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DS2786G+ Datasheet(PDF) 9 Page - Maxim Integrated Products |
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DS2786G+ Datasheet(HTML) 9 Page - Maxim Integrated Products |
9 / 22 page DS2786 Stand-Alone OCV-Based Fuel Gauge 9 of 22 TEMPERATURE MEASUREMENT The DS2786 uses an integrated temperature sensor to measure battery temperature with a resolution of 0.125°C. Temperature measurements are updated every 1760ms and placed in the Temperature Register in two’s complement form. The format of the Temperature Register is shown in Figure 7. The ITEMP bit in the Status/Configuration Register must be set to enable the internal temperature measurement instead of the AIN1 measurement. Figure 7. Temperature Register Format MSB—Address 0Ah LSB—Address 0Bh S 2 9 2 8 2 7 2 6 2 5 2 4 2 3 2 2 2 1 2 0 X X X X X MSb LSb MSb LSb “S”: sign bit(s), “X”: reserved Units: 0.125 C CURRENT MEASUREMENT In the Active mode of operation, the DS2786 continually measures the current flow into and out of the battery by measuring the voltage drop across a low-value current-sense resistor, RSNS, connected between the SNS and VSS pins. The voltage sense range between SNS and VSS is ±51.2mV. Note that positive current values occur when VSNS is less than VSS, and negative current values occur when VSNS is greater than VSS. Peak signal amplitudes up to 102mV are allowed at the input as long as the continuous or average signal level does not exceed ±51.2mV over the conversion cycle period. The ADC samples the input differentially and updates the Current Register every 880ms at the completion of each conversion cycle. Figure 8 describes the Current Measurement Register format and resolution for each option. Charge currents above the maximum register value are reported at the maximum value (7FFFh = +51.2mV). Discharge currents below the minimum register value are reported at the minimum value (8000h = -51.2mV). Every 1024th conversion, the ADC measures its input offset to facilitate offset correction to improve Current accuracy. Offset correction occurs approximately every 15 minutes. The resulting correction factor is applied to the subsequent 1023 measurements. During the offset correction conversion, the ADC does not make a measurement. The current measurement just prior to the offset conversion is displayed in the Current Register. Figure 8. Current Register Formats MSB—Address 0Eh LSB—Address 0Fh S 2 10 2 9 2 8 2 7 2 6 2 5 2 4 2 3 2 2 2 1 2 0 X X X X MSb LSb MSb LSb “S”: sign bit Units: 25 V/RSNS |
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