MCP9600 datasheet(19/50 Pages) MICROCHIP

19 / 50 page

 2015-2016 Microchip Technology Inc.

DS20005426B-page 19

MCP9600

FIGURE 4-5:

Timing Diagram to Set a Register Pointer and Read a Two Byte Data.

SDA

Alert 1, 2, 3, 4 MSB

567

345

SCL

Address Byte

345

X XX X

345

678

TABLE 4-4:

POINTERS

Alert Limit

Registers

Pointer

Alert 1

0001 0000

Alert 2

0001 0001

Alert 3

0001 0010

Alert 4

0001 0011

MCP9600

Alert 1, 2, 3, 4 LSB

MSB Data

567

345

Address Byte

LSB Data

MCP9600

Master

SDA

SCL

MCP9600 Clock Stretching

Note: this is an example pseudo routine:

i2c_start();

// send START command

i2c_write(b’1100 0000’);

//WRITE Command

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

i2c_write(b’0001 00XX’);

// Write Alert registers

i2c_write(b’XXXX XXXX’);

// Write register Upper Byte

i2c_write(b’XXXX XXXX’);

// Write register Lower Byte

i2c_stop();

// send STOP command

i2c_start();

// send START command

i2c_write(b’1100 0001’);

//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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