supplied handheld PC and portable product applications.
Its operating range is perfectly suited for single-cell Li-Ion
batteries. A precision coulomb counter integrates current
through a sense resistor between the battery’s positive
terminal and the load or charger. The measured charge
is stored in internal registers. An SMBus/I
2
C interface
accesses and configures the device.
The LTC2941 features programmable high and low
thresholds for accumulated charge. If a threshold is
exceeded, the device communicates an alert using either
the SMBus alert protocol or by setting a flag in the inter-
nal status register.
The LTC2941 requires only a single low value external
sense resistor to set the current range.
All registered trademarks and trademarks are the property of their respective owners.
Indicates Accumulated Battery Charge
and Discharge
High Accuracy Analog Integration
High Side Sense
1% Charge Accuracy
±50mV Sense Voltage Range
SMBus/I
2
C Interface
Configurable Alert Output/Charge Complete Input
2.7V to 5.5V Operating Range
Quiescent Current Less Than 100µA
Small 6-Pin 2mm × 3mm DFN and 8-Lead
MSOP Packages
APPLICATIONS
n
n
n
n
n
Low Power Handheld Products
Cellular Phones
MP3 Player
Cameras
GPS
TYPICAL APPLICATION
Total Charge Error vs
Differential Sense Voltage
CHARGER
SENSE
+
LTC2941
AL/CC
SDA
SENSE
–
SCL
GND
LOAD
0.1µF
R
SENSE
100m
2.0
1.5
CHARGE ERROR (%)
1.0
0.5
0
–0.5
–1.0
–1.5
–2.0
0.1
1
V
SENSE
(mV)
2941 TA01b
V
SENSE+
= 3.6V
I
2
C/SMBus
TO HOST
+
1-CELL
Li-Ion
2941 TA01a
10
100
Document Feedback
For more information
www.analog.com
1
Rev. C
LTC2941
ABSOLUTE MAXIMUM RATINGS
(Notes 1, 2)
Supply Voltage (SENSE
+
) ............................. –0.3V to 6V
SCL, SDA,
AL/CC
......................................... –0.3V to 6V
SENSE
–
.................................. –0.3V to (V
SENSE+
+ 0.3V)
Operating Ambient Temperature Range
LTC2941C ................................................ 0°C to 70°C
LTC2941I..............................................–40°C to 85°C
Storage Temperature Range .................... –65°C to 150°
PIN CONFIGURATION
TOP VIEW
SENSE
+
1
GND 2
SCL 3
7
6 SENSE
–
5
AL/CC
4 SDA
TOP VIEW
SENSE
+
GND
SCL
DNC
1
2
3
4
9
8
7
6
5
SENSE
–
AL/CC
SDA
DNC
DCB PACKAGE
6-LEAD (2mm
×
3mm) PLASTIC DFN
T
JMAX
= 150°C,
θ
JA
= 120°C/W
EXPOSED PAD (PIN 7), DO NOT CONNECT
MSE PACKAGE
8-LEAD PLASTIC MSOP
PIN 4, PIN 5 AND EXPOSED PAD (PIN 9), DO NOT CONNECT
ORDER INFORMATION
Lead Free Finish
TAPE AND REEL (MINI)
LTC2941CDCB#TRMPBF
LTC2941IDCB#TRMPBF
TUBE
LTC2941CMS8E#PBF
TAPE AND REEL
LTC2941CDCB#TRPBF
LTC2941IDCB#TRPBF
TAPE AND REEL
LTC2941CMS8E#TRPBF
PART MARKING*
LFKQ
LFKQ
PART MARKING*
LTGVY
PACKAGE DESCRIPTION
6-Lead (2mm × 3mm) Plastic DFN
6-Lead (2mm × 3mm) Plastic DFN
PACKAGE DESCRIPTION
8-Lead Plastic MSOP
TEMPERATURE RANGE
0°C to 70°C
–40°C to 85°C
TEMPERATURE RANGE
0°C to 70°C
LTC2941IMS8E#PBF
LTC2941IMS8E#TRPBF
LTGVY
8-Lead Plastic MSOP
–40°C to 85°C
TRM = 500 pieces.
