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AD7280 Datasheet(PDF) 13 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) 13 Page - Analog Devices

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Preliminary Technical Data
AD7280
Rev. PrD | Page 13 of 33
It is recommended that ferrite beads be included on the battery
connections to the VDD and VSS supplies. It is also
recommended that pull-down resistors should be used on the
ALERT and SDO outputs on each of the slave parts in the
AD7280 daisychain.
µC/µP
AD7280
VDD
SCLK
SDI
SDO
ALERT
Vin0
Vin1
Vin2
Vin3
Vin4
Vin5
VSS
CS
Vin6
VSS
0
VDD0
VDD0
10k
Ω
VDD
SDO
ALERT
Vin0
Vin1
Vin2
Vin3
Vin4
Vin5
VSS
MASTER
Vin6
VDD
Vin0
Vin1
Vin2
Vin3
Vin4
Vin5
VSS
Vin6
VDDn
PD
CNVST
VREG
4 WIRE SPI
INTERFACE
OPTIONAL
INTERFACE
PINS
10uF
0.1uF
DVCC
AVCC
VDRIVE
VREG
DVCC
AVCC
VDD(n-1)
SDO
ALERT
MASTER
VREG
10uF
DVCC
AVCC
VDRIVE
AD7280
AD7280
100nF
10k
Ω
100nF
10k
Ω
100nF
VDD1
VDD(n-1)
10uF
10uF
0.1uF
VDRIVE
VDD(n-1)
VDD0
0.1uF
0.1uF
0.1uF
0.1uF
0.1uF
0.1uF
10uF
0.1uF
0.1uF
10uF
0.1uF
1k
Ω
1k
Ω
1k
Ω
1k
Ω
100k
Ω
C1n
C2n
C3n
C4n
C11
C21
C31
C41
C10
C30
C40
VREF
CREF
10uF
0.1uF
VREF
CREF
10uF
0.1uF
10uF
0.1uF
10k
Ω
10k
Ω
10k
Ω
Figure 11. AD7280 Daisy Chain Configuration
VDRIVE
The AD7280 also has a VDRIVE feature to control the voltage at
which the serial interface operates. VDRIVE allows the ADC to
easily interface to both 3 V and 5 V processors. For example, in
the recommended configuration the AD7280 is operated with a
VCC of 5 V, however the VDRIVE pin could be powered from a 3 V
supply, allowing a large dynamic range with low voltage digital
processors.



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