13892 datasheet(32/161 Pages) FREESCALE

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Analog Integrated Circuit Device Data

Freescale Semiconductor

13892

FUNCTIONAL DESCRIPTION

FUNCTIONAL PIN DESCRIPTION

FUNCTIONAL DESCRIPTION

FUNCTIONAL PIN DESCRIPTION

CHARGER

CHRGRAW

1. Charger input. The charger voltage is measured through an ADC at this pin. The UVBUS pin must be shorted to CHRGRAW

in cases where the charger is being supplied from the USB cable. The minimum voltage for this pin depends on BATTMIN

threshold value (see Battery Interface and Control).

2. Output to battery supplied accessories. The battery voltage can be applied to an accessory by enabling the charge path for

the accessory via the CHRGRAW pin. To accomplish this, the charger needs to be configured in reverse supply mode.

CHRGCTRL1

Driver output for charger path FET M1.

CHRGCTRL2

Driver output for charger path FET M2.

CHRGISNS

Charge current sensing point 1. The charge current is read by monitoring the voltage drop over the charge current 100 m

sense resistor connected between CHRGISNS and BPSNS.

BPSNS

1. BP sense point. BP voltage is sensed at this pin and compared with the voltage at CHRGRAW.

2. Charge current sensing point 2. The charge current is read by monitoring the voltage drop over the charge current 100 m

sense resistor. This resistor is connected between CHRGISNS and BPSNS.

This pin is the application supply point, the input supply to the IC core circuitry. The application supply voltage is sensed

through an ADC at this pin.

BATTFET

Driver output for battery path FET M3. If no charging system is required or single path is implemented, the pin BATTFET must

be floating.

BATTISNS

Battery current sensing point 1. The current flowing out of and into the battery can be read via the ADC by monitoring the

voltage drop over the sense resistor between BATT and BATTISNS.

BATT

Battery positive terminal. Battery current sensing point 2. The supply voltage of the battery is sensed through an ADC on this

pin. The current flowing out of and into the battery can be read via the ADC by monitoring the voltage drop over the sense resistor

between BATT and BATTISNS.

BATTISNSCC

Accumulated current counter current sensing point. This is the coulomb counter current sense point. It should be connected

directly to the 0.020

Ω sense resistor via a separate route from BATTISNS. The coulomb counter monitors the current flowing in/

out of the battery by integrating the voltage drop over the BATTISNCC and the BATT pin.

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