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参数资料
| 型号： | BD7844AEFV-E2 |
| 厂商： | Rohm Semiconductor |
| 文件页数： | 11/17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
All BD7844AEFV on the I C bus can be reset in the power supply on condition by software reset. In the correct
● Function explaining - continued
3-2. Software reset
2
execution, there should not be device that monopolizes the bus. Software reset is defined as follows.
The slave address for software reset that the R/W bit is set to "0" (write) is sent by the I C bus master.
1.
2.
3.
4.
5.
6.
7.
The START condition is sent by the I 2 C bus master.
2
Only when it is recognized that the slave address for software reset is [10110110] (B6h), BD7844AEFV executes
reset. When the R/W bit is set to logic "1" (read), it is not recognized. Even R/W bit is logic "0" and "1", the
acknowledgement is returned. But it is only logic "0" that reset is recognized.
When the slave address for software reset is sent and recognized, the master sends two bytes with two specific
values.
Byte 1= A5h: BD7844AEFV recognizes only this value. When byte 1 is not A5h, BD7844AEFV doesn't recognize
it.
Byte 2= 5Ah: BD7844AEFV recognizes only this value. When byte 2 is not 5Ah, BD7844AEFV doesn't recognize it.
The master sends the STOP condition to terminate the software reset command when correct two bytes are sent
and it is recognized correctly. Afterwards, BD7844AEFV is reset in the power supply on condition.
3-3. Device limitation software reset
Only BD7844AEFV selected in the slave address can be reset in the power supply on condition by making the
LIMITRESET bit of the Mode1 register logic 1.
3-4. External reset
External reset is executed by maintaining RESETB terminal for the period of minimum t W . The register and the I 2 C bus
state machine of BD7844AEFV is maintained in the state of default until becoming RESETB input becomes “H” level.
Take care: Please connect the RESETB terminal with “H”, when you do not use an active connection.
4. I2CSEL function
It can be set that the SDA terminal accepts only the input by connecting the I2CSEL terminal with “L”.
Take care : Because the acknowledge and reading data of the register is not returned to the master
device, control software for I 2 C cannot be used as it is.
● Power dissipation (On the ROHM’s standard board)
1.8
1.6
1.45W
1.4
1.2
1.0
0.8
0.6
0.4
0.2
0.0
0
25
50
75
100
125
150
Ta （℃）
Figure 7. Power dissipation
www.rohm.com
? 2012 ROHM Co., Ltd. All rights reserved.
TSZ22111 ? 15 ? 001
11/14
TSZ02201-0G3G0CZ00310-1-2
15.Oct.2012 Rev.001
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