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參數(shù)資料
| 型號： | bq2052 |
| 廠商： | Benchmark Technology Group |
| 英文描述： | Gas Gauge IC for Lithium Primary Cells(Gas Gauge 芯片（用于鋰電池）) |
| 中文描述： | 氣體計IC（電量監(jiān)測計芯片（用于鋰電池），鋰原電池） |
| 文件頁數(shù)： | 12/18頁 |
| 文件大小： | 161K |
| 代理商： | BQ2052 |
In incremental mode (PROG
5
= L), the battery charge
state is displayed on pins SEG1–SEG4. The charge state
condition indicated by each segment is shown in Table 7.
Only the segment pin representing the present remain-
ing capacity is ON (low); all other segments are OFF
(high impedance). When DISP is pulled low, the display
is active for 10s.
Table 7. Incremental Display Mode
PROG
5
= L
SEG Pin ON
Remaining Capacity
90 -100%
50 - < 90%
20 - < 50%
< 20%
V
SB
< V
EDV1
SEG4
SEG3
SEG2
SEG1
SEG1—BLINK
In binary mode (PROG5 = H), the battery charge state is
displayed using only pins SEG1 and SEG2, with the re-
maining capacity indication defined as in Table 8
.
When
DISP is pulled low,the display is active for 4s.
Table 8. Binary Display Mode
PROG
5
= H
SEG 1
ON
ON
OFF
OFF
SEG 2
ON
OFF
ON
OFF
Remaining Capacity
70 -100%
40 - < 70%
10 - < 40%
< 10% or V
SB
< V
EDVF
In bar graph mode (PROG
5
= Z), the battery charge
state is displayed using pins SEG1 through SEG 5 ac-
cording to Table 9. When DISP is pulled low, the display
is active for 4s.
Microregulator
A micro-power source for the bq2052 can be inexpen-
sively built using a FET and an external resistor as
shown in Figure 1.
RBI Input
The RBI input pin should be used with a storage capaci-
tor or external supply to provide backup potential to the
internal bq2052 registers when V
CC
drops below 3.0V.
V
CC
is output on RBI when V
CC
is above 3.0V. If using
an external supply (such as the bottom series cell) as the
backup source, an external diode is required for isola-
tion.
Initialization
The bq2052 can be initialized by removing V
CC
and
grounding the RBI pin for 5s or by a command over the
serial port.
The serial port reset command requires
writing 78h to register CMDWD (address = 00h).
On initialization with PROG6 = H, the bq2052 sets the
registers as
FNAC = PFC
CACH = PFC
CACL = 0x00
RCAC = 0x64
FLGS1 = 0x90
12
bq2052
Preliminary
Table 9. Bar Graph Display Mode
PROG
5
= Z
SEG1
ON
ON
ON
ON
ON
BLINK
SEG2
ON
ON
ON
ON
OFF
OFF
SEG3
ON
ON
ON
OFF
OFF
OFF
SEG4
ON
ON
OFF
OFF
OFF
OFF
SEG5
ON
OFF
OFF
OFF
OFF
OFF
Remaining Capacity
80 - 100%
60 - < 80%
40 - < 60%
20 - < 40%
< 20%
VSB < VEDV1
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