Contact the factory for parts specified with wider operating temperature ranges. *The temperature grade is identified by a label on the shipping container.
Tape and reel specifications.
Some packages are available in 500 unit reels through designated sales channels with #TRMPBF suffix.
2
Rev. C
For more information
www.analog.com
LTC2941
ELECTRICAL CHARACTERISTICS
SYMBOL
V
SENSE+
I
SUPPLY
PARAMETER
Supply Voltage
Supply Current (Note 3)
Device On
Shutdown
Shutdown, V
SENSE+
≤ 4.2V
V
UVLO
Undervoltage Lockout Threshold
V
SENSE+
Falling, DCB Package
V
SENSE+
Falling, MSE Package
V
SENSE+
– V
SENSE–
l
l
l
l
The
l
denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. (Note 2)
CONDITIONS
MIN
2.7
70
TYP
MAX
5.5
100
2.5
1
2.5
2.45
2.6
2.6
2.7
2.7
±50
400
Prescaler M = 128 (Default),
R
SENSE
= 50mΩ
10mV ≤ |V
SENSE
| ≤ 50mV DC
10mV ≤ |V
SENSE
| ≤ 50mV, DC V
SENSE+
≤ 4.2V
1mV ≤ |V
SENSE
| ≤ 50mV DC (Note 7)
l
l
l
l
l
UNITS
V
µA
µA
µA
V
V
mV
kΩ
mAh
Power Requirements
Coulomb Counter
V
SENSE
Sense Voltage Differential Input Range
Differential Input Resistance, Across
SENSE
+
and SENSE
–
(Note 7)
q
LSB
TCE
Charge LSB (Note 4)
Total Charge Error (Note 5)
l
0.085
±1
±1.5
±3.5
2.75
2.85
2.95
0.3 •
V
SENSE+
2.8
2.9
3
2.85
2.95
3.05
0.7 •
V
SENSE+
0.4
1
10
1
%
%
%
V
V
V
V
V
µA
pF
µs
V
BAT
Alert
V
BAT
Alert Threshold
V
SENSE+
Falling, B[7:6] = 01
V
SENSE+
Falling, B[7:6] = 10
V
SENSE+
Falling, B[7:6] = 11
Digital Inputs and Digital Outputs
V
ITH
V
OL
I
IN
C
IN
t
PCC
Logic Input Threshold,
AL/CC,
SCL, SDA
Low Level Output Voltage,
AL/CC,
SDA I = 3mA
Input Leakage,
AL/CC,
SCL, SDA
Input Capacitance,
AL/CC,
SCL, SDA
Minimum Charge Complete (CC)
Pulse Width
Maximum SCL Clock Frequency
Bus Free Time Between STOP/START
Minimum Repeated START
Set-Up Time
Minimum Hold Time (Repeated)
START Condition
l
l
l
l
l
l
l
l
l
V
IN
= V
SENSE+
/2
(Note 7)
I
2
C Timing Characteristics
f
SCL(MAX)
t
BUF(MIN)
t
SU,STA(MIN)
t
HD,STA(MIN)
400
900
1.3
600
600
600
kHz
µs
ns
ns
ns
t
SU,STO(MIN)
Minimum Set-Up Time for
STOP Condition
For more information
www.analog.com
3
Rev. C
LTC2941
ELECTRICAL CHARACTERISTICS
SYMBOL
t
SU,DAT(MIN)
t
HD,DATO
t
Of
PARAMETER
Minimum Data Set-Up Time Input
Data Hold Time Output
Data Output Fall Time
(Notes 6, 7)
The
l
denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. (Note 2)
CONDITIONS
l
l
l
l
MIN
TYP
MAX
100
0
UNITS
ns
µs
µs
ns
t
HD,DATI(MIN)
Minimum Data Hold Time Input
0.3
20 + 0.1
• C
B
0.9
300
Note 1:
Stresses beyond those listed under Absolute Maximum Ratings
may cause permanent damage to the device. Exposure to any Absolute
Maximum Rating condition for extended periods may affect device
reliability and lifetime.
