Jupiter Instruments
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1. INTRODUCTION
The JI-300 is a versatile, easy to use, PC hosted adapter used to drive I2C communications
to/from a target bus. The desktop unit can be configured to interface a variety of I2C networks.
Bus parameters such as clock frequency, duty-cycle, setup and hold times, bus voltage, and pull-
up resistor values can be varied. JI-300’s diagnostic features including “excessive clock-stretch”,
“bus-not-free”, and “bus contention” monitoring, as well as status reporting at the conclusion of
each message transaction simplifies I2C trouble-shooting. A Windows software application
manages the setup and control of the instrument. Communications and unit power is provided via
a USB 2.0 connection.
Features
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Programmable SCL clock frequency from 255Hz to 3.8Mhz (20nS steps).
•
Variable bus voltage from 1.50V to 5.25V (10mV steps).
•
Supports Master and multi-Master operation.
•
Software selectable bus pull-up resistors (16 values including open)
•
Low I2C bus capacitance (<40pF typ.)
•
USB 2.0 host interface
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Switched target bus voltage available at connector
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Easy to use Graphical User Interface (GUI) software.
•
Create custom software applications by way of either direct or
Virtual COM Port (VCP) drivers. Programming requires
no
in-depth
knowledge of USB!
•
Includes everything needed to get started – I2C Adapter unit, I2C cable, USB cable,
and a CD-ROM containing application software and user’s manual.
Applications
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Firmware debugging and hardware troubleshooting
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Production line testing
•
Equipment repair and diagnostics
JI-300
4
9/9/07
