LED Control IC

W2RG012RN

9

■ Command System

Device Designation

If the device ID and device address match IC settings, received data are retrieved. Device ID is fixed as “010”. The same command can be trans-

mitted to all devices by designating “1111” as device address. The relationship between device address and device address terminal is shown in

the table below.

Register Designation

Word Length

The data unit of gradation data is designated.

Register Address (Designation of lighting position)

The address of gradation register is designated. The upper limit of address that can be designated, and the number of gradation that can be trans-

ferred continuously, vary according to division mode setting and word length designation.

Register address (Special address)

All gradation registers can be designated collectively by designating 0x7F (127).

The power saving register can be designated by designating 0x78 (120)

Gradation Data

Gradation Designation

Gradation data are designated using 8 bits (256 gradations), 7 bits (128 gradations), or 4 bits (16 gradations).

Power-saving Mode

When the power-saving data register is designated by register address-bits, the lowest 4 bits are treated as power-saving data.

Communication mode

Device selection data dvc_dat (7:0)

76543210

Device ID

Device Address

RW

Standard

0

1

0

ADR1(1:0)

ADR0(1:0)

0

SP-D7

---

Communication mode

Register Selection data reg_dat (7:0)

76543210

Standard

Word Length

Register Address

SP-D7

- - -

Word length designation

Word length

0

8bit

1

4bit

Communication mode

Gradation data light_dat(7:0)

76543210

Standard (8-bit)

Gradation Data

Standard (4-bit)

Gradation Data N

Gradation Data N+1

SP-D7

Gradation Data

- - -

Communication

mode

Gradation data light_dat(7:0)

7654

3

2

1

0

Standard

0000

Power-saving data

(current control)

Power-saving data

(duty ratio control)

SP-D7

- - -

0

0

0

Power-saving

Data

Output current or

output duty ratio

00

100%

01

75%

10

50%

11

25%