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DS2781E Datasheet(PDF) 4 Page - Maxim Integrated Products |
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DS2781E Datasheet(HTML) 4 Page - Maxim Integrated Products |
4 / 30 page DS2781: Two-Cell Standalone Fuel Gauge IC 4 of 30 EEPROM RELIABILITY SPECIFICATION (VPLS = 2.5V to 10V, TA = -20°C to +70°C, unless otherwise noted. Typical values are at TA = +25°C.) PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS EEPROM Copy Time tEEC 15 ms EEPROM Copy Endurance NEEC TA = +50°C 50,000 cycles Note 1: All voltages are referenced to VSS. Note 2: Factory calibrated accuracy. Higher accuracy can be achieved by in-system calibration by the user. Note 3: Accumulation Bias register set to 00h. Current Offset Bias register set to 00h. NBEN bit = 0. Note 4: Parameters guaranteed by design. Note 5: Internal voltage regulator active. PIN DESCRIPTION PIN NAME FUNCTION 1 VB Internal Supply. Bypass to VSS with a 0.1µF capacitor. 2 VSS Device Ground. Connect directly to the negative terminal of the cell stack. Connect the sense resistor between VSS and SNS. 3 VIN Voltage Sense Input. The voltage of the battery pack is monitored through this input pin with respect to the VSS pin. 4 VPLS Power-Supply Input. Connect to the positive terminal of the battery pack through a decoupling network. 5 DQ Data Input/Output. 1-Wire data line. Open-drain output driver. Connect this pin to the DATA terminal of the battery pack. This pin has a weak internal pulldown (IPD) for sensing pack disconnection from host or charger. 6 OVD 1-Wire Bus Speed Control. Input logic level selects the speed of the 1-Wire bus. Logic 1 selects overdrive (OVD) and Logic 0 selects standard timing (STD). On a multidrop bus, all devices must operate at the same speed. 7 SNS Sense Resistor Connection. Connect to the negative terminal of the battery pack. Connect the sense resistor between VSS and SNS. 8 PIO Programmable I/O Pin. Can be configured as input or output to monitor or control user- defined external circuitry. Output driver is open drain. This pin has an weak internal pulldown (IPD). |
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