Datasheet

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4. I2C Addressing

LED-Warrior09 uses $20 (7 bit value, needs to be

shifted and extended by R/W bit: 0100 000R)

as the factory default I2C address.

Reassigning a different address is possible via I2C

commands.

4.1 I2C Commands

Commands are implemented via register addresses

that are transmitted as the first byte following the

I2C address byte. Reading from registers is done

by first doing a write transaction transmitting the

I2C address and the register number, then a restart

and a read transaction.

The register number is always reset to zero at the

end of a transaction, so reading without first

writing a register address always returns the

content of the status register.

4.2 Status register

The status register is one byte that contains the bus

status and command status flags:

7 - Bus Status, 0 = Bus OK, 1 = Bus fault

6 - Busy, 0 = ready, 1 = busy

5 - not used

4 - not used

3 - not used

2 - not used

1 - not used

0 - not used

Bus Status = 1 indicates that the bus is not

working, either another device is pulling it

permanently low or the bus is not connected.

Commands to register 1 will be ignored if the bus

is not working.

Busy = 1 indicates that the last command has not

yet been transmitted. Any new command sent to

has been transmitted and the busy bit is cleared.

4.3 Command register

The command register has two bytes which

directly contain the DALI command. DALI

commands 0 to 31 and direct arc power control are

supported.

4.3.1 DALI Commands

LW09 accepts the DALI comands 0 to 31 and the

direct arc power control command that directly sets

the power value for the lamp. The commands are

send by writing two bytes to register $01. LW09

will then transmit the command over the DALI bus

and indicate by the busy bit in the status register if

the DALI command has already been shipped.

The first byte contains the address information, the

second holds either the lamp power value or

command code.

4.3.2 DALI Address

The address byte format is used by the Command

7 - Y, 0 = short address, 1 = group address

6 - A5, Address bit 5

5 - A4, Address bit 4

4 - A3, Address bit 3

3 - A2, Address bit 2

2 - A1, Address bit 1

1 - A0, Address bit 0

0 - S, 0 = DAPC, 1 = Command

The S Bit selects if the second byte is the direct arc

power value (lamp power) or a command code. For

the config register this bit is ignored.

The addressing mode is selected by the Y bit. If

Y= 0 the A0..5 bits contain the 6 bit short address

of the device (0AAA AAAS). Short addresses are

direct addresses for up to 64 individual DALI

devices.

Group addressing can go to any of 16 groups of

devices or to all devices on the DALI bus

(broadcast). If Y = 1 and A4 and A5 are both zero

A0..3 contain the 4 bit group number to which the

command is addressed (100A AAAS).

A broadcast command sets all A bits to 1:

1111 111S This command goes to all devices on

the connected DALI bus.

Address values 1010 0000 through 1111 1101 are

invalid and will result in the command being

ignored.

In case of a direct arc power control command the

second byte directly sets the lamp power, where 0

is off and 254 is maximum, 255 is a mask value

that stops any fading at the current power level.

The functions of the other DALI commands are

described in the following section.

$00

$01

R/W Function

Status

Command

Data

1 Byte

2 Bytes

$08

$FE

R/W

Config

Set Addr

4 Bytes

2 Bytes

V1.0.0 April 8th 2015