AD5170BRM2.5-RL7(RevA) Просмотр технического описания (PDF) - Analog Devices

Номер в каталоге

Компоненты Описание

производитель

AD5170BRM2.5-RL7
(Rev.:RevA)

256-Position Two-Time Programmable I2C Digital Potentiometer

Analog Devices 

AD5170

EVALUATION SOFTWARE/HARDWARE

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 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

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

or programming skills. It is easy to set up and to use. Figure 41

shows the software interface. The software can be downloaded

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.

Rev. A | Page 16 of 24

Share Link: