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LTC1325CN Datasheet(PDF) 6 Page - Linear Technology |
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LTC1325CN Datasheet(HTML) 6 Page - Linear Technology |
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6 / 24 page  6 LTC1325 REG (Pin 1): Internal Regulator Output. The regulator provides a steady 3.072V to the internal analog circuitry and provides a temperature stable reference voltage for generating MCV, HTF, LTF and thermistor bias voltages with external resistors. Requires a 4.7 µF or greater bypass capacitor to ground. DOUT (Pin 2): TTL Data Output Signal for the Serial Interface. DOUT and DIN may be tied together to form a 3-wire interface, or remain separated to form a 4-wire interface. Data is transmitted on the falling edge of CLK (Pin 5). DIN (Pin 3): TTL Data Input Signal for the Serial Interface. The data is latched into the chip on the rising edge of the CLK (Pin 5). CS (Pin 4): TTL Chip Select Signal for the Serial Interface. CLK (Pin 5): TTL Clock for the Serial Interface. LTF (Pin 6): Minimum Allowable Battery Temperature Analog Input. LTF may be generated by a resistive divider between REG (Pin 1) and ground. MCV (Pin 7): Maximum Allowable Cell Voltage Analog Input. MCV may be generated by a resistive divider be- tween REG (Pin 1) and ground. HTF (Pin 8): Maximum Allowable Battery Temperature Analog Input. HTF may be generated by a resistive divider between REG (Pin 1) and ground. GND (Pin 9): Ground. FILTER (Pin 10): The external filter capacitor CF is con- nected to this pin. The filter capacitor is connected to the output of the internal resistive divider across the battery to reduce the switching noise while charging. In the gas gauge mode, CF along with an internal RF = 1k form a lowpass filter to average the voltage across the sense resistor. PIN FUNCTIONS SENSE (Pin 11): The Sense pin controls the switching of the 111kHz PWM constant current source in the charging mode. The Sense pin is connected to an external sense resistor RSENSE and the negative side of the battery. The charging loop forces the average voltage at the Sense pin to equal a programmable internal reference voltage VDAC. The battery charging current is equal to VDAC/RSENSE. In the gas gauge mode the voltage across the Sense pin is filtered by an RC network (RF and CF), amplified by an inverting gain of four, then multiplexed to the ADC so the average discharge current through the battery may be measured and the total charge leaving the battery calculated. VIN (Pin 12): General Purpose ADC Input. TAMB (Pin 13): Ambient Temperature Input. Connect to an external thermistor network. Tie to REG if not used. May be used as another general purpose ADC input. TBAT (Pin 14): Battery Temperature Input. Connect to an external NTC thermistor network. Tie to REG if not used. VBAT (Pin 15): Battery Input. An internal voltage divider is connected between the VBAT and Sense pins to normalize all battery measurements to one cell voltage. The divider is programmable to the following ratios: 1/1, 1/2, 1/3 . . . 1/15, 1/16. In shutdown and gas gauge modes the divider is disconnected. DIS (Pin 16): Active High Discharge Control Pin. Used to turn on an external transistor which discharges the battery. PGATE (Pin 17): FET Driver Output. Swings from GND to VDD. VDD (Pin 18): Positive Supply Voltage. 4.5V < VDD < 16V. |
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Similar Description - LTC1325CN |
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