13892 datasheet(39/75 Pages) FREESCALE

39 / 75 page

Analog Integrated Circuit Device Data

Freescale Semiconductor

13892

FUNCTIONAL DESCRIPTION

INTRODUCTION

Because of an order from the United States International Trade Commission, BGA-packaged product lines and part numbers indicated here currently are not

available from Freescale for import or sale in the United States prior to September 2010: MC13892VK and MC13892VL in 139, 186 MAPBGA packages.

FUNCTIONAL DESCRIPTION

INTRODUCTION

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

Management).

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

Ω 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

Ω 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, the pin BATTFET must be floating. When

single path is implemented, it must be connected to ground.

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.

CFP AND CFM

Accumulated current filter cap plus and minus terminals

respectively. The coulomb counter will require a 10 µF output

capacitor connected between these pins to perform a first

order filtering of the signal across R1.

CHRGSE1B

An unregulated wall charger configuration can be built in

which case this pin must be pulled low. When charging

through USB, it can be left open since it is internally pulled up

to VCORE. The recommendation is to place an external FET

that can pull it low or left it open, depending on the charge

method.

CHRGLED

Trickle LED driver output 1. Since normal LED control via

the SPI bus is not always possible in the standalone

operation, a current sink is provided at the CHRGLED pin.

This LED is to be connected between this pin and

CHRGRAW.

GNDCHRG

Ground for charger interface.

13892 Datasheet(PDF) 39 Page - Freescale Semiconductor, Inc

13892 Datasheet(HTML) 39 Page - Freescale Semiconductor, Inc

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