n DescriptionVIN (Pin 1)VIN is the input power source. Connect to a wall apter.GND (Pin 2)GND is the connecon to system ground.STATUS (Pin 3)STATUS is an open-drain output indicating charging andinhibit states. The STATUS pin is pul LOW when thecharger is charging a batry. It will be turned into highimpnce when the charge current drops to IMIN. This highimpedance state will be latched until a recharge cycle anew charge cycle starts. When the charger is disabled, theSTATUS pin outputs high impedance.TIME (Pin 4)The TIME pin determines the oscillation period byconnecting a timing capacitor between this pin and GND.The oscillator also provides a time reference for the charger.GND (Pin 5)GND is the connection to system ground.EN (Pin 6)EN is the enable input. Connect the EN pin to HIGH todisable the charger. Connect the EN pin to LOW or leave itfloating to enable the charger. There is an internal 400kΩpull-down resistor at this pin.
V2P8 (Pin 7)This is a 2.8V reference voltage output. This pin provides a2.8V voltage source when the input voltage is above thePOR threshold and outputs 0V otherwise. The V2P8 pin be used as an indication for adapter presence.IREF (Pin 8)This is the charge current progming and monitoring pin.Connect a resistor between this pin and GND to set thecharge current during the constant current phase, as givenby Equation 1:Where RIREF is in kΩ.VSEN (Pin 9)VSEN is the remote voltage sense pin. Connect this pin asclose to the battery positive terminal as possible. If theVSEN pin is left floating, its voltage drops to 0V and thecharger operates in trickle mode.VBAT (Pin 10)VBAT is the connection to the battery. Typally a 10μFTantalum capacitor is needed for stability when there is nobattery atthed. When a battery is attached, only a 0.1μFceramic capacitor is required.