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PMODIA_RM

更新时间： 2024-11-25 12:13:03

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Digilent PmodIAâ¢ Impedance Analyzer Reference Manual

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PMODIA_RM 数据手册

Digilent PmodIA™ Impedance

Analyzer Reference Manual

1300 Henley Court | Pullman, WA 99163

(509) 334 6306 Voice and Fax

Revision: November 01, 2012

Note: This document applies to REV A of the board

Overview

The PmodIA is an impedance analyzer built

around the Analog Devices AD5933

Impedance Converter Network Analyzer.

Features include:

•

I²C communication interface

capable of measuring impedances

ranging from 100Ω to 10 MΩ.

programmable frequency sweep: start

frequency, step increment, and number

of steps.

•

clock (SCL) respectively on the PmodIA. (See

Table 1.) The following instructions explain

how to read and write to the device.

•

programmable gain amplifier

external clock generation optional

You must consider two protocols when writing

to the PmodIA: the write byte/command byte

and the block write. Writing a single byte from

the master to the slave requires the master to

initiate a start condition and send the 7-bit

slave address. You must hold the read/write bit

low to write to the slave device successfully.

The PmodIA should set the slave address as

0001101 (0x0D) upon startup. After the slave

acknowledges it’s address, the master must

send the address of the register it wants to

write to. Once the slave acknowledges receipt

of this address, the master will send a single

data byte that the slave should acknowledge

with a return bit. The master should then issue

a stop condition.

Functional Description

The PmodIA uses an 8-pin connector that

allows for I²C communication. There is also a

1-pin connector that allows you to select either

a high or low impedance measurement.

The PmodIA measures impedance by emitting

an AC voltage at a known frequency and

sampling the frequency response to identify

the unknown impedance value. You can

access the voltage output via the SMA

connector J3. SMA connector J4 captures the

response.

Please see the AD5933 data sheet, available

from www.analog.com, for more detailed

information on controlling the analyzer.

You can also use this protocol to set a pointer

for a register address. After the master sends

the slave address and write bit, and the slave

responds with an acknowledge bit, the master

sends a pointer command byte (10110000, or,

0xB0). The slave will assert an acknowledge

bit and then the master will send the address

of the register to point to in memory. The next

time the device reads from or writes data to a

I²C Interface

The PmodIA acts as a slave device using I²C

communication protocol. The I²C interface

standard uses two signal lines. These are I²C

data and I²C clock. These signals map to the

serial data (SDA) and serial

Doc: 502-246

page 1 of 3

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