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MAX17044X+ Datasheet(PDF) 8 Page - Maxim Integrated Products |
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MAX17044X+ Datasheet(HTML) 8 Page - Maxim Integrated Products |
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8 / 14 page  Compact, Low-Cost 1S/2S Fuel Gauges with Low-Battery Alert 8 VCELL Register Battery voltage is measured at the CELL pin input with respect to GND over a 0 to 5.00V range for the MAX17043 and 0 to 10.00V for the MAX17044 with reso- lutions of 1.25mV and 2.50mV, respectively. The A/D calculates the average cell voltage for a period of 125ms after IC POR and then for a period of 500ms for every cycle afterwards. The VCELL register requires 500ms to update after exiting Sleep mode. The result is placed in the VCELL register at the end of each conver- sion period. Figure 3 shows the VCELL register format. SOC Register The SOC register is a read-only register that displays the state of charge of the cell as calculated by the ModelGauge algorithm. The result is displayed as a percentage of the cell’s full capacity. This register automatically adapts to variation in battery size since the MAX17043/MAX17044 naturally recognize relative SOC. Units of % can be directly determined by observ- ing only the high byte of the SOC register. The low byte provides additional resolution in units 1/256%. The reported SOC also includes residual capacity, which might not be available to the actual application because of early termination voltage requirements. When SOC() = 0, typical applications have no remaining capacity. The first update occurs within 250ms after POR of the IC. Subsequent updates occur at variable intervals depending on application conditions. ModelGauge cal- culations outside the register are clamped at minimum and maximum register limits. Figure 4 shows the SOC register format. MODE Register The MODE register allows the host processor to send special commands to the IC (Table 2). Valid MODE reg- ister write values are listed as follows. All other MODE register values are reserved. VERSION Register The VERSION register is a read-only register that con- tains a value indicating the production version of the MAX17043/MAX17044. CONFIG Register The CONFIG register compensates the ModelGauge algorithm, controls the alert interrupt feature, and forces the IC into Sleep mode through software. The format of CONFIG is shown in Figure 5. CONFIG CONFIG is an 8-bit value that can be adjusted to opti- mize IC performance for different lithium chemistries or different operating temperatures. Contact Maxim for instructions for optimization. The power-up default value for CONFIG is 97h. MSB—ADDRESS 02h LSB—ADDRESS 03h 211 210 29 28 27 26 25 24 23 22 21 20 0 0 0 0 MSB LSB MSB LSB 0: BITS ALWAYS READ LOGIC 0 UNITS: 1.25mV FOR MAX17043 2.50mV FOR MAX17044 Figure 3. VCELL Register Format MSB—ADDRESS 04h LSB—ADDRESS 05h 27 26 25 24 23 22 21 20 2-1 2-2 2-3 2-4 2-5 2-6 2-7 2-8 MSB LSB MSB LSB UNITS: 1.0% Figure 4. SOC Register Format VALUE COMMAND DESCRIPTION 4000h Quick-Start See the Quick-Start description section. Table 2. MODE Register Commands |
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Similar Description - MAX17044X+ |
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