DS2740U 查看數據表（PDF） - Dallas Semiconductor -> Maxim Integrated

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DS2740U

High-Precision Coulomb Counter

Dallas Semiconductor -> Maxim Integrated 

Table 2. DETAILED PIN DESCRIPTION

DS2740

PIN SYMBOL

DESCRIPTION

OVD

1-Wire Bus Speed Control. Input logic level selects the speed of the 1-

1

Wire bus. Logic 1 selects overdrive (OVD) and Logic 0 selects standard

timing (STD). On a multidrop bus, all devices must operate at same

speed.

PIO

2

Programmable I/O Pin. Programmed as input or output through internal

registers. Open-drain output sufficient for LED or vibrator activation.

SNS

3

Current-Sense Resistor Input

IS2

4

Current-Sense Input. Connected to SNS through a 10kΩ resistor to

allow filtering of the current waveform by an external capacitor.

IS1

5

Current-Sense Input. Connected to VSS through a 10kΩ resistor to allow

filtering of the current waveform through an external capacitor.

VSS

6

Device Ground, Current-Sense Resistor Return. Connect directly to

the negative terminal of the battery cell.

Data I/O Pin. Operates bidirectionally with open-drain output driver.

DQ

7

Internal 1µA pulldown aids in sensing pack removal and sleep-mode

activation.

VDD

8

Power-Supply Input. Connects to system voltage supply or positive

terminal of battery cell.

Figure 2. APPLICATION EXAMPLE

2.7V to 5.5V

System Supply

Battery Pack

150

DATA 150

PIO 150

VDD

DQ

104

DS2740

PIO

OVD

**

SNS

IS2

System

GND

VSS

IS1

104

Negative

Battery

Pack

Return

RSNS

* 5.6V zener recommended for ESD protection when DATA or PIO

contacts exposed, such as a removable battery pack application

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