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User's Guide

SNVA343A–April 2008–Revised April 2013

AN-1840 USB I

C Interface Board Reference Manual

This application note discusses the features, requirements, and usages of the USB I

C Interface board.

Contents

1 Introduction .................................................................................................................. 2

2 USB I

C Interface Board Key Features .................................................................................. 2

3 Block Diagram ............................................................................................................... 2

4 System Requirements ...................................................................................................... 2

4.1 Hardware Requirements .......................................................................................... 2

5 Serial Interface and Programming Connectors ......................................................................... 3

5.1 Serial Interface “J” ................................................................................................. 3

5.2 Electrical Characteristics of I

C .................................................................................. 4

6 I

C Compatible Interface ................................................................................................... 4

6.1 I

C Signals .......................................................................................................... 4

6.2 I

C Data Validity .................................................................................................... 4

6.3 I

C Start and Stop Conditions .................................................................................... 4

6.4 Transferring Data .................................................................................................. 5

List of Figures

1 Block Diagram............................................................................................................... 2

2 USB I

C Interface Module.................................................................................................. 3

3 I

C Signals: Data Validity................................................................................................... 4

4 START and STOP Conditions............................................................................................. 5

5 I

C Chip Address............................................................................................................ 5

6 I

C Write Cycle .............................................................................................................. 5

7 I

C Read Cycle .............................................................................................................. 6

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SNVA343A–April 2008–Revised April 2013

AN-1840 USB I

C Interface Board Reference Manual

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Summary of content (7 pages)

PAGE 1
User's Guide SNVA343A – April 2008 – Revised April 2013 AN-1840 USB I2C Interface Board Reference Manual This application note discusses the features, requirements, and usages of the USB I2C Interface board. 1 2 3 4 5 6 Contents Introduction .................................................................................................................. USB I2C Interface Board Key Features .................................................................................. Block Diagram ................
PAGE 2
Introduction 1 www.ti.com Introduction The USB I2C Interface board interacts with your application hardware via an USB port in a PC. The microcontroller with flash memory enables to control your application hardware and develop specific application functions via software. (Texas Instruments does not provide interaction software, which networks both application board and I2C board).
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Serial Interface and Programming Connectors www.ti.com Figure 2. USB I2C Interface Module 5 Serial Interface and Programming Connectors 5.1 Serial Interface “J” The table below shows the pin configuration for the COP8 controller for all interface modes. (1) (2) Pin Name I2C Board Pin/COP8 Pin Comment SDA (Data out) SDA / 40 R = 2 kΩ (1) SCL (Clock) SCL / 39 R = 2 kΩ (1) Analog Ch. 6/GPIO A5 / 38 (2) Analog Ch. 5/GPIO A4 / 37 (2) Analog Ch. 4/GPIO A3 / 36 (2) Analog Ch.
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I2C Compatible Interface 5.2 www.ti.com 2 Electrical Characteristics of I C The USB I2C board requires 5V from a computer to function correctly. The maximum current that the I2C board will draw from the computer is 500 mA. This I2C board will function within the temperature range of 0°C ≤ TA ≤ 70°C.
PAGE 5
I2C Compatible Interface www.ti.com SDA SCL S P START condition STO P condition Figure 4. START and STOP Conditions 6.4 Transferring Data Every byte put on the SDA line must be eight bits long, with the most significant bit (MSB) being transferred first. Each byte of data has to be followed by an acknowledge bit. All clock pulses are generated by the master. The transmitter releases the SDA line (HIGH) during the acknowledge clock pulse.
PAGE 6
I2C Compatible Interface www.ti.com When a READ function is to be accomplished, a WRITE function must precede the READ function, as shown in the Read Cycle waveform. Figure 7.
PAGE 7
IMPORTANT NOTICE Texas Instruments Incorporated and its subsidiaries (TI) reserve the right to make corrections, enhancements, improvements and other changes to its semiconductor products and services per JESD46, latest issue, and to discontinue any product or service per JESD48, latest issue. Buyers should obtain the latest relevant information before placing orders and should verify that such information is current and complete.