AD7280AWBSTZ Analog Devices Inc, AD7280AWBSTZ Datasheet - Page 8

• Manufacturer Part Number: AD7280AWBSTZ
• Description: IC BATT MON LI-ION AUTO 48LQFP
• Manufacturer: Analog Devices Inc
• Series: -r

Specifications of AD7280AWBSTZ

• Function: Battery Monitor, Over/Under Voltage Protection
• Battery Chemistry: Lithium-Ion (Li-Ion)
• Voltage - Supply: 8 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

AD7280A
PIN CONFIGURATION AND FUNCTION DESCRIPTIONS
Table 6. Pin Function Descriptions
Pin No.
1, 3, 5, 7, 9,
11, 13
2, 4, 6, 8,
10, 12
14
15
16
17
18
19
20
Mnemonic
VIN6 to VIN0
CB6 to CB1
MASTER
PD
V
V
V
DV
DGND
DD
SS
REG
CC
Description
Analog Input 6 to Analog Input 0. VIN0 should be connected to the base of the series-connected battery cells.
VIN1 should be connected to the top of Cell 1, VIN2 should be connected to the top of Cell 2, and so on (see
Figure 28 and Figure 29).
Cell Balance Output 6 to Cell Balance Output 1. These pins provide a voltage output that can be used to supply
the gate drive of an external cell balancing transistor. Each CBx output provides a 0 V or 5 V voltage output
referenced to the absolute amplitude of the negative terminal of the battery cell that is being balanced.
Voltage Input. Connect the MASTER pin of the AD7280A that is connected directly to the DSP/microprocessor
to the V
the MASTER pins of the remaining AD7280As in the daisy chain should be tied to their respective V
pins through 10 kΩ resistors.
Power-Down Input. This input is used to power down the AD7280A. When the AD7280A acts as a master, the
PD input is supplied from the DSP/microprocessor. When the AD7280A acts as a slave in a daisy chain, the
PD input should be connected to the PDhi output of the AD7280A immediately below it in potential in the
daisy chain.
Positive Power Supply Voltage for the High Voltage Analog Input Structure of the AD7280A. The supply must be
greater than the minimum voltage of 8 V. V
of the four, five, or six cell battery stacks that the AD7280A is monitoring. The maximum voltage that should
be applied between V
Negative Power Supply Voltage for the High Voltage Analog Input Structure of the AD7280A. This input should
be at the same potential as the AGND/DGND voltage.
Analog Voltage Output, 5.2 V. The internally generated V
the ADC core, is available on this pin for use external to the AD7280A. Place 1 μF and 100 nF decoupling
capacitors on the V
Digital Supply Voltage, 4.9 V to 5.5 V. The DV
For best performance, it is recommended that the DV
the voltage difference between them never exceeds 0.3 V, even on a transient basis. This supply should be
decoupled to DGND. Place 100 nF decoupling capacitors on the DV
connected to the V
Digital Ground. Ground reference point for all digital circuitry on the AD7280A. The DGND and AGND voltages
should ideally be at the same potential and must not be more than 0.3 V apart, even on a transient basis.
DD
supply pin through a 10 kΩ resistor. In an application with two or more AD7280As in a daisy chain,
VIN6
VIN5
VIN4
VIN3
VIN2
VIN1
CB6
CB5
CB4
CB3
CB2
CB1
10
12
11
1
4
5
6
7
8
9
2
3
REG
REG
48 47 46 45 44 43 42 41 40 39 38 37
13 14 15 16 17 18 19 20 21 22 23 24
DD
output.
pin.
PIN 1
and V
Figure 3. Pin Configuration
SS
Rev. 0 | Page 8 of 48
(Not to Scale)
AD7280A
TOP VIEW
is 30 V. Place 10 μF and 100 nF decoupling capacitors on the V
DD
CC
can be supplied directly from the cell with the highest potential
and AV
CC
CC
35
34
33
36
32
31
30
29
28
27
26
25
voltages should ideally be at the same potential.
and AV
REG
AUX3
AUX4
AUX5
AUX6
AUX
AGND
AV
V
ALERTlo
ALERT
SDO
SDOlo
DRIVE
CC
voltage, which provides the supply voltage for
TERM
CC
pins be shorted together to ensure that
CC
pin. The DV
CC
supply pin should be
DD
pin.
SS
supply