Coulomb Counter. DS2740 Datasheet


DS2740 Counter. Datasheet pdf. Equivalent


Part Number

DS2740

Description

High-Precision Coulomb Counter

Manufacture

Maxim Integrated

Total Page 16 Pages
Datasheet
Download DS2740 Datasheet


DS2740
www.maxim-ic.com
FEATURES
ƒ 15-Bit Bidirectional Current Measurement
(DS2740U)
ƒ 1.56μV LSB and ±51.2mV Dynamic
Range
ƒ 78μA LSB and ±2.56A Dynamic
Range with External 20mΩ Sense
Resistor (RSNS)
ƒ 156μA LSB and ±5.12A Dynamic
Range with External 10mΩ Sense
Resistor (RSNS)
ƒ 13-Bit Bidirectional Current Measurement
(DS2740BU)
ƒ 6.25μV LSB and ±51.2mV Dynamic
Range
ƒ 312μA LSB and ±2.56A Dynamic
Range with External 20mΩ Sense
Resistor (RSNS)
ƒ 625μA LSB and ±5.12A Dynamic
Range with External 10mΩ Sense
Resistor (RSNS)
ƒ Analog Input Filter (IS1, IS2) Extends
Dynamic Range for Pulse-Load
Applications
ƒ Current Accumulation Register
Resolution
ƒ 6.25μVhr (Both DS2740U and
DS2740BU)
ƒ 0.3125mAhr with External 20mΩ
RSNS
ƒ 0.6250mAhr with External 10mΩ
RSNS
ƒ Dallas 1-Wire® Interface
ƒ Unique 64-Bit Device Address
ƒ Standard and Overdrive Timings
(OVD)
ƒ Low Power Consumption:
ƒ Active Current: 65μA max
ƒ Sleep Current: 1μA max
DS2740
High-Precision Coulomb Counter
PIN CONFIGURATION
OVD 1
8 VDD
PIO
SNS
IS2
2
3
4
7 DQ
6 VSS
5 IS1
μMAX
(DS2740U, DS2740BU)
See Table 1 for Ordering Information.
See Table 2 for Detailed Pin Descriptions.
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
VSS - Device Ground, Current-Sense Resistor
Return
DQ - Data Input/Output
VDD - Power-Supply Input (2.7V to 5.5V)
1-Wire is a registered trademark of Dallas Semiconductor.
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DS2740
Table 1. ORDERING INFORMATION
DS2740
PART
MARKING
DESCRIPTION
DS2740U
D2740
15-Bit Current Resolution, 8-Pin μMAX
DS2740U+
D2740 (see note) 15-Bit Current Resolution, Lead-Free 8-Pin μMAX
DS2740U/T&R
D2740
15-Bit Current Resolution, 8-Pin μMAX, Tape-and-Reel
DS2740U+T&R
D2740 (see note)
15-Bit Current Resolution, Lead-Free 8-Pin μMAX, Tape-
and-Reel
DS2740BU
2740B
13-Bit Current Resolution, 8-Pin μMAX
DS2740BU+
2740B (see note) 13-Bit Current Resolution, Lead-Free 8-Pin μMAX
DS2740BU/T&R
2740B
13-Bit Current Resolution, 8-Pin μMAX, Tape-and-Reel
DS2740BU+T&R
2740B (see note)
13-Bit Current Resolution, Lead-Free 8-Pin μMAX, Tape-
and-Reel
Note: A “+” will also be marked on the package next to the pin 1 indicator.
DESCRIPTION
The DS2740 provides high-precision current-flow measurement data to support battery-capacity
monitoring in cost-sensitive applications. Current is measured bidirectionally over a dynamic range of 15
bits (DS2740U) or 13 bits (DS2740BU), with the net flow accumulated in a separate 16-bit register.
Through its 1-Wire interface, the DS2740 allows the host system read/write access to status and current
measurement registers. Each device has a unique factory-programmed 64-bit net address that allows it to
be individually addressed by the host system, supporting multibattery slot operation. The interface can be
operated with standard or overdrive timing.
Although the DS2740 is primarily intended for location on the host system, it is also suited for mounting
in the battery pack. The DS2740 and FuelPack™ algorithms, along with host measurements of
temperature and voltage, form a complete and accurate solution for estimating remaining capacity.
FuelPack is a trademark of Dallas Semiconductor.
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Features www.maxim-ic.com FEATURES ƒ 15-Bit Bidi rectional Current Measurement (DS2740U) ƒ 1.56μV LSB and ±51.2mV Dynamic Ra nge ƒ 78μA LSB and ±2.56A Dynamic Ra nge with External 20mΩ Sense Resistor (RSNS) ƒ 156μA LSB and ±5.12A Dynami c Range with External 10mΩ Sense Resis tor (RSNS) ƒ 13-Bit Bidirectional Curr ent Measurement (DS2740BU) ƒ 6.25μV L SB and ±51.2mV Dynamic Range ƒ 312μA LSB and ±2.56A Dynamic Range with Ext ernal 20mΩ Sense Resistor (RSNS) ƒ 62 5μA LSB and ±5.12A Dynamic Range with External 10mΩ Sense Resistor (RSNS) Analog Input Filter (IS1, IS2) Extend s Dynamic Range for Pulse-Load Applicat ions ƒ Current Accumulation Register R esolution ƒ 6.25μVhr (Both DS2740U an d DS2740BU) ƒ 0.3125mAhr with External 20mΩ RSNS ƒ 0.6250mAhr with External 10mΩ RSNS ƒ Dallas 1-Wire® Interfac e ƒ Unique 64-Bit Device Address ƒ St andard and Overdrive Timings (OVD) ƒ L ow Power Consumption: ƒ Active Current : 65μA max ƒ Sleep Current: 1μA max DS2740 High-Precision Coulomb Counter PIN CONFIGURATION OVD 1 .
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