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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)： | 2/32頁 |
| 文件大?。?/td> | 189K |
| 代理商： | BQ2040 |
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Pin Descriptions
V
CC
Supply voltage input
ESCL
Serial memory clock
Output used to clock the data transfer be-
tween the bq2040 and the external non-
volatile configuration memory.
ESDA
Serial memory data and address
Bidirectional pin used to transfer address
and data to and from the bq2040 and the ex-
ternal nonvolitile configuration memory.
LED
1
–
LED
4
LED display segment outputs
Each output may drive an external LED.
V
SS
Ground
SR
Sense resistor input
The voltage drop (V
SR
) across pins SR and
V
SS
is monitored and integrated over time
to interpret charge and discharge activity.
The SR input is connected to the sense re-
sistor and the negative terminal of the
battery. V
SR
< V
SS
indicates discharge, and
V
SR
> V
SS
indicates charge. The effective
voltage drop, V
SRO
, as seen by the bq2040
is V
SR
+ V
OS
. (See Table 3.)
DISP
Display control input
DISP high disables the LED display. DISP
floating allows the LED display to be active
during charge if the rate is greater than
100mA. DISP low activates the display for
4 seconds.
SB
Secondary battery input
Monitors the pack voltage through a high-
impedance resistor divider network.
pack voltage is reported in the SBD register
function Voltage (0x09) and is monitored for
end-of-discharge voltage and charging volt-
age parameters.
The
PSTAT
Protector status input
Provides overvoltage status from the Li-Ion
protector circuit and can initiate a charge sus-
pendrequest.
SMBD
SMBus data
Open-drain bidirectional pin used to transfer
addressanddatatoandfromthebq2040.
SMBC
SMBus clock
Open-drain bidirectional pin used to clock
the data transfer to and from the bq2040.
REF
Reference output for regulator
REF provides a reference output for an op-
tional FET-based micro-regulator.
V
OUT
Supply output
Supplies power to the external EEPROM con-
figuration memory.
2
bq2040
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