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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(jì)芯片（低價格鎳鎘/ NiMHGas計(jì)芯片） |
| 文件頁數(shù)： | 9/22頁 |
| 文件大?。?/td> | 185K |
| 代理商： | BQ2014H |
Error Summary
Capacity Inaccurate
The LMD is susceptible to error on initialization or if no
updates occur.
On initialization, the LMD value in-
cludes the error between the programmed full capacity
and the actual capacity.
This error is present until a
valid discharge occurs and LMD is updated. (See the
DCR description.) The other cause of LMD error is bat-
tery wear-out. As the battery ages, the measured capac-
ity must be adjusted to account for changes in actual
battery capacity.
A Capacity Inaccurate counter (CPI) is maintained and
incremented each time a valid charge occurs (qualified
by NAC; see the CPI register description). It is reset
whenever LMD is updated from the DCR. The counter
does not wrap around but stops counting at 255. The ca-
pacity inaccurate flag (CI) is set if LMD has not been up-
dated following 64 valid charges.
Current-Sensing Error
Table 6 shows the non-linearity and non-repeatability
errors associated with the bq2014H current sensing.
Table 7 illustrates the current-sensing error as a func-
tion of V
OS
.
A digital filter prevents charge and dis-
charge counts to the NAC register when V
SRO
is be-
tween V
SRQ
and V
SRD
.
Done Input
A charge-control IC or a microcontroller uses the DONE
input to communicate charge status to the bq2014H.
When the DONE input is asserted high on charge com-
pletion, the bq2014H sets NAC = LMD and VDQ = 1.
The DONE input should be maintained high as long as
the charge controller or microcontroller keeps the bat-
teries full;otherwise,the pin should be held low.
Communicating with the bq2014H
The bq2014H includes a simple single-pin (HDQ plus re-
turn) serial data interface. A host processor uses the in-
terface to access various bq2014H registers.
characteristics may be easily monitored by adding a sin-
gle contact to the battery pack. The open-drain HDQ
pin on the bq2014H should be pulled up by the host sys-
tem, or may be left floating if the serial interface is not
used.
Battery
The interface uses a command-based protocol, in which
the host processor sends a command byte to the
bq2014H. The command directs the bq2014H to either
store the next eight bits of data received to a register
specified by the command byte or output the eight bits
of data specified by the command byte. (See Figure 4.)
The communication protocol is asynchronous return-to-
one.
Command and data bytes consist of a stream of
eight bits that have a maximum transmission rate of
5K bits/sec. The least-significant bit of a command or
data byte is transmitted first.
enough that it can be implemented by most host proces-
sors using either polled or interrupt processing. Data
input from the bq2014H may be sampled using the
pulse-width capture timers available on some microcon-
trollers.
The protocol is simple
If a communication error occurs (e.g., t
CYCB
> 250
μ
s),
the bq2014H should be sent a BREAK to reinitiate the
serial interface. A BREAK is detected when the HDQ
pin is driven to a logic-low state for a time, t
B
or greater.
The HDQ pin should then be returned to its normal
ready-high logic state for a time, t
BR
. The bq2014H is
now ready to receive a command from the host proces-
sor.
9
V
OS
(
μ
V)
Sense Resistor
50
0.10
0.20
0.30
0.36
20
0.25
0.50
0.75
0.90
100
0.05
0.10
0.15
0.18
m
%
%
%
%
50
100
150
180
Table 7. V
OS
-Related Current Sense Error
(Current = 1A)
Symbol
Parameter
Typical
Maximum
Units
Notes
INL
Integrated non-linearity
error
Integrated non-
repeatability error
±
2
±
4
%
Add 0.1% per °C above or below 25°C
and 1% per volt above or below 4.25V.
Measurement repeatability given
similar operating conditions.
INR
±
1
±
2
%
Table 6. bq2014H Current-Sensing Errors
Preliminary
bq2014H
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