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參數(shù)資料
| 型號： | AD5170EVAL |
| 廠商： | Analog Devices, Inc. |
| 元件分類： | 數(shù)字電位計 |
| 英文描述： | 256-Position Two-Time Programmable I2C Digital Potentiometer |
| 中文描述： | 256位二時間的I2C可編程數(shù)字電位器 |
| 文件頁數(shù)： | 16/24頁 |
| 文件大?。?/td> | 900K |
| 代理商： | AD5170EVAL |
AD5170
EVALUATION SOFTWARE/HARDWARE
Rev. A | Page 16 of 24
Figure 41. AD5170 Computer Software Interface
There are two ways of controlling the AD5170. Users can either
program the devices with computer software or external I
2
C
controllers.
SOFTWARE PROGRAMMING
Due to the advantages of the one-time programmable feature,
users may consider programming the device in the factory
before shipping the final product to end-users. ADI offers
device programming software that can be implemented in the
factory on PCs running Windows 95 or later. As a result,
external controllers are not required, which significantly
reduces development time. The program is an executable file
that does not require knowledge of any programming languages
from www.analog.com
.
The AD5170 starts at midscale after power-up prior to OTP
programming. To increment or decrement the resistance, the
user may simply move the scrollbars on the left. To write any
specific value, the user should use the bit pattern in the upper
screen and press the Run button. The format of writing data to
the device is shown in Table 7. Once the desired setting is
found, the user presses the Program Permanent button to blow
the internal fuse links.
To read the validation bits and data from the device, the user
simply presses the Read button. The format of the read bits is
shown in Table 8.
To apply the device programming software in the factory, users
must modify a parallel port cable and configure Pin 2, Pin 3,
Pin 15, and Pin 25 for SDA_write, SCL, SDA_read, and DGND,
respectively, for the control signals (Figure 42). Users should
also lay out the PCB of the AD5170 with SCL and SDA pads, as
shown in Figure 43, such that pogo pins can be inserted for
factory programming.
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