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NJU6052

Ver.2004-02-26

(5) SERIAL INTERFACE

(5-1) SERIAL DATA WRITE

The serial data is latched into the shift register on the rising edge of the serial clock (SCK), and determined

on the rising edge of the data request (REQ). The serial data format should be the MSB first.

For COMMAND data transmission, the command data 1 (CMD1) and the command data 2 (CMD2) should

be continuous. The CMD1 is first, then the CMD2. If only 1-byte data is transferred, this data is recognized as the

CMD1. Do not transmit 3 bytes or more, because 3

ignored. If it's absolute necessary to send the 3 bytes or more in the user's application, the only data

(0,0,0,0,0,0,0,0) as the 3

For DUTY data transmission, 8 bytes for PWM REGISTER 0-7 should be continuous. The order is : PWM

REGISTER 0, 1, 2, 3, 4, 5, 6 and 7. If 7bytes or less are transferred, all bytes are accepted. And if 9 bytes or more,

the 9

Note that the data should be in 8*n bits (n=integer number), otherwise it may cause malfunctions. And the

SCK should be “0” when the REQ is changed.

SERIAL DATA FORMAT

TABLE 3-1

Command Data 1

B7

B6

B5

B4

B3

B2

B1

B0

0

SOFF

BRIGHT

STBY

HOLD

REV

TABLE 3-2

Command Data 2

B7

B6

B5

B4

B3

B2

B1

B0

0

0

0

0

0

0

DIVIDE

TABLE 3-3

Duty Data

B7

B6

B5

B4

B3

B2

B1

B0

1

*

PWM REGISTER

FIGURE 1

COMMAND DATA TRANSMISSION

FIGURE 2

DUTY DATA TRANSMISSION

B7

6

5

4

3

2

1

0

B7

6

5

4

3

2

1

0

REQ

SCK

DATA

CMD1

CMD2

B7

6

5

4

3

2

1

0

B7

6

0

B7

6

0

B7

6

REQ

SCK

DATA

PWM REGISTER

0

1

6

7