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AD7280 Datasheet(PDF) 21 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) 21 Page - Analog Devices

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Preliminary Technical Data
AD7280
Rev. PrD | Page 21 of 33
REGISTER MAP
Table 9.
Register Name
Register
Address
Register
Data
Read/Write
Register
CELL VOLTAGE 1
0h
D11 to D0
Read Only
CELL VOLTAGE 2
1h
D11 to D0
Read Only
CELL VOLTAGE 3
2h
D11 to D0
Read Only
CELL VOLTAGE 4
3h
D11 to D0
Read Only
CELL VOLTAGE 5
4h
D11 to D0
Read Only
CELL VOLTAGE 6
5h
D11 to D0
Read Only
CELL TEMP 1
6h
D11 to D0
Read Only
CELL TEMP 2
7h
D11 to D0
Read Only
CELL TEMP 3
8h
D11 to D0
Read Only
CELL TEMP 4
9h
D11 to D0
Read Only
CELL TEMP 5
Ah
D11 to D0
Read Only
CELL TEMP 6
Bh
D11 to D0
Read Only
SELF TEST
Ch
D11 to D0
Read Only
CONTROL
Dh
Eh
D15 to D8
D7 to D0
Read/Write
Read/Write
OVER VOLTAGE
Fh
D7 to D0
Read/Write
UNDER VOLTAGE
10h
D7 to D0
Read/Write
OVER TEMP
11h
D7 to D0
Read/Write
UNDER TEMP
12h
D7 to D0
Read/Write
ALERT
13h
D7 to D0
Read/Write
CELL BALANCE
14h
D7 to D0
Read/Write
CB TIMER 1
15h
D7 to D0
Read/Write
CB TIMER 2
16h
D7 to D0
Read/Write
CB TIMER 3
17h
D7 to D0
Read/Write
CB TIMER 4
18h
D7 to D0
Read/Write
CB TIMER 5
19h
D7 to D0
Read/Write
CB TIMER 6
1Ah
D7 to D0
Read/Write
PD TIMER
1Bh
D7 to D0
Read/Write
READ
1Ch
D7 to D0
Read/Write
CELL VOLTAGE REGISTERS
Table 10. 12-Bit Registers
0h to 5h
D11 to D0
Read/Write
The CELL VOLTAGE registers store the conversion result from
each cell input. The conversion result is in 12-bit natural binary
format.
CELL TEMPERATURE REGISTERS
Table 11. 12-Bit Register
6h to Bh
D11 to D0
Read/Write
The CELL TEMP registers store the conversion result from each
temperature input. The conversion result is in 12-bit natural
binary format.
SELF-TEST REGISTER
Table 12. 12-Bit Register
Ch
D11 to D0
Read/Write
The SELF-TEST register stores the conversion result of the
ADC self-test. A self-test conversion is initiated by setting bits
D15 and D14 of the CONTROL register to 11. The user should
then pulse the CNVST input or complete a software convert
start through the CS input. The conversion result is in 12-bit
natural binary format.
CONTROL REGISTER
Table 13. 16-Bit Register
Dh
D15 to D8
Read/Write
Eh
D7 to D0
Read/Write
The CONTROL register is an 16-bit register that sets the
AD7280 Control modes.
Table 14. 16-Bit Register
D15 to D14
Select Conversion Inputs
00 = 6 Voltage & 6 Temp
01 = 6 Voltage & Temp 1,3 &5
10 = 6 Voltage only
11 = ADC Self Test
D13 to D12
Read Conversion Results
00 = 6 Voltage & 6 Temp
01 = 6 Voltage & Temp 1,3 &5
10 = 6 Voltage only
11 = No Read operation
D11
Conversion Start Format
0 = Falling edge of CNVST input
1 = Rising edge of CS
D10 to D9
Conversion Averaging
00 = Single Conversion only
01 = Average by 2
10 = Average by 4
11 = Average by 8
D8
Powerdown format
0 = Falling edge of PD input
1 = Software PD
D7
Software Reset
0 = Bring out of Reset
1= Reset AD7280
D6 to D5
Set Acquisition Tme
00 = Acquisition time 400ns
01 = Acquisition time 800ns
10 = Acquisition time 1.2us
11 = Acquisition time 1.6us
D4
Reserved; set to 1
D3
Thermistor Termination Resistor
0 = Function not in use
1 = Termination resistor connected
D2 to D0
Reserved; set to 1
Select Conversion Inputs
Bits D15 and D14 of the CONTROL register determine which
cell voltages and temperatures are converted following a
CNVST pulse or the setting of the CNVST bit, D11, in the
CONTROL register. The default value of D15 and D14 on
power up are 00.



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