参数资料
| 型号： | ISL6421ER |
| 厂商： | Intersil |
| 文件页数： | 3/18页 |
| 文件大小： | 0K |
| 描述： | IC REG SGL LNB CONTROL 32-QFN |
| 标准包装： | 60 |
| 应用： | 转换器，卫星信号接收机顶盒设计 |
| 输入电压： | 8 V ~ 14 V |
| 输出数： | 1 |
| 输出电压： | 13 V ~ 18 V |
| 工作温度： | -20°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 32-VFQFN 裸露焊盘 |
| 供应商设备封装： | 32-QFN（5x5） |
| 包装： | 管件 |
Application Note 1083
I 2 C Bus Communication Setup
To control and exercise the ISL6421/ISL6425 requires
communication through the I 2 C bus clock (SCL) and data
(SDA) pins. Refer to the ISL6421, ISL6425 datasheets for
more information about the I 2 C bus specification. You can
use existing I 2 C hardware/software, a word generator, or
use the PC to I 2 C hardware/software included in the
ISL6421/ISL6425 evaluation kit to produce the necessary
I 2 C waveforms.
USB-I2CIO Board Driver Installation - To use a PC to
control the I 2 C bus to communicate with the
ISL6421/ISL6425 you will have to install the drivers of the
USB-I2CIO board included in the kit. You will need a
Windows 98/XP/2000 machine with a standard USB port.
1. The evaluation kit comes with a CD containing the
software and drivers to control the I 2 C bus. Copy the
contents of the CD to some directory, e.g., C:\’some
directory’.
2. Applying power to the USB-I2CIO board: The USB-I2CIO
board has the option of being powered with 3.3V through
the USB bus of the PC or externally with 5V connected to
the +5 test point and GND test point. The I 2 C bus can
operate at 3.3V or 5V logic levels. If you use an external
5V supply then place a shunt jumper shorting pins 2 and
3 of JP3. If you are using an external 5V supply to power
the USB-I2CIO board, place a shunt jumper shorting pins
1 and 2 of JP3.
3. After the USB-I2CIO board is powered up, connect the
USB cable to the USB port of a PC.
4. Windows should detect the new USB device and the
‘Found New Hardware Wizard’ should begin. This will
help you install the drivers. Follow the directions on the
screen until it asks you where to search for the drivers. At
this point, you should select the ‘choose location’ option
and browse to the C:\’some directory’ created in step one
and select the drivers folder.
5. Follow the remaining directions and the driver should be
installed and the USB-I2CIO detected by your PC.
6. If this is successful, another ‘Found New Hardware
Wizard’ window will appear. Repeat steps 4 and 5. At this
point, the USB-I2CIO board should be ready to use.
7. To connect the USB-I2CIO board to the ISL6421/ISL6425
evaluation board, use the 5-pin to 4-pin connector cable.
Connect the 5-pin connector to J4 on the USB-I2CIO
board and the 4-pin connector to J1 on the
ISL6421/ISL6425 evaluation board.
8. Turn on the power supplies to power up the
ISL6421/ISL6425 evaluation board.
9. Run the ISL6421&25_I2C_reva.exe program copied to
C:\’some directory’. Figure 3 shows the PC to I 2 C
software application window. Click the ‘Open Device’
button.
3
10. If you receive a ‘No USB Device Detected’ error:
? Make sure the drivers were installed correctly. If
Windows did not detect your USB device, try running
the Add/Remove Hardware Wizard in the control panel.
? Make sure the USB board is powered up (internally or
externally, not both).
11. If you receive the ‘Incorrect Return Value’ error:
? The ISL6421/ISL6425 evaluation board may not be
powered up. Check the power connections.
? Make sure SCL and SDA are connected correctly. The
5-pin connector to the USB-I2CIO board only fits one
way. Try reversing the 4-pin connector at J1 of the
ISL6421/ISL6425 evaluation board.
FIGURE 3. PC TO I 2 C APPLICATION WINDOW
Using the PC to I 2 C Application
After opening the application window and clicking on the
‘Open Device’ button, the program will detect the USB-I2CIO
board and initialize the I 2 C system registers of the
ISL6421/ISL6425. To evaluate the ISL6421/ISL6425
functionality, toggle the system register bits as needed and
then click on the ‘Write I2C’ button to write to the system
registers. The lower portion of the application window shows
the current values of the system register bits. They are read
and updated continuously. The OLF1 and OTF flag in
system register 1 and 2 are read only bits and provide
diagnostic status of the ISL6421/ISL6425.
AN1083.1
May 6, 2005
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