DS2746G Просмотр технического описания (PDF) - Maxim Integrated

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DS2746G

Low-Cost 2-Wire Battery Monitor with Ratiometric A/D Inputs

Maxim Integrated 

Figure 5. Measurement Timing

DS2746 Low-Cost 2-Wire Battery Monitor

VOLTAGE MEASUREMENT

Battery voltage is measured at the VIN input with respect to VSS over a range of 0V to 4.997V and with a resolution

of 2.44mV. The result is updated every 660ms with the average voltage over the last 220ms and placed in the

VOLTAGE register in two’s compliment form. Voltages above the maximum register value are reported as 7FFFh.

Figure 6. Voltage Register Format

MSB—Address 0Ch

S 210 29 28 27 26 25 24

MSb

LSb

“S”: sign bit(s), “X”: reserved

LSB—Address 0Dh

23 22 21 20 X X X X

MSb

LSb

Units: 2.44mV

The input impedance of VIN is sufficiently large (>15MΩ) to be connected to a high impedance voltage divider in

order to support multiple cell applications. The pack voltage should be divided by the number of series cells to

present a single cell average voltage to the VIN input.

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