DS2755E 查看數據表（PDF） - Dallas Semiconductor -> Maxim Integrated

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DS2755E

High-Accuracy Battery Fuel Gauge with Snapshot

Dallas Semiconductor -> Maxim Integrated 

Figure 2. FUNCTIONAL DIAGRAM

DS2755: High-Accuracy Battery Fuel Gauge with Snapshot

DQ

THERMAL

SENSE

VIN

IS2

1-WIRE

INTERFACE

AND

ROM ID

VOLTAGE

REFERENCE

M

U

ADC

X

-

+

LOCKABLE EEPROM

BLOCKS

SRAM

TEMPERATURE

VOLTAGE

CURRENT

ACCUM. CURRENT

COMPARATORS

STATUS / CONTROL

VDD

BIAS

TIMEBASE

PIO

IS1

SNS

chip ground

VSS

DETAILED PIN DESCRIPTION

PIN

NAME

DESCRIPTION

1

VIN

Battery voltage sense input. Voltage measurement performed on VIN input and

displayed in Voltage Register.

2

VSS

Device ground and current sense resistor connection. VSS attaches to battery end

of sense resistor.

3

PIO General purpose programmable I/O pin or optional interrupt output.

4

VDD Input supply: +2.5V to +5.5V input range. Bypass VDD to VSS with 0.1μF.

5

IS1 Current sense filter input 1

6

IS2 Current sense filter input 2

7

SNS Sense resistor connection. SNS attaches to pack end of current sense resistor.

8

DQ

Serial interface data I/O pin. Bidirection data transmit and receive at 16kbps or

143kbps. Optional interrupt output.

POWER MODES

The DS2755 has two power modes: Active and Sleep. While in Active mode, the DS2755 continuously measures

current, voltage and temperature. Current accumulation and monitoring for under voltage also occur continuously in

Active mode. In Sleep mode, the DS2755 ceases these activities. The DS2755 enters Sleep mode when PMOD =

1 AND either of the following occur:

ƒ the DQ line is low for longer than tSLEEP (minimum 2.1s)

(DQ low used indicate that the pack has been disconnected or that the host system is signaling the

DS2755 to enter Sleep mode.)

the UVEN bit in the Status Register is set to 1 AND the voltage on VIN drops below undervoltage threshold VUV for

tUVD

The DS2755 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 DS2755 is UVEN = PMOD = 0. The DS2755 defaults to Active mode when

power is first applied.

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