参数资料
| 型号： | AD8280WASTZ-RL |
| 厂商： | Analog Devices Inc |
| 文件页数： | 15/24页 |
| 文件大小： | 0K |
| 描述： | IC LI-ION BATT MON 48LQFP |
| 标准包装： | 2,000 |
| 功能： | 电池监控器 |
| 电池化学： | 锂离子（Li-Ion） |
| 电源电压： | 6 V ~ 30 V |
| 工作温度： | -40°C ~ 105°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 48-LQFP |
| 供应商设备封装： | 48-LQFP（7x7） |
| 包装： | 带卷 (TR) |
| 配用： | AD8280-EVALZ-ND - BOARD EVAL FOR AD8280 |
AD8280
THEORY OF OPERATION
is a threshold monitor that can be used to monitor up to six cell
voltages and two temperature voltages. The part can also be used
in a daisy-chain configuration to monitor as many cells as required.
The benefit of the daisy-chain configuration is that isolation is
required to bring the alarm signal away from the high voltage
environment on only the bottom part of the chain, reducing
system cost and minimizing the board space required.
The part also contains its own LDO and reference. The LDO
can be used to drive external components such as thermistors
or isolators, whereas the reference can be used with the voltage
dividers to establish the trip points.
The AD8280 has the following unique features and capabilities:
? Three, four, five, or six cells can be monitored.
? Negative or positive temperature coefficient thermistors
The cell and temperature voltage inputs are connected to the part
using the VIN0 through VIN6 inputs and the VT1 and VT2 inputs,
respectively. Because the six-cell stack voltage can be up to 30 V,
the input voltages are level-shifted and referenced to the lowest
potential (part ground or VBOTx) of the AD8280. These voltages
are then input into window comparators and compared to trip
points set by external resistor dividers.
If the cell or temperature voltage inputs exceed or fall below the
selected trip points, an alarm, in the form of a digital voltage level,
changes state at the voltage output (AVOUTxx) of the part. The
alarm state also exists in the form of a current output (AIOUTxx)
used to communicate to the other devices when multiple parts
are used in a daisy-chain configuration.
The part contains programmable deglitching circuitry to ensure
that transient voltages appearing at the cell inputs are ignored.
OT
?
?
?
can be used.
Multiple parts can be configured in a daisy chain to monitor
hundreds of cells. Information about the status of the alarms
on the entire daisy chain, as well as input signals that enable
the part and initiate self-test, are all communicated via the
bottom, or master, part in the chain.
Alarm outputs for overvoltage, undervoltage, and overtemp-
erature status can be shared, with each output indicating
the same status for any of the occurring alarm conditions,
or the alarm outputs can function as separate entities with
each indicating the status of the specific condition.
An extensive self-test feature ensures that the internal
components are functioning correctly. The self-test is
initiated upon request to the TESTI pin.
VTOP LDO
LDOS REF
FB
UV
OV
AIINOV AIINUV AIINOT ENBO
TESTO
VTOPS
DGT0
VBOT2
VBOT2S
LDO
REF
LEVEL
SHIFTER
DGT1
DGT2
VBOT1
GND2
VBOT1S
VIN6
VIN5
LEVEL
SHIFTER
C6O
C6U
DE-
GLITCHING
DE-
GLITCHING
I/V
CONVERTER
SELF-
TEST
GENERATOR
GND1
VCC
VCCS
TOP
VIN4
VIN3
VIN2
BOT
SEL0
VIN1
C1O
DE-
GLITCHING
ALARM
LOGIC
SEL 1
VIN0
LEVEL
SHIFTER
C1U
DE-
GLITCHING
AVOUTOV
AVOUTUV
VT1
VT2
CT1
CT2
DE-
GLITCHING
DE-
GLITCHING
V/I
CONVERTER
AVOUTOT
NPTC
AD8280
ALRMSEL
OT
OT
AIOUTOV
AIOUTUV
AIOUTOT
ENBI
TESTI
Figure 44. Functional Block Diagram
Rev. C | Page 15 of 24
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