參數(shù)資料
型號： bq2945
廠商： Benchmark Technology Group
英文描述： Gas Gauge IC with SMBus Interface(Gas Gauge芯片（帶SMBus 接口）)
中文描述： 氣體計(jì)IC，帶有SMBus接口（電量監(jiān)測計(jì)芯片（帶的SMBus接口））
文件頁數(shù)： 20/32頁
文件大?。?/td> 256K
代理商： BQ2945
Control Pins 1 and 2 (CP
1
, CP
2
)
CP
1
and CP
2
are open drain outputs that are controlled
by host command. Since they are under the control of
the host, their use can be defined by the pack designer.
Some uses for these pins are charger control, control of
current path (charge FET, discharge FET, or fuse), or
special LED function. CP
1
and CP
2
are controlled by the
host writing a command to the battery’s Manufactur-
erAccess slave function.
Table 7 describes the com-
mands that are available to control CP
1
and CP
2
.
The CP
2
can also act as a digital input.
status can be monitored in bit 6 of the FLAGS2 register.
The logical
SBD Seal
The bq2945 address space can be “l(fā)ocked” to enforce the
SBS specified access to each command code. To lock the
address space, the bq2945 must be initialized with EE
0x3d set to 00h.
Once this is done, only commands
0x00-0x04 may be written. Attempting to write to any
other address will cause a “no acknowledge” of the data.
Reading will only be permitted from the command codes
listed in the SBD specification plus the five locations
designated as optional manufacturing functions 1—5
(0x2f,0x3c—0x3f).
Programming the bq2945
The bq2945 requires the proper programming of an ex-
ternal EEPROM for proper device operation. Each mod-
ule can be calibrated for the greatest accuracy, or gen-
eral “default” values can be used. An EV2200-45 pro-
gramming kit (interface board, software, and cable) for
an IBM-compatible PC is available from Unitrode.
The bq2945 uses a 24LC01 or equivalent serial EE-
PROM (capable of read operation to 2.0V) for storing the
various initial values, calibration data, and string infor-
mation. Table 1 outlines the parameters and addresses
for this information. Tables 10 and 11 detail the various
register contents and show an example program value
for an 2400mAh 4-series Li-Ion battery pack, using a
50m
sense resistor.
20
bq2945
Table 7. ManufactureAccess Commands
CMD (0x00) =
0x0505
0x051b
0x0536
0x054e
0x0563
0x057d
Action
CP
1
set to hi-Z
CP
1
set low
CP
2
set to hi-Z
CP
2
set low
CP
1
and CP
2
set to hi-Z
CP
1
and CP
2
set low
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
BQ294502 制造商:TI 制造商全稱:Texas Instruments 功能描述:Overvoltage Protection for 2-Series and 3-Series Cell Li-Ion Batteries
BQ294502DRVR 功能描述:電池管理 Overvltg Prot Device RoHS:否 制造商:Texas Instruments 電池類型:Li-Ion 輸出電壓:5 V 輸出電流:4.5 A 工作電源電壓:3.9 V to 17 V 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 封裝 / 箱體:VQFN-24 封裝:Reel
BQ294502DRVT 功能描述:電池管理 Overvltg Prot Device RoHS:否 制造商:Texas Instruments 電池類型:Li-Ion 輸出電壓:5 V 輸出電流:4.5 A 工作電源電壓:3.9 V to 17 V 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 封裝 / 箱體:VQFN-24 封裝:Reel
BQ294502EVM-033 功能描述:電源管理IC開發(fā)工具 bq294502 Eval Mod RoHS:否 制造商:Maxim Integrated 產(chǎn)品:Evaluation Kits 類型:Battery Management 工具用于評估:MAX17710GB 輸入電壓: 輸出電壓:1.8 V
BQ294504 制造商:TI 制造商全稱:Texas Instruments 功能描述:Overvoltage Protection for 2-Series and 3-Series Cell Li-Ion Batteries
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