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參數(shù)資料
| 型號： | bq2014H |
| 廠商： | Benchmark Technology Group |
| 英文描述： | Low-Cost NiCd/NiMH Gas Gauge IC(低價格NiCd/NiMHGas Gauge芯片) |
| 中文描述： | 低成本鎳鎘/鎳氫電池電量監(jiān)測計芯片（低價格鎳鎘/ NiMHGas計芯片） |
| 文件頁數(shù)： | 10/22頁 |
| 文件大?。?/td> | 185K |
| 代理商： | BQ2014H |
The return-to-one data bit frame consists of three dis-
tinct sections:
1.
The first section is used to start the transmission
by either the host or the bq2014H taking the HDQ
pin to a logic-low state for a period,t
STRH;B
.
2.
The next section is the actual data transmission,
where the data should be valid by a period, t
DSU;B
,
after the negative edge used to start communica-
tion. The data should be held for a period, t
DH;DV
,
to allow the host or bq2014H to sample the data bit.
3.
The final section is used to stop the transmission by
returning the HDQ pin to a logic-high state by at
least a period, t
SSU;B
, after the negative edge used
to start communication. The final logic-high state
should be until a period t
CYCH;B
, to allow time to en-
sure that the bit transmission was stopped prop-
erly. The timings for data and break communication
are given in the serial communication timing speci-
fication and illustration sections.
Communication with the bq2014H is always performed
with the bit transmitted first. Figure 5 shows an example
of a communication sequence to read the bq2014H NACH
register.
bq2014H Command Code and
Registers
The bq2014H status registers are listed in Table 8 and de-
scribed below. All registers are Read/Write in the bq2014H.
Caution:
When writing to bq2014H registers ensure
that proper data are written.
recommended.
A write-verify read is
Command Code
The bq2014H latches the command code when eight
valid command bits have been received by the bq2014H.
The command code contains two fields:
I
W/R bit
I
Command address
The W/R bit of the command code is used to select whether
thereceivedcommandisforareadorawritefunction:
The W/R values are
Command Code Bits
7
6
5
4
3
2
1
0
W/R
-
-
-
-
-
-
-
where W/R is
0
The bq2014H outputs the requested regis-
ter contents specified by the address por-
tion of command code.
1
The following eight bits should be written
to the register specified by the address por-
tion of command code.
The lower 7-bit field of the command code contains the
address portion of the register to be accessed:
Command Code Bits
7
6
5
4
3
2
1
0
-
AD6 AD5
AD4
AD3
AD2
AD1
AD0
(LSB)
Primary Status Flags Register (FLGS1)
The FLGS1 register (address = 01h) contains the pri-
mary bq2014H flags.
The
charge status
flag (CHGS) is asserted when a
valid charge rate is detected.
valid when V
SRO
> V
SRQ
. A V
SRO
of less than V
SRQ
or
discharge activity clears CHGS.
The CHGS values are
Charge rate is deemed
FLGS1 Bits
7
6
5
4
3
2
1
0
CHGS
-
-
-
-
-
-
-
where CHGS is
0
Either discharge activity detected or V
SRO
≤
V
SRQ
1
V
SRO
> V
SRQ
The
battery replaced
flag (BRP) is asserted whenever
the bq2014H is reset either by application of V
CC
or by
a serial port command. BRP is reset when either a valid
charge action increments NAC to be equal to LMD, or a
valid charge action is detected after the EDV1 flag is as-
serted. BRP = 1 signifies that the device has been reset.
The BRP values are
FLGS1 Bits
7
6
5
4
3
2
1
0
-
BRP
-
-
-
-
-
-
where BRP is
0
Battery is charged until NAC = LMD or dis-
charged until the EDV1 flag is asserted
1
bq2014H is reset
4-10
bq2014H
Preliminary
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| BQ2014HSNG4 | 功能描述:電池管理 NiCd/NiMH Gas Gauge 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 |
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