1 of 15

033103

FEATURES

§ 15-Bit Bidirectional Current Measurement

(DS2740)

§ 1.56mV LSB and ±51.2mV Dynamic

Range

§ 78mA LSB and ±2.56A Dynamic

Range with External 20m

W Sense

§ 156mA LSB and ±5.12A Dynamic

Range with External 10m

W Sense

§ 13-Bit Bidirectional Current Measurement

(DS2740B)

§ 6.25mV LSB and ±51.2mV Dynamic

Range

§ 312mA LSB and ±2.56A Dynamic

Range with External 20m

W Sense

§ 625mA LSB and ±5.12A Dynamic

Range with External 10m

W Sense

§ Analog Input Filter (IS1, IS2) Extends

Dynamic Range for Pulse-Load

Applications

§ Current Accumulation Register

Resolution

§ 6.25mVhr (Both DS2740 and

DS2740B)

§ 0.3125mAhr with External 20mW

§ 0.6250mAhr with External 10mW

§ Dallas 1-Wire

§ Unique 64-Bit Device Address

§ Standard and Overdrive Timings

(OVD)

§ Low Power Consumption:

§ Active Current: 65mA max

§ Sleep Current: 1mA max

PIN CONFIGURATION

PIN DESCRIPTION

OVD- 1-Wire Bus Speed Select

PIO - Programmable I/O Pin

SNS - Sense Resistor Input

IS2 - Current-Sense Input

IS1 - Current-Sense Input

Return

DQ - Data Input/Output

DS2740

High-Precision Coulomb Counter

www.maxim-ic.com

mMAX

(DS2740U, DS2740BU)

PIO

DQ

IS1

IS2

SNS

OVD

6

8

7

5

3

1

2

4

See Table 1 for Ordering Information.

See Table 2 for Detailed Pin Descriptions.

1-Wire is a registered trademark of Dallas Semiconductor.