© 2009 Microchip Technology Inc.

DS22203A-page 43

MCP9804

Software License Agreement

The software supplied herewith by Microchip Technology Incorporated (the “Company”) is intended and supplied to you, the

Company’s customer, for use solely and exclusively with products manufactured by the Company.

The software is owned by the Company and/or its supplier, and is protected under applicable copyright laws. All rights are reserved.

Any use in violation of the foregoing restrictions may subject the user to criminal sanctions under applicable laws, as well as to civil

liability for the breach of the terms and conditions of this license.

THIS SOFTWARE IS PROVIDED IN AN “AS IS” CONDITION. NO WARRANTIES, WHETHER EXPRESS, IMPLIED OR STATU-

TORY, INCLUDING, BUT NOT LIMITED TO, IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICU-

LAR PURPOSE APPLY TO THIS SOFTWARE. THE COMPANY SHALL NOT, IN ANY CIRCUMSTANCES, BE LIABLE FOR

SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES, FOR ANY REASON WHATSOEVER.

APPENDIX A: SOURCE CODE

/********************************************************************

FileName:

I2C.h

Dependencies: I2C.c

Processor:PIC18 Microcontrollers

Complier:

Microchip C18 (for PIC18) or C30 (for PIC24)

Company:Microchip Technology, Inc.

Software License Agreement:

The software supplied herewith by Microchip Technology Incorporated

(the “Company”) for its PIC® Microcontroller is intended and

supplied to you, the Company’s customer, for use solely and

exclusively on Microchip PIC Microcontroller products. The

software is owned by the Company and/or its supplier, and is

protected under applicable copyright laws. All rights are reserved.

Any use in violation of the foregoing restrictions may subject the

user to criminal sanctions under applicable laws, as well as to

civil liability for the breach of the terms and conditions of this

license.

THIS SOFTWARE IS PROVIDED IN AN “AS IS” CONDITION. NO WARRANTIES,

WHETHER EXPRESS, IMPLIED OR STATUTORY, INCLUDING, BUT NOT LIMITED

TO, IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A

PARTICULAR PURPOSE APPLY TO THIS SOFTWARE. THE COMPANY SHALL NOT,

IN ANY CIRCUMSTANCES, BE LIABLE FOR SPECIAL, INCIDENTAL OR

CONSEQUENTIAL DAMAGES, FOR ANY REASON WHATSOEVER.

**************************************************************/

#define ACK

1

#define NACK 0

#define

SLAVE_7

6

/* I2C Slave mode, 7-bit address

*/

#define

SLAVE_10

7

/* I2C Slave mode, 10-bit address

*/

#define

MASTER

8

/* I2C Master mode

*/

/* SSPSTAT REGISTER */

#define

SLEW_OFF

0xC0

/* Slew rate disabled for 100kHz mode */

#define

SLEW_ON

0x00

/* Slew rate enabled for 400kHz mode

*/

extern void OpenI2C(unsigned char sync_mode, unsigned char slew);

extern void I2CStart(void);

extern void I2CReStart(void);

extern void I2CStop(void);

extern unsigned char WriteI2C(unsigned char data_out);

extern unsigned char ReadI2C(unsigned char ACK);

extern void ACKI2C(void);

extern void nACK(void);

extern void WaitForACK(void);

extern unsigned char I2CDataReady(void);