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參數(shù)資料
| 型號： | bq2040 |
| 廠商： | Benchmark Technology Group |
| 英文描述： | Gas Gauge IC With SMBus Interface(氣體Gauge芯片（帶SMBus 接口）) |
| 中文描述： | 氣體計(jì)IC，帶有SMBus接口（氣體計(jì)芯片（帶的SMBus接口）） |
| 文件頁數(shù)： | 25/32頁 |
| 文件大?。?/td> | 189K |
| 代理商： | BQ2040 |
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25
bq2040
Description
EEPROM
Address
EEPROM
Hex
Contents
Example
Values
Notes
Low
Byte
High
Byte
Low
Byte
High
Byte
Digital filter
0x4d
96
0.30mV
Used to set the digital magnitude filter as described in
Table 2.
Represents the following: 3.2/sense resistor in ohms.
It is used by the bq2040 to scale the measured voltage
values on the SR pin in mA and mAh. This register
also compensates for variations in the reported sense
resistor value.
This packed field is the two’s complement of (52.73/x)
where x is the desired self-discharge rate per day (%)
at room temperature.
Voltage gain is packed as two units. For example, (R4
+ R5)/R4 = 7.09 would be stored as: whole number
stored in 0x57 as 7 and the decimal component stored
in 0x56 as 256 x 0.09 = 23(= 17h).
Should be programmed to 0.
Current integra-
tion gain
1
0x4e
40
0
3.2/0.05
Self-discharge rate
0x4f
2d
0.25%
Voltage gain
1
0x56
0x57
17
07
7.09
Reserved
EDVF charging
current
End of discharge
voltage 1
End-of-discharge
voltage final
Full charge
capacity
0x58
0x59
00
00
0
0x5a
0x5b
64
00
100mA
Contains the desired charge current below EDVF.
0x5c
0x5d
20
d1
12000mV
The value programmed is the two’s complement of the
threshold voltage in mV.
The value programmed is the two’s complement of the
threshold voltage in mV.
0x5e
0x5f
40
d4
11200mV
0x60
0x61
d0
07
2000mA
This value sets the initial estimated pack capacity.
t step
0x62
0f
20s
The
t step for
T/
t termination equals
320 - (byte value
20).
320s hold-off The hold-off time is 320 - (byte value
20).
181
Must be equal to 0xb5.
NA
Not currently used by the bq2040.
Hold-off time
0x63
00
EEPROM check 2 0x64
Reserved
b5
0x65
0x7f
Note:
1.
Can be adjusted to calibrate the battery pack.
Table 10. Example Register Contents (Continued)
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