參數(shù)資料
型號(hào)： 27010
廠(chǎng)商： Texas Instruments, Inc.
英文描述： Li-Ion AND Li-Pol BATTERY GAS GAUGE IC FOR PORTABLE APPLICATIONS (bqJUNIOR)
中文描述： 鋰離子和鋰聚合物電池電量監(jiān)測(cè)計(jì)芯片的便攜式應(yīng)用（bqJUNIOR）
文件頁(yè)數(shù)： 19/30頁(yè)
文件大?。?/td> 337K
代理商： 27010
www.ti.com
Scaled EDV1 Threshold (SEDV1) — Address 0x78
This register contains the scaled value of the voltage when the battery has 6.25% remaining capacity at a very
light load. DEDV and EDVT coefficients can be programmed to reduce the EDVI threshold at heavier loads and
at cold temperatures. When the battery reaches this threshold during a valid discharge, the device learns the full
battery capacity, including the remaining unmeasured 6.25%. See the
bqJUNIOR Capacity Learning
section for
more information on the learning cycles of the device. To calculate the value to program, use the following
equation:
Initial Standby Load Current and EDV1 Temperature Compensation (ISLC/EDVT) – Address
0x79
Digital Magnitude Filter and Self-Discharge Values (DMFSD) — Address 0x7A
bq27010, bq27210
SLUS707B–APRIL 2006–REVISED JANUARY 2007
SEDV1 = Design EDV1 (mV) / 8 – 256
BIT 7
0
BIT 6
ISLC[2]
BIT 5
ISLC[1]
BIT 4
ISLC[0]
BIT 3
EDVT[3]
BIT 2
EDVT[2]
BIT 1
EDVT[1]
BIT 0
EDVT[0]
Name
The most significant nibble in this register contains the initial standby load current (ISLC) that is transferred to SI
on all resets. The gauge will use this initial value, but will learn the actual system standby current by averaging
in measured discharge currents above the DMF threshold and less than or equal to 2 times the ISLC value.
ISLC is programmed in units of 57.1
μ
V per bit.
A capacity learning cycle is disqualified if average current is less than or equal to 2 times the ISLC programmed
value.
The equation for programming ISLC is:
ISLC = Design Standby Current (mA) * R
S
(m
) / 57.1
μ
V, where R
S
is the sense resistor value.
The least significant nibble in this register contains the EDV1 temperature compensation (EDVT) coefficient. The
temperature compensation is impedance-based, so the resulting compensation is proportional to load current.
EDVT is programmed to increase the EDV1 rate compensation (programmed in the DEDV coefficient) by 0.78%
per count for each degree than temperature is below the T
off
threshold programmed in TCOMP. See the
GAF/DEDV section for the complete EDV1 compensation equation.
BIT 7
DMF[3]
BIT 6
DMF[2]
BIT 5
DMF[1]
BIT 4
DMF[0]
BIT 3
SD[3]
BIT 2
SD[2]
BIT 1
SD[1]
BIT 0
SD[0]
NAME
DMF[3:0]
Sets the digital magnitude filter threshold. See the
bqJUNIOR Digital Magnitude Filter
section for
more
information
on
the
function
of
the
DMF[3:0] = Design Threshold / 4.9
Sets the self-discharge rate % per day value at 25
°
C. The value to be programmed is:
SD[3:0] = 1.61 / Design SD
DMF.
The
value
to
be
programmed
is:
SD[3:0]
NAC is reduced with an estimated self-discharge correction to adjust for the expected self-discharge of the
battery. This estimation is performed only when the battery is not being charged. The rate programmed in
EEPROM for DMFSD determines the self-discharge when 20
°
C
≤
TEMP < 30
°
C. The self-discharge estimation
is doubled for each 10
°
C decade hotter than the 20-30
°
C decade, up to a maximum of 16 times the
programmed rate for TEMP
≥
60
°
C and is halved for each 10
°
C decade colder than the 20-30
°
C decade, down
to a minimum of 1/4th the programmed rate for TEMP < 0
°
C. The self-discharge estimation is performed by
reducing NAC by NAC / 512 at a time interval that achieves the desired estimation. If DMFSD is programmed
with 8 decimal, the self-discharge rate is 0.195% per day in the 20-30
°
C decade. This is accomplished by
reducing NAC by NAC / 512 (100 / 512 = 0.195%) a single time every 23.3 hours (0.195 * 24 / 23.3 = 0.2). If
temperature rises by 10
°
C, the 0.195% NAC reduction is made every 11.65 hours for a 0.4% per day reduction.
If TAPER[7] = 1, capacity aging is enabled, and there is an LMD reduction of 0.1% (Design Capacity / 1024)
every time there are 8 NAC self-discharge estimate reductions without charging the battery to full.
19
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