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 mΩ
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 mΩ
sense resistor. This resistor is connected between CHRGISNS and BPSNS.
BP
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.
13892
Analog Integrated Circuit Device Data
32
Freescale Semiconductor
FREESCALE [ Freescale ]
