CFA633-RDI-KS datasheet(49/88 Pages) CRYSTAIFONTZ

49 / 88 page

Crystalfontz America, Inc.

Data Sheet Release Date 2012/02/21

www.crystalfontz.com

CFA633-RDI-KS LCD Module (Hardware v2.0 / Firmware s2v1)

February 2012

Page 49

20 (0x14): Arbitrary DOW Transaction

The CFA633 can function as an RS-232 to Dallas One-Wire bridge. This command allows you to specify arbitrary

transactions on the One-Wire bus. One-Wire commands follow this basic layout:

<bus reset

//Required

<address_phase> //Must be "Match ROM" or "Skip ROM"

<write_phase>

//optional, but at least one of write_phase or read_phase must be sent

<read_phase>

//optional, but at least one of write_phase or read_phase must be sent

Please see APPENDIX A: CONNECTING A DS2450 1-WIRE QUAD A/D CONVERTER (Pg. 66) for an example of

using this command.

type: 0x14 = 2010

valid data_length is 2 to 16

data[0] = device_index (0-32 valid)

data[1] = number_of_bytes_to_read (0-14 valid)

data[2-15] = data_to_be_written[data_length-2]

If device_index is 32, then no address phase will be executed. If device_index is in the range of 0 to 31, and a

One-Wire device was detected for that device_index at power on, then the write cycle will be prefixed with a

"Match ROM” command and the address information for that device.

If data_length is two, then no specific write phase will be executed (although address information may be written

independently of data_length depending on the value of device_index).

If data_length is greater than two, then data_length-2 bytes of data_to_be_written will be written to the

One-Wire bus immediately after the address phase.

If number_of_bytes_to_read is zero, then no read phase will be executed. If number_of_bytes_to_read is

not zero then number_of_bytes_to_read will be read from the bus and loaded into the response packet.

The return packet will be:

type: 0x40 | 0x14 = 0x54 = 8410

data_length = 2 to 16

data[0] = device index (0-31 valid)

data[data_length-2] = Data read from the One-Wire bus. This is the same

as number_of_bytes_to_read from the command.

data[data_length-1] = One-Wire CRC

21 (0x15): Set Up Live Fan or Temperature Display

You can configure the CFA633 to automatically update a portion of the LCD with a “live” RPM or temperature reading.

Once the display is configured using this command, the CFA633 will continue to display the live reading on the LCD

without host intervention. The Set Up Live Fan or Temperature Display is one of the items stored by command 4 (0x04):

Store Current State As Boot State (Pg. 39), so you can configure the CFA633 to immediately display fan speeds or

system temperatures as soon as power is applied.

The live display is based on a concept of display slots. There are 8 slots, and each of the 8 slots may be enabled or

disabled independently.

Any slot may be requested to display any data that is available. For instance, slot 0 could display temperature sensor 3

in °C, while slot 1 could simultaneously display temperature sensor 3 in °F.

Any slot may be positioned at any location on the LCD, as long as all the digits of that slot fall fully within the display area.

It is legal to have the display area of one slot overlap the display area of another slot, but senseless. This situation should

be avoided in order to have meaningful information displayed.

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