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www.cellwise-semi.com CW2017-DS V1.0
© 2018-2019 Cellwise Microelectronics 1
CW2017
Lithium-ion Fuel Gauge IC with ID Measurement Function
Features
System-Side or Pack-Side Fuel Gauging
±3% Maximum SOC Measurement Error
14-bit Sigma-Delta ADC for Cell Voltage,
Temperature and ID Resistor Measurement
Configurable Interrupt for Battery SOC Change,
High or Low Battery Temperature
No Offset Accumulation During Life Time
No Full-to-Empty Battery Learning Cycle
No Sense Resistor Required
Patented “FastCali” Fuel Gauging Algorithm
External Thermistor Supported
ID Resistor Measurement Supported
Ultra-low Power Consumption
Normal Mode 17A
Sleep Mode <1A
General I
2
C Interface
Tiny, Lead(Pb)-Free, TDFN 2mmx2mm-8L
Package
Applications
Smartphone
Tablet PCs
Handheld and Portable Devices
Lithium-ion or Lithium Polymer Battery Packs
General Description
The CW2017 is an ultra-compact, system-side or
pack-side, sensing resistor free, fuel gauging IC for
Lithium-ion(Li+) based batteries in handheld and
portable devices.
The CW2017 tracks the Li+ battery’s operation
conditions and performs state-of-the-art algorithm
to calculate the relative State-of-Charge (SOC) of
very different battery chemistry systems (LiCoOx,
polymer Li-ion, LiMnOx etc.).
The CW2017 includes a 14-bit Sigma-Delta ADC,
a precision voltage reference and build-in NTC
bias circuits. The IC allows users to eliminate the
expensive current sensing resistor which usually
occupies very large PCB area. The IC sends out
the alarm signal if the battery SOC level or the
temperature measured reaches the pre-
programmed threshold.
The CW2017 integrates the ID resistor sensing
feature. It can also be used as an alternative
sensing port.
The CW2017 uses a 2-wire I
2
C compatible serial
interface that operates in standard (100kHz) mode
or fast (400kHz) mode.
CW2017
2 © 2018-2019 Cellwise Microelectronics
Application Circuits
CW2017
Power
Supply
μP
Protection
IC
SCL
SDA
INT_N
VCC
VSS
VCELL
470
100
4.7K
1.0μF
1.0μF
System
Battery Pack
I2C
Master
INT
P+P+
P-
ID
NTC
VDD
ID
TS
Figure 1. Typical Application Diagram (System Side)
Figure1 is a typical application diagram of CW2017 used in system side, recommended external
components are marked on the figure.
CW2017
Power
Supply
μP
Protection
IC
SCL SDA
VCC
VSS
VCELL
VDD
ID
TS
470
100
1.0μF
1.0μF
System
Battery Pack
VM
VSS
VDD
I2C
P+
P-
100 100
100 100
4.7V 4.7V
INT_N
NTC
Figure 2. Typical Application Diagram (Pack Side)
Figure 2 is a typical application diagram of CW2017 used in pack side, recommended external components
are marked on the figure.
The CW2017 can be used in application with multi-battery connected in series or in parallel. Please refers
to the application note for more information or contacts support@cellwise-semi.com for more support.
CW2017
© 2018-2019 Cellwise Microelectronics 3
Ordering Information
PART
OPERATING
TEMPERATURE
PACKAGE
TOP MARK
CW2017AAAD
-40
o
C to 85
o
C
TDFN8
2017XXXX
Note: XXXX stands for the manufacture info.
Pin Configuration
TDFN Package Top view
2mm*2mm – 8pin
(Pad Side Down)
Pin Descriptions
PIN
NAME
DESCRIPTION
1
ID
ID measuring I/O. It can be left floating if unused.
2
VCELL
Battery voltage monitor I/O.
3
VDD
System power supply.
4
VSS
General purpose ground connection.
5
INT_N
Alarm signal for MCU interrupt controller. It can be left floating if unused.
6
TS
Thermistor measuring I/O.
7
SCL
Serial clock input.
8
SDA
Serial data input/output.
1 2 3 4
8 7 6 5
CW2017
CW2017
4 © 2018-2019 Cellwise Microelectronics
Type Number
CW2017XXXX
Package type D: TDFN 2mm*2mm-8L;
Parameter generation A: Standard firmware and parameter, A version
Standard Li+ battery application A: CellWise Li-Polymer profile
Function and revision A: A generation product
Absolute Maximum Ratings
VALUE
UNITS
MIN
MAX
Voltage respect to VSS
ID, CELL, VDD, INT_N, TS, SCL, SDA
-0.3
6
V
Output Current
INT_N, SDA
10
mA
Operation Temperature
T
A
-40
85
°C
Junction Temperature
T
J
-40
150
°C
Storage Temperature
T
STG
-50
150
°C
ESD
All pins. HBM model.
±2000
V
Moisture Sensitivity Level
MSL
Level 3
Caution:
Stresses beyond "Absolute Maximum Ratings" condition may cause permanent damage to the device.
These are stress ratings only and functional operation of the device at these or any other beyond those
indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum
rating conditions for extended periods may affect device reliability.
Recommended DC Operating Conditions
PARAMETER
DESCRIPTION
MIN
MAX
UNITS
Input Voltage Range
ID, VCELL, VDD, INT_N, TS, SCL, SDA
-0.3
5.5
V
I
2
C Clock Frequency
400
kHz
Operation Temperature
-40
85
℃
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