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AD7280ABSTZ Datasheet(PDF) 18 Page - Analog Devices

Part # AD7280ABSTZ
Description  Lithium Ion Battery Monitoring System Cell balancing interface
PDF  48 Pages
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Manufacturer  AD [Analog Devices]
Direct Link  http://www.analog.com
Logo AD - Analog Devices

AD7280ABSTZ Datasheet(HTML) 18 Page - Analog Devices

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AD7280A
Rev. 0 | Page 18 of 48
VIN6
VREG
1µF
1µF
0.1µF
0.1µF
VIN5
VIN4
VIN3
VIN2
VIN1
VIN0
DVCC
AVCC
ALERT
CNVST
PD
SDO
SCLK
SDI
CS
VDRIVE
VREG
DVCC
AVCC
ALERT
SDO
MASTER
VREF
CREF
VDRIVE
AD7280A
AD7280A
10kΩ
10kΩ
10kΩ
1kΩ
100nF
100nF
10kΩ
10kΩ
100nF
100nF
10kΩ
10kΩ
FERRITE
100nF
10kΩ
100nF
100nF
VIN6
VIN5
VIN4
VIN3
VIN2
VIN1
VIN0
10kΩ
10kΩ
100nF
10kΩ
10kΩ
1kΩ
1kΩ
10kΩ
100nF
100nF
10kΩ
10kΩ
100nF
10kΩ
100nF
100nF
100nF
10µF
OPTIONAL INTERFACE PINS
4-WIRE SPI INTERFACE
1µF
1µF
0.1µF
0.1µF
22pF
22pF
22pF
22pF
22pF
22pF
22pF
22pF
22pF
22pF
22pF
22pF
22pF
22pF
100nF
100nF
10µF
VDD0
100nF
100nF
10µF
VDD(n – 1)
VDDn
VDD1
VDD0
VSS0
VDD0
VREG
DVCC
AVCC
ALERT
SDO
MASTER
VREF
CREF
VDRIVE
VIN6
VIN5
VIN4
VIN3
VIN2
VIN1
VIN0
10kΩ
10kΩ
100nF
10kΩ
10kΩ
1kΩ
1kΩ
10kΩ
100nF
100nF
10kΩ
10kΩ
100nF
10kΩ
100nF
100nF
1µF
1µF
0.1µF
0.1µF
VDD(n – 1)
VDDn
1kΩ
AD7280A
NOTES
ALL AD7280A DEVICES ON THE DAISY CHAIN
SHOULD BE LOCATED ON THE SAME PCB.
PLACE 22pF DAISY-CHAIN CAPACITORS
AS CLOSE AS POSSIBLE TO THEIR
TERMINATING PINS, THAT IS, CLOSE TO
THE PIN THAT HAS THE ARROW POINTING
TO IT ON THE DIAGRAM.
ROUTE VDD AND VSS TRACES TO ENSURE
A LOW IMPEDANCE CONNECTION BETWEEN THEM.
ROUTE DAISY-CHAIN TRACKS ON AN INNER
PCB LAYER.
ADD A VSS PLANE FROM THE UPPER SLAVE
DEVICE EXTENDED DOWN OVER AND UNDER
THE DAISY CHAIN TO ACT AS A SHIELD FOR
THE DAISY CHAIN.
PLACE AD7280A PARTS AS CLOSE TOGETHER
AS POSSIBLE ON THE BOARD TO MINIMIZE
THE LENGTH OF THE DAISY-CHAIN TRACKS.
FERRITES ON THE VDD LINES CAN BE REPLACED
WITH 20Ω RESISTORS EXCEPT IN THE CASE OF THE
VSS0 CONNECTION. IN THIS CASE, THE 20Ω RESISTOR
SHOULD BE REPLACED WITH A 0Ω RESISTOR.
1
2
3
4
5
6
7
2
3
4
5
6
7
DSP/MICRO-
PROCESSOR
Figure 29. AD7280A Daisy-Chain Configuration



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