AD5173BRM10(RevA) 데이터 시트보기 (PDF) - Analog Devices

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AD5173BRM10
(Rev.:RevA)

256-Position One-Time Programmable Dual-Channel I2C Digital Potentiometers

Analog Devices 

AD5172/AD5173

EVALUATION SOFTWARE/HARDWARE

Figure 46. AD5172/AD5173 Computer Software Interface

There are two ways of controlling the AD5172/AD5173. Users

can either program the devices with computer software or with

external I2C 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 a

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 any programming languages or user

programming skills. It is easy to set up and to use. Figure 46

shows the software interface. The software can be downloaded

from www.analog.com.

The AD5172/AD5173 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 may press the Program Permament button to

blow the internal fuse links.

To read the validation bits and data out 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 Pins 2, 3, 15,

and 25 for SDA_write, SCL, SDA_read, and DGND, respectively,

for the control signals (Figure 47). Users should also lay out the

PCB of the AD5172/AD5173 with SCL and SDA pads, as shown

in Figure 48, such that pogo pins can be inserted for factory

programming.

Rev. A | Page 16 of 24

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