|Description||MULTICHEMISTRY BATTERY CHARGER CONTROLLER AND SYSTEM POWER SELECTOR|
|BQ24702PW Datasheet PDF : 37 Pages |
SLUS553E – MAY 2003 – REVISED OCTOBER 2007
Table 1. TERMINAL FUNCTIONS
I AC or adapter power detection
O AC or adapter power source selection output
I Negative differential input
I Positive differential input
O AC power indicator
I AC adapter power select
I Adapter current programming voltage
O Alarm output
I Depleted battery level
O Battery power source select output
I Battery charge regulation voltage measurement input to the battery-voltage gm amplifier
I External override to an internal precision reference
O Inverting input to the PWM comparator
I Charge enable
O Supply return and ground reference
O Battery current differential amplifier output
O Gate drive output
I Negative differential battery current sense amplifier input
I/O Positive differential battery current sense amplifier input
I Battery charge current programming voltage
I Operational supply voltage
O Voltage source to drive gates of the external MOSFETs
O Precision 5-V reference
I System (load) voltage input pin
ACDET: AC or adapter power detection. This input pin is used to determine the presence of the ac adapter.
When the voltage level on the ACDET pin is less than VACPRES, the bq24702/bq24703 is in sleep mode, the
PWM control is disabled, the BATDRV is driven low, and the ACDRV is driven high. This feature can be used to
automatically select battery as the system power source.
ACDRV: AC or adapter power source select output. This pin drives an external P-channel MOSFET used to
switch to the ac wall-adapter as the system power source. When the ACSEL pin is high while the voltage on the
ACDET pin is greater than VACPRES, the output ACDRV pin is driven low (VHSP). This pin is driven high (VCC)
when the ACDET is less than VACPRES.
ACN, ACP: Negative and positive differential inputs, respectively for ac-to-dc adapter current sense resistor.
ACPRES: This open-drain output pin is used to indicate the presence of ac power. A logic high indicates there is
a valid ac input. A low indicates the loss of ac power. ACPRES is high when the voltage level on the ACDET pin
is greater than VACPRES.
ACSEL: AC adapter power select. This input selects either the ac adapter or the battery as the power source. A
logic high selects ac power, while a logic low selects the battery.
ACSET: Adapter current programming voltage. This input sets the system current level at which dynamic power
management occurs. Adapter currents above this programmed level activate the dynamic power management
and proportionally reduce the available power to the battery.
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