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dc2313af

DEMO MANUAL DC2313A

software controL with LtpowerpLay

After modifying a register hit F12 on the keyboard to

update that register in the LTC2937 RAM.

Continue with the other channels:

SEQ_UP_POSITION_2 = 0x0007 : place channel 2 in

sequence position 7

SEQ_UP_POSITION_3 = 0x0003 : place channel 3 in

sequence position 3

SEQ_UP_POSITION_4 = 0x0001 : place channel 4 in

sequence position 1

SEQ_UP_POSITION_5 = 0x0002 : place channel 5 in

sequence position 2

SEQ_UP_POSITION_6 = 0x0004 : place channel 6 in

sequence position 4

3) Write each of the 6 SEQUENCE_DOWN_POSITION_n

registers to change their sequence positions:

SEQ_DOWN_POSITION_1 = 0x0001 : place channel 1

in sequence position 1

SEQ_DOWN_POSITION_2 = 0x0001 : place channel 2

in sequence position 1

SEQ_DOWN_POSITION_3 = 0x0007 : place channel 3

in sequence position 7

SEQ_DOWN_POSITION_4 = 0x0003 : place channel 4

in sequence position 3

SEQ_DOWN_POSITION_5 = 0x03FF : place channel 5

in sequence position 1023

SEQ_DOWN_POSITION_6 = 0x0004 : place channel 6

in sequence position 4

4) If you have not already written the GUI configuration

to RAM (using F12), then update all registers with the

Write All button

5) Initiate a sequence-up by writing ON_OFF_CON-

TROL[4:2] = 110.

Remember that we are programmed to ignore the

SEQUENCE UP/DOWN pushbutton.

6) Observe the modified sequence-up order as the sup-

plies come up.

The ON_OFF_CONTROL[7] bit becomes set

The STATUS_INFORMATION[11:10] bits cycle

through the sequence-up states

TheSEQ_POSITION_COUNT[9:0]bitscountthrough

the sequence-up states (1-8).

7) Initiate a sequence-down by writing ON_OFF_CON-

TROL[4:2] = 010.

TheSEQ_POSITION_COUNT[9:0]bitscountthrough

the sequence-down states (1-1023-0).

Notice that channel 5 is in the last sequence-down

position (1023). During sequence-down operation

the SEQUENCE POSITION COUNT will count up to

1023beforede-activatingEN5,thenroll-overtocount

0 before stopping.

Restore the EEPROM default register settings by

executing a RESTORE (0x2D) command. In LT-

powerPlay this command is issued by pressing the

RESTOREbutton,followedbythereadRAMregisters

button:

LTC2937 Datasheet(PDF) 13 Page - Linear Technology

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