AD8280 datasheet(16/24 Pages) AD

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AD8280

Rev. C | Page 16 of 24

APPLICATIONS INFORMATION

TYPICAL CONNECTIONS

Figure 45 is a block diagram of the AD8280 typical connections.

CELL INPUTS

The battery stack of six cells should be connected to VIN0 through

VIN6, with the highest potential connected to VIN6 and the lowest

to VIN0. The connections should be made through a low-pass filter

consisting of a 10 kΩ resistor and a 10 nF capacitor, as shown in

Figure 45. The lowest potential of the six-cell stack should also be

connected to VBOT1, VBOT1S, VBOT2, and VBOT2S as well,

whereas the highest potential should be connected through a

diode to VTOP and VTOPS. It is recommended that decoupling

capacitors of 0.1 μF and 10 μF be used at the VTOP pin.

TEMPERATURE INPUTS AND THERMISTOR

SELECTION

VT1 and VT2 are voltage inputs and are designed to work with

thermistors that are configured as resistor dividers, as shown

in Figure 45. The voltage at the top of the thermistor divider

should be the +5 V output of the LDO. The LDO pin can source

more current than the REF pin and is better suited to drive the

thermistor dividers.

If a voltage source other than that of the AD8280 LDO is used

to drive the thermistor bridge (VTH), it is important that the

VT1 and VT2 voltages be brought to 0 V when the AD8280 is

disabled or powered down because the VT1 and VT2 inputs

must be at 0 V when the LDO is also at 0 V.

VBOT1

VTOP

UV OV OT

ENBI

AD8280

VCC

REF

VT2

10kΩ

VBOT1S

VTOPS

2.2µF

10nF

SEL0

VCCS

0.1µF

SEL1

VIN6

VIN5

VIN4

VIN3

VIN2

VIN1

VIN0

VT1

VBOT2

VBOT2S

ENBO

LDO

LDOS

TESTO

TESTI

AIOUTOV AIOUTUV AIOUTOT

AIINOV AIINUV

AIINOT

AVOUTOV

AVOUTUV

AVOUTOT

DGT2

NPTC

GND1 GND2

TOP

BOT

ALRMSEL

DGT0

DGT1

100nF

0.1µF

10µF

PART

GROUND

PART

GROUND

NOTES

1. PART IS CONFIGURED AS FOLLOWS:

MIDDLE PART IN DAISY CHAIN

ALARMS ARE SHARED

DEGLITCH TIME SET TO 0.0 SECONDS

NTC THERMISTOR INPUTS

6 CELL INPUTS

22pF

Figure 45. Typical Connections of the AD8280

AD8280 Datasheet(PDF) 16 Page - Analog Devices

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