DS2751 查看數據表（PDF） - Maxim Integrated

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DS2751

Multichemistry Battery Fuel Gauge

Maxim Integrated 

Figure 2. APPLICATION EXAMPLE

PACK+

DS2751

DATA

PACK-

1kW

150W

5.6V

102

DS2751

VIN

VDD

SNS

PIO

DQ

VSS

IS2

IS1

150W

104

104

RSNS(1)

2.5V

1-CELL Li+

OR

3-CELL Ni

5.6V

PROTECTOR IC

(Li+/POLYMER

ONLY)

SNS

RSENSINT(2)

VSS

RKS

RKS

IS2

VOLTAGE

IS1

SENSE

DS2751

1) RSENS is present for external sense resistor configurations only.

2) RSENSINT is present for internal sense resistor configurations only.

POWER MODES

The DS2751 has two power modes: active and sleep. While in active mode, the DS2751 continuously

measures current, voltage, and temperature to provide data to the host system to support current

accumulation. In sleep mode, the DS2751 ceases these activities. The DS2751 enters sleep mode when

PMOD = 1 and either of the following occur:

§ the DQ line is low for longer than tSLEEP (2.2s) (pack disconnection).

§ the UVEN bit in the Status Register is set to 1 and the voltage on VIN drops below undervoltage

threshold VUV for tUVD (cell depletion)

The DS2751 returns to active mode when the DQ line is pulled from a low-to-high state and the voltage

on VIN is above VUV. The factory default for the DS2751 is UVEN = PMOD = 0.

The DS2751 defaults to active mode when power is first applied.

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