13892 datasheet(90/156 Pages) FREESCALE

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Analog Integrated Circuit Device Data

Freescale Semiconductor

13892

FUNCTIONAL DEVICE OPERATION

BATTERY INTERFACE AND CONTROL

BUILDING BLOCKS AND FUNCTIONS

The battery management interface consists of several building blocks and functions as depicted in the block diagram shown

in the previous paragraph. These building blocks and functions are described below while the charger operation is described in

the next section.

CHARGE PATH REGULATOR

The M1 and M2 are permanently used as a combined pass device for a super regulator, with a programmable output voltage

and programmable current limit.

The voltage loop consists of M1, M2, and an amplifier with voltage feedback taken from the BPSNS pin. The value of the sense

resistor is of no influence on the output voltage. The output voltage is programmable by SPI through VCHRG[2:0] bits.

Table 62. Charge Path Regulator Voltage Settings

000

3.800

001

4.100

010

4.150

011 (default)

4.200

100

4.250

101

4.300

110

4.375

111

4.450

The current loop is composed of the M1 and M2 as control elements, the external sense resistor, a programmable current limit,

and an amplifier. The control loop will regulate the voltage drop over the external resistor. The value of the external resistor

therefore is of influence on the charge current. The charge current is programmable by SPI through ICHRG[3:0] bits. Each setting

corresponds to a common use case. Software controlled pulsed charging can be obtained by programming the current

periodically to zero.

Table 63. Charge Path Regulator Current Limit Settings

0000

Off

0001

Standalone Charging Default for

precharging, USB charging, and LPB

0010

240

0011

320

0100

400

Advised setting for USB charging with

PHY active

0101

480

0110

560

Standalone Charging Default

0111

640

1000

720

1001

800

1010

880

1011

960

1100

1040

1101

1200

High Current Charger

1110

1600

High Current Charger

1111

Fully On – M3

Open

Externally Powered

VCHRG[2:0]

Charge Regulator Output Voltage (V)

ICHRG[3:0]

Charge Regulator

Current Limit (mA)

Specific Use Case

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