MCP960X datasheet(22/57 Pages) MICROCHIP

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DS20005426G-page 22

MCP960X/L0X/RL0X

FIGURE 4-3:

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

SDA

678

456

SCL

Address Byte

Device*

MSB Data

678

456

345

Address Byte

LSB Data

Host

SDA

SCL

TABLE 4-2:

POINTERS

Read-Only

Registers

Pointer

0000 0000

TΔ

0000 0001

0000 0010

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’0000 00XX’);

// Write TH, TΔ, or TC registers

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 (with t

STRETCH delay)

// and Send ACK bit

LowerByte = i2c_read(NAK);

// READ 8 bits (with t

STRETCH delay)

// and Send NAK bit

i2c_stop();

// send STOP command

//Convert the temperature data

if ((UpperByte & 0x80) == 0x80){

//Temperature

 0°C

Temperature = (UpperByte x 16 + LowerByte / 16) - 4096;

}else

//Temperature

 0°C

Temperature = (UpperByte x 16 + LowerByte / 16);

//TH, TD, or TC Temperature (°C) depending on the register pointer value shown in Table 4-2.

MCP960X/L0X/RL0X Clock Stretching,

tSTRETCH

Device*

Host

Pointer

(Table 4-2)

Device*

*MCP960X/L0X/RL0X

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