AD7280 datasheet(23/33 Pages) AD

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Preliminary Technical Data

AD7280

Rev. PrD | Page 23 of 33

operating in daisy chain mode the ALERT configuration is set

on the AD7280 furthest away from the uP or DSP only. The

ALERT registers on the remaining AD7280s in the chain should

be programmed to pass the ALERT signal through the chain.

Each of these parts will pass the static or dynamic ALERT signal

through the chain or pull the signal low to indicate that an

over/under voltage or over/under temperature has occurred.

Table 21.ALERT Register settings

D7 to D6

D5 to D4

D3 to D0

AD7280 Action

XXXX

No Alert signal generated

or passed [Default]

XXXX

Generates static [High] Alert

signal to be passed down

the Daisy Chain

XXXX

Generates 100Hz Square

wave Alert signal to be

passed down the Daisy

Chain

XXXX

Generates 1kHz Square

wave Alert signal to be

passed down the Daisy

Chain

XXXX

Reserved

XXXX

Reserved

XXXX

Passes Alert signal from

AD7280 at higher potential

in Daisy Chain

D7 to D4

D3 to D2

D1 to D0

AD7280 Action

XXXX

Includes all 6 Voltage

channels in Alert detection

[Default]

XXXX

Removes Vin5 from Alert

detection

XXXX

Removes Vin5 & Vin4 from

Alert detection

XXXX

Reserved

XXXX

Includes all 6 Temperature

channels in Alert detection

[Default]

XXXX

Removes VT5 from Alert

detection

XXXX

Removes VT5 & VT3 from

Alert detection

CELL BALANCE REGISTER

Table 22. 8-Bit Register

14h

D7 to D0

Read/Write

The CELL BALANCE register determines the status of the 6

Cell Balance outputs. The six CB outputs are set by writing to

bits D7 to D2 of the Cell Balance register. The default value of

the Cell Balance register on power up is 0h.

Table 23. Cell Balance register settings

Set CB6 output

0 = output off

1 = output on

Set CB5 output

0 = output off

1 = output on

Set CB4 output

0 = output off

1 = output on

Set CB3 output

0 = output off

1 = output on

Set CB3 output

0 = output off

1 = output on

Set CB1 output

0 = output off

1 = output on

D1-D0

Reserved, set to 0

CB TIMER REGISTERS

Table 24. 8-Bit Register

15h to 1Ah

D7 to D0

Read/Write

The CB TIMER registers allow the user to program individual

ON times for each of the Cell Balance outputs. The AD7280

allows the user to set the CB Timer to a value between 0 and 30

minutes. The resolution of the CB Timer is 1 minute. The

default value of the CB TIMER registers on power up is 0h.

Table 25. CB Timer register settings

D7-D3

5-bit binary code to set CB timer to

value between 0 and 30 minutes

D2-D0

Reserved, set to 0

PD TIMER REGISTER

Table 26. 8-Bit Register

1Bh

D7 to D0

Read/Write

The PD TIMER register determines the elapsed time before the

AD7280 is automatically powered down. The AD7280 allows

the user to set the PD Timer to a value between 0 and 31

minutes. The resolution of the PD Timer is 1 minute. When

using the PD timer in conjunction with the CB timers the value

programmed to the PD Timer should exceed that programmed

to the CB Timer by at least 1 minute. The default value of the

PD TIMER registers on power up is 0h.

Table 27. PD Timer register settings

D7-D3

5-bit binary code to set PD timer to

value between 0 and 31 minutes

D2-D0

Reserved, set to 0

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