LTC2980 datasheet(13/26 Pages) LINER

13 / 26 page

dc2198af

DEMO MANUAL DC2198A

SETUP PROCEDURE FOR MULTI-BOARD ARRAYS

Multiple DC2198A boards can be combined to control

up to 64 independent power supplies. Four boards may

be cascaded. The number of boards is limited by an

I/O expander chip that has three address pins, allowing

8 different combinations. This setup demonstrates the

coordinatedfaultresponsesandaccuratetimebaseshared

across multiple LTC2980 devices.

Procedure:

1. Stack the boards side-by-side by plugging JP1 of one

board into JP2 of another DC2198A board.

2. Ensure different slave address settings for each of the

boards. The address of each board is set by the DIP

switch JP3 on the backside of the board. The setting

must be unique for each board in the array.

3. Pluginthe+12VVINpowerintooneoftheboardsasshown

in Figure 12. Only one +12V power source is allowed.

4. TheUSBtoI2C/SMBus/PMBusControllermay

be plugged into any board. If no devices show

up in the GUI, click the magnifying glass icon

to enumerate the I2C bus and find the addresses of the

parts. Go to step #2 to ensure that each board has a

unique DIP switch setting.

5. Since the individual CONTROL lines are connected

across the boards (CTRL is a common signal across

all boards in the array), make sure that all CONTROL

switches are set to the RUN position.

6. Re-launch LTpowerPlay. It will enumerate the entire

board array and build a representative system tree and

read all hardware settings into the GUI.

ATTENTION: Once the GUI has launched,

click the “RAM -> NVM” icon in the toolbar to

ensure that the slave addresses are retained

after a power off or reset. Otherwise you may lose

communication with the slaves after a power cycle or

reset event.

Figure 12. Array of Multiple DC2198A Demo Boards

LTC2980 Datasheet(PDF) 13 Page - Linear Technology