DS2756(2006) Просмотр технического описания (PDF) - Maxim Integrated

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DS2756
(Rev.:2006)

High-Accuracy Battery Fuel Gauge with Programmable Suspend Mode

Maxim Integrated 

DS2756: High-Accuracy Battery Fuel Gauge with Programmable Suspend Mode

Figure 6. Accumulation Bias Register Format

Address 33h

S 26 25 24 23 22 21 20

MSb

“S”: sign bit

LSb

1.95mV/RSNS

VOLTAGE MEASUREMENT

The voltage register operates in two modes, normal and snapshot. In normal mode, the DS2756 continually

measures the voltage between pins VIN and VSS over a 0 to 4.75V range, and the Voltage Register is updated in

two’s-complement format every 3.4ms with a resolution of 4.88mV.

In snapshot mode, the Voltage register holds the voltage measured immediately following the snapshot trigger.

Normal voltage measurements resume after the snapshot value is obtained, however, the SNAP bit must be

cleared to re-enable normal mode reporting of voltage measurement to the Voltage register.

Voltages above the maximum register value are reported as the maximum value.

Figure 7. Voltage Register Format

MSB-Address 0Ch

S 29 28 27 26 25 24 23

MSb

LSb

LSB-Address 0Dh

22 21 20 X X X X X

MSb

LSb

Units: 4.88 mV

TEMPERATURE MEASUREMENT

The DS2756 uses an integrated temperature sensor to continually measure battery temperature. Temperature

measurements are updated in the Temperature Register every 220ms in two’s-complement format with a resolution

of 0.125°C over a ±127°C range. The Temperature Register format is shown in Figure 8.

Figure 8. Temperature Register Format

MSB-Address 18h

S 29 28 27 26 25 24 23

MSb

LSb

LSB-Address 19h

22 21 20 X X X X X

MSb

LSb

Units: 0.125°C

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