IS2064 datasheet(23/74 Pages) MICROCHIP

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Advance Information

DS60001409A - Page 23

IS2062/64

5.0

POWER MANAGEMENT UNIT

The IS2062/64 SoC has an integrated Power Manage-

ment Unit (PMU). The main features of the PMU are a

lithium-ion and lithium-polymer battery charger and

voltage regulation. A power switch is used to switch

over the power source between a battery and an adap-

tor. The PMU also provides current for driving LEDs.

5.1

Charging a Battery

The IS2062/64 SoC has a built-in battery charger which

is optimized for lithium-ion and lithium-polymer batter-

ies. The charger includes a current sensor for charging

control, user programmable current regulator and high

accuracy voltage regulator.

The charging current parameters are configured by

using the UI tool. Whenever an adaptor is plugged-in,

the charging circuit become activated. Reviving,

pre-charging, constant current and constant voltage

modes and re-charging functions are included. The

maximum charging current is 350 mA. Figure 5-1 illus-

trates the charging curve of a battery.

FIGURE 5-1:

BATTERY CHARGING CURVE

5.2

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.

5.3

LDO

A built-in Low-Dropout Regulator (LDO) is used to

convert the battery or adaptor power for power supply.

It also integrates hardware architecture to control the

power on/off procedure. The built-in programmable

LDOs provide power for codec and digital I/O pads.

Also, it is used to buffer the high input voltage from

battery or adapter. This LDO requires 1 μF bypass

capacitor.

5.4

Switching Regulator

The built-in programmable output voltage regulator can

convert the battery voltage to RF and baseband core

power supply. This converter has a high conversion

efficiency and a fast transient response.

5.5

LED Driver

The IS2062 SoC has two LED drivers and the IS2064

SoC has three LED drivers. The LED drivers provide

enough sink current (16-step control and 0.35 mA for

each step) and the LED can be connected directly to

the IS2062/64 SoC. The LED settings can be config-

ured using the UI tool.

Figure 5-2 illustrates the LED driver details.

IS2062_64.book Page 23 Monday, May 16, 2016 6:05 PM

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