?2011 Microchip Technology Inc.
DS25095A-page 21
MCP9808
FIGURE 5-3:
Timing Diagram for Reading from the Configuration Register (see Section 4.0 Serial
Communication ).
SDA
A
C
K
0 0 1 1
A
Configuration Pointer
0 0 0 0
A
C
K
S
2
A
1
A
0
1 2 3 4 5 6 7 8
1 2 3 4 5 6 7 8
SCL
0
Address Byte
A
C
K
0 0 1 1
A
MSB Data
A
C
K
N
A
K
S
P
2
A
1
A
0
1 2 3 4 5 6 7 8
1 2 3 4 5 6 7 8
1 2 3 4 5 6 7 8
Address Byte
LSB Data
R
MCP9808
MCP9808
MCP9808
Master
Master
W
SDA
SCL
0 0 1
0 0 0 0 0
0 0 0
0 0 0 0 1 0 0 0
Reading the CONFIG Register:
Note:
It is not necessary to
select the Register
Pointer if it was set
from the previous
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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