W2RF004RM Datasheet, PDF (4/10 Pages) Omron Electronics LLC – Most Suitable IC for Controlling LED Effects within Applications

Operation
■ Functional Overview
Receiving Commands
The IC recieves commands with two-wire serial communication to control 9 LED lines. Commands are received in a 40-bits-per-command com-
munication format.
Gradation Control
The lighting of the 9 LED lines is controlled individually or by group with 16-level lighting gradation and 32-level lighting speed. The exponential
control of output duty cycle allows lighting gradation that matches the human visual characteristics. In addition, the specification of lighting speed
allows fade-in and fade-out with up to 1,024 levels.
Number of Control Lines
The IC has two device address lines, each of which can be configured in seven ways by terminal configuration. This provides up to 49 patterns of
device address configuration, allowing up to 441 lines to be controlled on the same communication line. Two device address lines can be combined
to configure a device group.
■ Communication Specifications
Input signals to SDA-I and SCL-I are input via the filter circuit (0.1μs delay) to the communication circuit. An SDA-I signal that is input to the com-
munication circuit is taken in as serial data at the rising edge of an SCL-I signal. When serial data is received in a different format from the com-
munication format, the data will be invalid.
When the START signal, “111111111” is detected, the communication circuit takes in data as new serial data, whether it is on stand-by or in the
middle of intake of serial data.
Input signals to SDA-I and SCL-I will be output via the asynchronous buffer to SDA-O and SCL-O without going through the filter circuit.
Communication Format
bit
SCL-I
SDA-I
Name
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40
1111 11 1110 00
0
START
Device Device
Device
ID address A address B
Device selection data
dvc_dat[7:0]
Output address
Control data
ctrl_dat[6:0]
0
0 XX X
Lighting
Lighting
speed
gradation
END
Lighting data
light_dat[8:0]
Description of Communication Format
Device Selection Data
Control Data
Device ID
Device Address A
Device Address B
Control
Lighting Data
Output Address
Lighting Speed
Lighting Gradation
Device-specific ID (Fixed to “00” for this IC)
Specified with the ADRA0 to 2 terminals
Specified with the ADRB0 to 2 terminals
Specifies control
(data saving / immediate reflection)
Specifies the terminal to output
(Individual specification and collective specification are possible)
Specifies changing speed of free-running gradation control (32 levels)
Specifies the brightness of lighting (16 levels)
■ Control Command
Device Selection Data (8 bits)
Device ID
0
0
ADRA2
Device selection data dvc_dat (7:0)
Device Address A
ADRA1
ADRA0
ADRB2
Device Address B
ADRB1
ADRB0
The device ID is fixed. The correspondence between the device addresses A and B and the setting terminals ADRA0 to 2 and ADRB0 to 2 is shown
in the table. (Setting “L”...Data “0”. Setting “H”...Data “1”).
When ADRA0 to 2 = “111”, the device address A line is specified collectively, and when ADRB0 to 2 = “111”, the device address B line is specified
collectively.
Because up to 7 addresses can be specified for each of device address A and device address B, their combination allows the specification of up
to 49 addresses.
4
LED Control IC W2RF004RM