MCP9804T-E/MS Microchip Technology, MCP9804T-E/MS Datasheet - Page 21

• Manufacturer Part Number: MCP9804T-E/MS
• Description: High-Accuracy, 12-bit Thermal Sensor With Serial Interface 8 MSOP 3x3mm T/R
• Manufacturer: Microchip Technology

Specifications of MCP9804T-E/MS

• Function: Temp Monitoring System (Sensor)
• Topology: ADC (Sigma Delta), Register Bank
• Sensor Type: Internal
• Sensing Temperature: -40°C ~ 125°C
• Output Type: I²C™/SMBus™
• Output Alarm: No
• Output Fan: No
• Voltage - Supply: 2.7 V ~ 5.5 V
• Operating Temperature: -40°C ~ 125°C
• Mounting Type: Surface Mount
• Package / Case: 8-MSOP, Micro8™, 8-uMAX, 8-uSOP,
• Temperature Threshold: + 150 C
• Full Temp Accuracy: +/- 0.25 %
• Digital Output - Bus Interface: 2-Wire, I2C
• Supply Voltage (max): 5.5 V
• Supply Voltage (min): 2.7 V
• Maximum Operating Temperature: + 125 C
• Minimum Operating Temperature: - 40 C
• Supply Current: 200 uA
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

FIGURE 5-3:
© 2009 Microchip Technology Inc.
SDA
SCL
SDA
SCL
• Reading the CONFIG Register.
S
S
1
0
1
0
Note: this is an example routine: (See Appendix A: “Source Code”)
i2c_start();
i2c_write(AddressByte & 0xFE);
i2c_write(0x01);
i2c_start();
i2c_write(AddressByte | 0x01);
UpperByte = i2c_read(ACK);
LowerByte = i2c_read(NAK);
i2c_stop();
2
0
2
0
Address Byte
Timing Diagram for Reading from the Configuration Register (See Section 4.0).
3
1
Address Byte
1
3
4
1
4
1
5
A
2
5
A
2
A
6
1
A
6
1
7
A
0
A
MCP9804
7
0
MCP9804
W
8
8
R
A
C
K
A
C
K
1
0
Configuration Pointer
1
0
2
0
0
2
3
0
3
0
MSB Data
4
0
// send START command
//WRITE Command (see Section 4.1.4)
//also, make sure bit 0 is cleared ‘0’
// Write CONFIG Register
// send Repeat START command
//READ Command
//also, make sure bit 0 is set ‘1’
// READ 8 bits
//and Send ACK bit
// READ 8 bits
//and Send NAK bit
// send STOP command
4
0
5
0
5
0
6
0
6
0
7
0
7
0
MCP9804
8
1
8
0
Master
A
C
K
A
C
K
1
0
2
0
Note:
3
0
LSB Data
4
0
5
1
It is not necessary to
select
pointer if it was set from
the previous read/write.
MCP9804
6
0
7
0
DS22203B-page 21
the
8
0
Master
N
A
K
P
register