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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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