AD8280WASTZ Analog Devices Inc, AD8280WASTZ Datasheet - Page 16

• Manufacturer Part Number: AD8280WASTZ
• Description: Lithium Ion Battery Safety Monitor
• Manufacturer: Analog Devices Inc

Specifications of AD8280WASTZ

• Function: Battery Monitor
• Battery Type: Lithium-Ion (Li-Ion)
• Voltage - Supply: 6 V ~ 30 V
• Operating Temperature: -40°C ~ 105°C
• Mounting Type: Surface Mount
• Package / Case: 48-LQFP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

AD8280
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.
NOTES
1. PART IS CONFIGURED AS FOLLOWS:
GROUND
PART
MIDDLE PART IN DAISY CHAIN
ALARMS ARE SHARED
DEGLITCH TIME SET TO 0.0 SECONDS
NTC THERMISTOR INPUTS
6 CELL INPUTS
+
+
+
+
+
+
100nF
0.1µF
10kΩ
Z1
10nF
10µF
GROUND
VTOP
VCC
VCCS
LDO
LDOS
VIN6
VIN5
VIN4
VIN3
VIN2
VIN1
VIN0
VT1
VT2
VBOT2S
VBOT2
VBOT1S
VBOT1
PART
0.1µF
22pF
VTOPS
AIOUTOV AIOUTUV AIOUTOT
Figure 45. Typical Connections of the AD8280
AIINOV AIINUV
Rev. A | Page 16 of 24
AD8280
AIINOT
ENBO
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 (V
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.
ENBI
TESTO
TESTI
GND1 GND2
UV OV OT
AVOUTOV
AVOUTUV
AVOUTOT
ALRMSEL
DGT2
DGT1
DGT0
NPTC
SEL0
SEL1
TOP
BOT
REF
FB
REF
UV
0.1µF
TH
REF
), it is important that the
OV
REF
OT
2.2µF