Note 2:
All currents into pins are positive, all voltages are referenced to
GND unless otherwise specified
Note 3:
I
SUPPLY
= I
SENSE+
+ I
SENSE–
Note 4:
The equivalent charge of an LSB in the accumulated charge
registers (C, D) depends on the value of R
SENSE
and the setting of the
internal prescaling factor M. It is calculated by:
When AD8066 is connected to +6V, the output waveform is very good and ideal, but when it is connected to +12V power supply, the chip is directly burned out. Why? The power supply range of the chip is ...
I have been studying USB for two weeks, but I still feel that some concepts are not very clear. I think the key is that I don't know what the host actually does. I have tried to capture some USB devic...
[align=left][size=26pt][size=2][b] ICON Health & Fitness Inc.[/b] ([url=http://www.iconfitness.com]www.iconfitness.com[/url]), one of the largest manufacturers and marketers of fitness equipment in th...
Please help me, experts. I want to make a frequency test circuit. If you know how to do it, please tell me. There is a cash reward. Specifically, I want to measure a signal with a frequency of about 1...
Our car was debugged in the afternoon before packaging. It was not very stable but it was able to run a lap. However, there was a problem with the wiring that night. After turning on the switch, the s...
Reflow soldering is a critical process in electronics assembly production, and the cleanliness of the reflow oven has a direct impact on product quality. Dust and residue accumulation within the ov...[Details]
The composition of the water heater
The water heater itself is divided into the following parts:
1. Water tank.
This is where the water heater is filled with water and where the wate...[Details]
Most cameras on the market use chips manufactured by Japanese companies like Sony, Sharp, Panasonic, and LG. South Korea now has the capability to produce chips, but the quality is somewhat inferio...[Details]
Cadence and NVIDIA Collaborate to Revolutionize Power Analysis Technology, Accelerating Development of Billion-Gate AI Designs
Cadence's new Palladium Dynamic Power Analysis applicat...[Details]
When we pick up an unfamiliar object, the first thing we want to know is what it actually does. A drive shaft, as the name suggests, is a shaft that transmits power. It's the transmission medium th...[Details]
With the global number of new energy vehicles expected to exceed 45 million by 2025, the performance boundaries of battery management systems are being reshaped.
Infineon Technologies
'
...[Details]
Relying on Zena CSS and Arm's complete partner ecosystem, we will accelerate the implementation of autonomous driving.
Close your eyes and imagine yourself getting into your car, rea...[Details]
Let’s first take a look at the development concept of the EVD series.
The EVD control module is specially developed for operation in extreme environments. Components that meet these requiremen...[Details]
With the rapid development of the automotive industry, automotive requirements for control, communication, and network management are becoming increasingly stringent. Hardware platforms based on 32...[Details]
Shenzhen RF Star's Bluetooth smart e-cigarette solution, by embedding a BLE module in the third-generation e-cigarette tube and coordinating it with the development of a smartphone APP, bring...[Details]
introduction
With the continuous development of electronic technology and the continuous upgrading of medical equipment, the demand for medical liquid infusion precision is becoming increasing...[Details]
Today, we'll discuss why contactors shouldn't be connected to the output terminals of VFDs. This is because if the contactor at the VFD output isn't engaged, it will only engage when the VFD starts...[Details]
This article describes how to achieve constant-pressure water supply through PID control using an Allen-Bradley PLC-5 processor in conjunction with a SAMI STAR inverter. To ensure safe and reliable...[Details]
Just how popular are humanoids? Let's take a look.
Humanoid robots' performance capabilities are driving booming orders.
Robots were undoubtedly a major highlight at the 2025 World A...[Details]
Central media outlets published an article: H20 is neither environmentally friendly, advanced, nor secure.
Recently, the new media account "Yuyuan Tantian" under China Central Television...[Details]
Analog electronics
京公网安备 11010802033920号
EEWORLD
