TCN75-5.0MPA データシートの表示（PDF） - TelCom Semiconductor, Inc

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TCN75-5.0MPA

2-WIRE SERIAL TEMPERATURE SENSOR AND THERMAL MONITOR

TelCom Semiconductor, Inc 

2-WIRE SERIAL TEMPERATURE

SENSOR AND THERMAL MONITOR

PRELIMINARY INFORMATION

Address Byte

Immediately following the Start Condition, the host must

next transmit the address byte to the TCN75. The four most

significant bits of the Address Byte (A6, A5, A4, A3) are fixed

to 1001(B). The states of A2, A1 and A0 in the serial bit

stream must match the states of the A2, A1 and A0 address

inputs for the TCN75 to respond with an Acknowledge

(indicating the TCN75 is on the bus and ready to accept

data). The eighth bit in the Address Byte is a Read-Write Bit.

This bit is a 1 for a read operation or 0 for a write operation.

Acknowledge (ACK)

Acknowledge (ACK) provides a positive handshake

between the host and the TCN75. The host releases SDA

after transmitting eight bits then generates a ninth clock

cycle to allow the TCN75 to pull the SDA line LOW to

acknowledge that it successfully received the previous eight

bits of data or address.

Data Byte

After a successful ACK of the address byte, the host

must next transmit the data byte to be written or clock out the

data to be read. (See the appropriate timing diagrams.) ACK

will be generated after a successful write of a data byte into

the TCN75.

Stop Condition (STOP)

Communications must be terminated by a stop condi-

tion (a LOW to HIGH transition of SDA while SCL is HIGH).

The Stop Condition must be communicated by the transmit-

ter to the TCN75.

Power Supply

To minimize temperature measurement error, the

TCN75VO_-3 is factory calibrated at a supply voltage of

3.3V ±5V and the TCN75CO_-5 is factory calibrated at a

supply voltage of 5V ±5%. Either device is fully operational

TCN75

over the power supply voltage range of 2.7V to 5.5V, but

with a lower measurement accuracy. Figure 2 shows the

worst case temperature measurement error for the

TCN75CO_-3 operated at a power supply voltage of 5V ±

10%. Figure 3 shows the worst case temperature measure-

ment error for the TCN75CO_-3 operated at a power supply

voltage of 3.3V ±10%.

±5

±4

±3

±2

±1

20

35 50 65 80 95

TCN75 Case Temeprature (°C)

110 125

Figure 2. TCN75CO_-3 Measurement Error at VDD = 5V ± 10%

±5

±4

±3

±2

Address

A0

(Set as Desired) A1

A2

I2C Interface SDA

SCL

+VDD (3V to 5.5V)

CBypass

0.1µF Recommended

Unless Device is Mounted

Close to CPU

8

7

6

5

TCN75

3

TO PROCESSOR

INT/CMPTR

1

2

4

±1

20

35 50 65 80 95

TCN75 Case Temeprature (°C)

110 125

Figure 3. TCN75CO_-5 Measurement Error at VDD = 3.3V ± 10%

Figure 1. Typical Application

TCN75-04 6/16/97

5

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