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参数资料
| 型号： | BD7844AEFV-E2 |
| 厂商： | Rohm Semiconductor |
| 文件页数： | 7/17页 |
| 文件大小： | 0K |
| 描述： | IC LED DISPLAY DVR 5V 28-HTSSOP |
| 标准包装： | 1 |
| 拓扑： | 开路漏极，PWM |
| 输出数： | 16 |
| 内部驱动器： | 是 |
| 类型 - 主要： | 通用 |
| 频率： | 2MHz |
| 电源电压： | 4.5 V ~ 5.5 V |
| 输出电压： | 20V |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 28-VSSOP（0.173"，4.40mm 宽） |
| 供应商设备封装： | 28-HTSSOP-B |
| 包装： | 标准包装 |
| 工作温度： | -40°C ~ 85°C |
| 其它名称： | BD7844AEFV-E2DKR |
BD7844AEFV
Datasheet
STOP condition. Figure 2 shows basic format (I C) of the control command of BD7844AEFV.
● Function explaining
1. Slave address
LED driver BD7844AEFV is a slave device. The master device outputs the transmission clock and the transmission
data, and BD7844AEFV who is the slave returns the acknowledgement. The master device transmits the slave address
of BD7844AEFV following the START condition. Afterwards, BD7844AEFV can be controlled in the command by
transmitting the register address and the register data continuously, and doing the transmission completion under the
2
Master
transmits
data
Master
receives
S
S
Slave
address
Slave
address
“0” = Write
R/W A
“0” = Write
R/W A
Register
address
Register
address
A
A
S
Register
data
Slave
address
A
P
data
S=START, P=STOP
“1” = Read
From master to slave
From slave to master
R/W
A
Register
data
A
P
Figure 2. Basic format of control command （ I 2 C ）
BD7844AEFV has three kinds of slave addresses (for usually, for all calls, and for software reset).
1-1. Usual slave address
Figure 3 shows the slave address of BD7844AEFV. Because an internal pull-up resistor has not placed to the address
terminal (A[3:0]) that can be selected with hardware to save power consumption, it is necessary to connect them with
high ( =VDD ) or low ( =GND ).
Slave address
1
0
1
A3
A2
A1
A0
R/W
Fixed
It is optional with the address terminal
Figure 3. Usual slave address
The last RW bit of the slave address byte defines the executed operation. Reading is selected when setting it to logic 1,
and writing is selected when setting it to logic 0.
Fixed
101
101
101
101
101
101
101
101
101
101
101
101
101
101
101
A3
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
A2
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
A1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
A0
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
0
R/W
R/W
R/W
Function
Usual 1
Usual 2
Usual 3
Usual 4
Usual 5
Usual 6
Usual 7
Usual 8
All call
Usual 9
Usual 10
Software reset
Usual 11
Usual 12
Usual 13
101
1
1
1 1
R/W
Usual 14
Table1. Slave address
www.rohm.com
? 2012 ROHM Co., Ltd. All rights reserved.
TSZ22111 ? 15 ? 001
7/14
TSZ02201-0G3G0CZ00310-1-2
15.Oct.2012 Rev.001
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