MCP9808 datasheet(21/52 Pages) MICROCHIP

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DS25095A-page 21

MCP9808

FIGURE 5-3:

Timing Diagram for Reading from the Configuration Register (see Section 4.0 “Serial

Communication”).

SDA

Configuration Pointer

567

345

SCL

Address Byte

011

MSB Data

123

345

567

Address Byte

LSB Data

MCP9808

Master

SDA

SCL

Reading the CONFIG Register:

Note:

It is not necessary to

select the Register

Pointer if it was set

from

the

read/write.

Note: This is an example routine (see Appendix A: “Source Code”).

i2c_start();

// send START command

i2c_write(AddressByte & 0xFE);

//WRITE Command

(see

Section 4.1.4 “Address Byte”)

//also, make sure bit 0 is cleared ‘0’

i2c_write(0x01);

// Write CONFIG Register

i2c_start();

// send Repeat START command

i2c_write(AddressByte | 0x01);

//READ Command

//also, make sure bit 0 is set ‘1’

UpperByte = i2c_read(ACK);

// READ 8 bits

//and Send ACK bit

LowerByte = i2c_read(NAK);

// READ 8 bits

//and Send NAK bit

i2c_stop();

// send STOP command

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