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BD7844AEFV
Datasheet
● Function explaining - continued
2. Register address
After completing the acknowledgement of the slave address, the master device transmits the register address to
BD7844AEFV. Figure 6 shows the register address.
Auto increment option
AI 2
AI 1
AI 0
RA 4
RA 3
RA 2
RA 1
RA 0
Register address
Figure 6. Register address
The auto increment option is specified for MSB 3bit.The address of the register that wants to be controlled is specified
for LSB 5bit. Sending register data continuously with the auto increment option in the three high rank bits can
continuously set each brightness control register. (Mode1 register cannot be set by the auto increment option.)
The register of BD7844AEFV is shown in Table 2 and the auto increment option is shown in Table 3
Register
address(Hex)
00
01
02
03
04
05
06
07
08
09
0A
0B
0C
0D
0E
0F
1A*
Register name
PWM0 [7:0]
PWM1 [7:0]
PWM2 [7:0]
PWM3 [7:0]
PWM4 [7:0]
PWM5 [7:0]
PWM6 [7:0]
PWM7 [7:0]
PWM8 [7:0]
PWM9 [7:0]
PWM10 [7:0]
PWM11 [7:0]
PWM12 [7:0]
PWM13 [7:0]
PWM14 [7:0]
PWM15 [7:0]
MODE1 [7:0]
Initial Value
after reset
00h
00h
00h
00h
00h
00h
00h
00h
00h
00h
00h
00h
00h
00h
00h
00h
03h
Access
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
Function
Brightness control (256steps) OUT0
Brightness control (256steps) OUT1
Brightness control (256steps) OUT2
Brightness control (256steps) OUT3
Brightness control (256steps) OUT4
Brightness control (256steps) OUT5
Brightness control (256steps) OUT6
Brightness control (256steps) OUT7
Brightness control (256steps) OUT8
Brightness control (256steps) OUT9
Brightness control (256steps) OUT10
Brightness control (256steps) OUT11
Brightness control (256steps) OUT12
Brightness control (256steps) OUT13
Brightness control (256steps) OUT14
Brightness control (256steps) OUT15
Mode 1 setting
*MODE1 register cannot be set by the auto increment option.
Table2. Register
AI2
0
0
0
0
1
1
1
1
AI1
0
0
1
1
0
0
1
1
AI0
0
1
0
1
0
1
0
1
Function
Auto increment none
Address auto increment (+1) for brightness control register PWM0 to
15only.
Prohibited
Table3. Auto increment option
www.rohm.com
? 2012 ROHM Co., Ltd. All rights reserved.
TSZ22111 ? 15 ? 001
9/14
TSZ02201-0G3G0CZ00310-1-2
15.Oct.2012 Rev.001
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