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参数资料
| 型号： | LTC2942CDCB-1#TRMPBF |
| 厂商： | LINEAR TECHNOLOGY CORP |
| 元件分类： | 电源管理 |
| 英文描述： | POWER SUPPLY SUPPORT CKT, PDSO6 |
| 封装： | 2 X 3 MM, LEAD FREE, PLASTIC, MO-229TBD, DFN-6 |
| 文件页数： | 15/16页 |
| 文件大小： | 230K |
| 代理商： | LTC2942CDCB-1#TRMPBF |
LTC2942-1
29421f
applicaTions inFormaTion
I2C/SMBus Interface
The LTC2942-1 communicates with a bus master using a
2-wire interface compatible with I2C and SMBus. The 7-bit
hard-coded I2C address of the LTC2942-1 is 1100100.
The LTC2942-1 is a slave-only device. Therefore the serial
clock line (SCL) is an input only while the serial data line
(SDA) is bidirectional. The device supports I2C standard
and fast mode. For more details refer to the I2C Protocol
section.
Internal Registers
TheLTC2942-1integratescurrentthroughasenseresistor,
measures battery voltage and temperature and stores the
results in internal 16-bit registers accessible via I2C. High
and low limits can be programmed for each measurement
quantity. The LTC2942-1 continuously monitors these
limits and sets a corresponding flag in its status register
when a limit is exceeded. If the alert mode is enabled, the
AL/CC pin pulls low.
The sixteen internal registers are organized as shown in
Table 1.
Table 1. Register Map
ADDRESS NAME REGISTER DESCRIPTION
R/W DEFAULT
00h
A
Status
R
See Below
01h
B
Control
R/W
3Ch
02h
C
Accumulated Charge MSB
R/W
7Fh
03h
D
Accumulated Charge LSB
R/W
FFh
04h
E
Charge Threshold High MSB
R/W
FFh
05h
F
Charge Threshold High LSB
R/W
FFh
06h
G
Charge Threshold Low MSB
R/W
00h
07h
H
Charge Threshold Low LSB
R/W
00h
08h
I
Voltage MSB
R
XXh
09h
J
Voltage LSB
R
XXh
0Ah
K
Voltage Threshold High
R/W
FFh
0Bh
L
Voltage Threshold Low
R/W
00h
0Ch
M
Temperature MSB
R
XXh
0Dh
N
Temperature LSB
R
XXh
0Eh
O
Temperature Threshold High
R/W
FFh
0Fh
P
Temperature Threshold Low
R/W
00h
R = Read, W = Write, XX = unknown
Status Register (A)
The status of the charge, voltage and temperature alerts
is reported in the status register shown in Table 2.
Table 2. Status Register A (Read only)
BIT NAME
OPERATION
DEFAULT
A[7] Chip Identification
0: LTC2942-1
1: LTC2941-1
0
A[6] Reserved
Not Used.
0
A[5] Accumulated Charge
Overflow/Underflow
Indicates that the value of the
accumulated charge hit either
top or bottom.
0
A[4] Temperature Alert
Indicates one of the
temperature limits was
exceeded.
0
A[3] Charge Alert High
Indicates that the accumulated
charge value exceeded the
charge threshold high limit.
0
A[2] Charge Alert Low
Indicates that the accumulated
charge value dropped below
the charge threshold low limit.
0
A[1] Voltage Alert
Indicates one of the battery
voltage limits was exceeded.
0
A[0] Undervoltage
Lockout Alert
Indicates recovery from
undervoltage. If set to 1, a
UVLO has occurred and the
content of the registers is
uncertain.
X
All status register bits except A[7] are cleared after being
read by the host, if the conditions which set these bits
have been removed.
As soon as one of the three measured quantities exceeds
the programmed limits, the corresponding bit A[4], A[3],
A[2] or A[1] in the status register is set.
Bit A[5] is set if the LTC2942-1’s accumulated charge
registers (ACR) overflows or underflows. In these cases,
the ACR stays at FFFFh or 0000h and does not roll over.
The undervoltage lockout (UVLO) bit of the status register
A[0] is set if, during operation, the voltage on SENSE+
pin drops below 2.7V without reaching the POR level.
The analog parts of the coulomb counter are switched off
while the digital register values are retained. After recov-
ery of the supply voltage the coulomb counter resumes
integrating with the stored value in the accumulated
charge registers but it has missed any charge flowing
while SENSE+ < 2.7V.
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| LTC2942IDCB#PBF | 制造商:Linear Technology 功能描述:BATTERY GAS GAUGE LI-ION 5.5V DFN-6 制造商:Linear Technology 功能描述:BATTERY GAS GAUGE, LI-ION, 5.5V, DFN-6 制造商:Linear Technology 功能描述:BATTERY GAS GAUGE, LI-ION, 5.5V, DFN-6, Battery Management Function:Fuel Gauge, Status Monitor, Battery Type:Li-Ion, Supply Voltage Min:2.7V, Supply Voltage Max:5.5V, Battery IC Case Style:DFN, No. of Pins:6, MSL:MSL 1 - Unlimited , RoHS Compliant: Yes 制造商:Linear Technology 功能描述:MS-System Monitor/Other, Cut Tape Battery Gas Gauge with Temperature & Voltage M |
| LTC2942IDCB#TRMPBF | 功能描述:IC FUEL/GAS GAUGE LI-ION 6DFN RoHS:是 类别:集成电路 (IC) >> PMIC - 电池管理 系列:- 其它有关文件:STC3100 View All Specifications 特色产品:STC3100 - Battery Monitor IC 标准包装:4,000 系列:- 功能:燃料，电量检测计/监控器 电池化学:锂离子（Li-Ion） 电源电压:2.7 V ~ 5.5 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:8-TSSOP，8-MSOP（0.118"，3.00mm 宽） 供应商设备封装:8-MiniSO 包装:带卷 (TR) 其它名称:497-10526-2 |
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| LTC2942IDCB-1#PBF | 制造商:Linear Technology 功能描述:BATTERY FUEL GAUGE LI-ION 5.5V DFN-6 制造商:Linear Technology 功能描述:IC, BATTERY FUEL GAUGE, LI-ION, 5.5V, DFN-6, Battery Management Function:Fuel Gauge, Charge Controller, Battery Type:Li-Ion, Supply Voltage Min:2.7V, Supply Voltage Max:5.5V, Battery IC Case Style:DFN, No. of Pins:6 , RoHS Compliant: Yes |
| LTC2942IDCB-1#PBF | 制造商:Linear Technology 功能描述:IC BATTERY FUEL GAUGE LI-ION 5.5V DFN-6 |
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