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AD7280 Datasheet(PDF) 20 Page - Analog Devices

Part # AD7280
Description  Lithium Ion Battery Monitoring System
PDF  33 Pages
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Manufacturer  AD [Analog Devices]
Direct Link  http://www.analog.com
Logo AD - Analog Devices

AD7280 Datasheet(HTML) 20 Page - Analog Devices

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AD7280
Preliminary Technical Data
Rev. PrD | Page 20 of 33
programmed through bits D3 and D2 of the ALERT register.
Table 8.ALERT Register settings
D7 to D6
D5 to D4
D3 to D0
AD7280 Action
00
XX
XXXX
No Alert signal generated
or passed [Default]
01
XX
XXXX
Generates static [High]
Alert signal to be passed
down the Daisy Chain
10
00
XXXX
Generates 100Hz Square
wave Alert signal to be
passed down the Daisy
Chain
10
01
XXXX
Generates 1kHz Square
wave Alert signal to be
passed down the Daisy
Chain
10
10
XXXX
Reserved
10
11
XXXX
Reserved
11
XX
XXXX
Passes Alert signal from
AD7280 at higher
potential in Daisy Chain
D7 to D4
D3 to D2
D1 to D0
AD7280 Action
XXXX
00
XX
Includes all 6 Voltage
channels in Alert
detection [Default]
XXXX
01
XX
Removes Vin5 from Alert
detection
XXXX
10
XX
Removes Vin5 & Vin4
from Alert detection
XXXX
11
XX
Reserved
XXXX
XX
00
Includes all 6
Temperature channels in
Alert detection [Default]
XXXX
XX
01
Removes VT5 from Alert
detection
XXXX
XX
10
Removes VT5 & VT3 from
Alert detection
The operation of the ALERT output can be verified by initiating
a Self-Test conversion. The self-test conversion will convert a
known voltage, 1.2V, which will trigger an ALERT output if the
under voltage fault threshold is higher than 1.25V. To test the
ALERT output the self-test should be initiated on the AD7280
furthest away from the DSP/µP. This allows the ALERT path
through each AD7280 to be verified. The remaining AD7280s
in the battery stack should be placed into software powerdown
to ensure that only the part which is converting the self-test
voltage may generate an ALERT output.



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