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DS2740

High-Precision Coulomb Counte r

www.maxim-ic.com

FEATURES PIN CONFIGURATION

15-Bit Bidirectional Current Measurement (DS2740U)
1 8 O VD DD 1.56 V LSB and ±51.2mV Dynamic Range
PIOV 7 2 3 DQV SNS 6 78 A LSB and ±2.56A Dynamic Range with External 20m
4 MAX
SS 5 Sense Resistor (R
IS1IS2 SNS ) 156 A LSB and ±5.12A Dynamic Range with External 10m ( DS2740U , DS2740BU ) Sense Resistor (R
SNS ) See Table 1 for Ordering Information. See Table 2 for Detailed Pin Descriptions. 13-Bit Bidirectional Current Measurement (DS2740BU) 6.25 V LSB and ±51.2mV Dynamic Range

PIN DESCRIPTION

312 A LSB and ±2.56A Dynamic Range with External 20m OVD - 1-Wire Bus Speed Select PIO - Programmable I/O Pin SNS - Sense Resistor Input IS2 - Current-Sense Input IS1 - Current-Sense Input V Sense Resistor (R
SNS ) 625 A LSB and ±5.12A Dynamic Range with External 10m Sense Resistor (R
SS SNS ) - Device Ground, Current-Sense Resistor Return DQ - Data Input/Output V Analog Input Filter (IS1, IS2) Extends Dynamic Range for Pulse-Load Applications Current Accumulation Register Resolution
DD - Power-Supply Input (2.7V to 5.5V) 6.25 Vhr (Both DS2740U and DS2740BU) 0.3125mAhr with External 20m R
SNS 0.6250mAhr with External 10m R
SNS Dallas 1-Wire
® Interface Unique 64-Bit Device Address Standard and Overdrive Timings (OVD) Low Power Consumption: Active Current: 65 A max Sleep Current: 1 A max
1-Wire is a registered trademark of Dallas Semiconductor. 1 of 16 051805