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Users Manual
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USBee DX I2C Controller
This section details the operation of the I2C Controller
application that comes with the USBee DX.
The I2C Controller lets you control (be the I2C Master) an I2C device
using the SDA and SCL lines of the USBee DX.
The Below you see the application screen.
To control an I2C device you must first create an I2C text
script in the script window. You can
either type in the window as you would a text editor or you can use the buttons
on the left to quickly insert the correct tokens for the various parts of an
I2C transaction.
The valid tokens are as follows:
| Token to use in Script |
Meaning of Token |
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<START>
|
To
generate a Start condition
|
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<STOP>
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To
generate a Stop conditon
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<Slave Address Read: A0> <ACK=?>
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To generate a Read Command
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<Slave Address Write: A0> <ACK=?>
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To generate a Write Command
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<Data to Slave: 00> <ACK=?>
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To send a byte to the slave
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<Data from Slave: ??> <ACK>
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To read a byte from the slave
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<Data
from Slave: ??> <No ACK>
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To
read a byte from the slave with no ACK following the byte
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I2C Controller Specifications
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I2C Clock Speed
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2.2 KHz average
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I2C Control Method
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Text Script
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I2C Script Tokens
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Start, Stop, Ack, Nak, Read, Write, Data
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Script Edit Functions
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Cut, Copy, Paste, Save, Open, New
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I2C Output Format
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Text File (includes read data and Ack state)
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Channel Output
Drive Current
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4mA
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Output Low Level
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< 0.8V
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Output High Level
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Open Collector (requires external pull-up resistor)
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