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DS2740
 High-Precision Coulomb Counter
 
 
 
 
FEATURES
   15-Bit Bidirectional Current Measurement
(DS2740U)
   1.56糣 LSB and ?1.2mV Dynamic
Range
   78糀 LSB and ?.56A Dynamic
Range with External 20m?Sense
Resistor (R
SNS
)
   156糀 LSB and ?.12A Dynamic
Range with External 10m?Sense
Resistor (R
SNS
)
   13-Bit Bidirectional Current Measurement
(DS2740BU)
   6.25糣 LSB and ?1.2mV Dynamic
Range
   312糀 LSB and ?.56A Dynamic
Range with External 20m?Sense
Resistor (R
SNS
)
   625糀 LSB and ?.12A Dynamic
Range with External 10m?Sense
Resistor (R
SNS
)
   Analog Input Filter (IS1, IS2) Extends
Dynamic Range for Pulse-Load
Applications
   Current Accumulation Register
Resolution
   6.25糣hr (Both DS2740U and
DS2740BU)
   0.3125mAhr with External 20m?
R
SNS
 
   0.6250mAhr with External 10m?
R
SNS
 
   Dallas 1-Wire
?/DIV>
 Interface
   Unique 64-Bit Device Address
   Standard and Overdrive Timings
(OVD)
   Low Power Consumption:
   Active Current: 65糀 max
   Sleep Current: 1糀 max
 
 
www.maxim-ic.com
PIN CONFIGURATION 
 
 
PIO
V
DD
DQ
V
SS
IS1
IS2
 
 
 
 
 
 
 
 
 
 
 
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
V
SS
  - Device Ground, Current-Sense Resistor
Return
DQ - Data Input/Output
V
DD
  - Power-Supply Input (2.7V to 5.5V)
 
 
 
MAX
DS2740U DS2740BU
NS
VD
6
7
2
3
See Table 1 for Ordering Information.
See Table 2 for Detailed Pin Descriptions.
1-Wire is a registered trademark of Dallas Semiconductor.
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