc.

DS60001403A - Page 21

BM62/64

4.0

POWER MANAGEMENT UNIT

The on-chip Power Management Unit (PMU) has two

main features: lithium-ion and lithium-polymer battery

charger, and voltage regulation. A power switch is used

to switch over the power source between the battery

and adaptor. Also, the PMU provides current to drive

two LEDs.

4.1

Charging a Battery

The BM62/64 module has a built-in battery charger

which is optimized for lithium-ion and lithium-polymer

batteries.

The charger includes a current sensor for charging

control, user programmable current regulation, and

high accuracy voltage regulation. The charging current

parameters are configured by the UI tool. Reviving,

pre-charging, constant current and constant voltage

modes, and re-charging functions are included. The

maximum charging current is 350 mA. Figure 4-1 illus-

trates the charging curve of a battery.

FIGURE 4-1:

CHARGING CURVE

4.2

Voltage Monitoring

A 10-bit, successive approximation ADC (SAR ADC)

provides a dedicated channel for voltage level detec-

tion. The warning level can be programmed by using

the UI tool. The ADC provides a granular resolution to

enable the MCU to take control over the charging pro-

cess.

4.3

LED Driver

Two dedicated LED drivers control the LEDs.They pro-

vide enough sink current (16 step control and 0.35 mA

for each step), thus LEDs can be connected directly

with the BM62/64 module. LED settings can be config-

ured using the UI tool. Figure 4-2 illustrates the LED

drivers in the BM62/64 module.

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