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DS2751-025 Datasheet(PDF) 9 Page - Maxim Integrated Products |
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DS2751-025 Datasheet(HTML) 9 Page - Maxim Integrated Products |
9 / 19 page DS2751 9 of 19 Figure 4. CURRENT ACCUMULATOR FORMAT MSB—Address 10 LSB—Address 11 S 214 213 212 211 210 29 28 27 26 25 24 23 22 21 20 MSb LSb MSb LSb Units: 0.25mAhrs for internal sense resistor 6.25 mVhrs for external sense resistor CURRENT OFFSET COMPENSATION Current measurement and the current accumulation are both internally compensated for offset on a continual basis minimizing error resulting from variations in device temperature and voltage. Additionally, a constant bias can be utilized to alter any other sources of offset. This bias resides in EEPROM address 33h in two’s-complement format and is subtracted from each current measurement. The current offset bias is applied to both the internal and external sense resistor configurations. The factory default for the current offset bias is a value of 0. Figure 5. CURRENT OFFSET BIAS Address 33 S 26 25 24 23 22 21 20 MSb LSb Units: 0.625mA for internal sense resistor 15.625 mV for external sense resistor VOLTAGE MEASUREMENT The DS2751 continually measures the voltage between pins VIN and VSS over a 0 to 4.5V range. The Voltage Register is updated in two’s-complement format every 3.4ms with a resolution of 4.88mV. Voltages above the maximum register value are reported as the maximum value. The Voltage Register format is shown in Figure 6. Figure 6. VOLTAGE REGISTER FORMAT MSB—Address 0C LSB—Address 0D S 29 28 27 26 25 24 23 22 21 20 X X X X X MSb LSb MSb LSb Units: 4.88 mV |
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