TCN75 datasheet(9/20 Pages) MICROCHIP

9 / 20 page

DS21490C-page 9

TCN75

4.3.1

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.

4.3.2

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.

4.3.3

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.

4.3.4

STOP CONDITION (STOP)

Communications must be terminated by a Stop

condition (a LOW-to-HIGH transition of SDA while SCL

is HIGH). The Stop condition must be communicated

by the transmitter to the TCN75.

4.3.5

POWER SUPPLY

To minimize temperature measurement error, the

TCN75-3.3 MOA and TCN75-3.3 MUA are factory cal-

ibrated at a supply voltage of 3.3V ±5% and the

TCN75-5.0 MOA and TCN75-5.0 MUA are factory cal-

ibrated at a supply voltage of 5V ±5%. Either device is

fully operational over the power supply voltage range of

2.7V to 5.5V, but with a lower measurement accuracy.

The typical value of this power supply-related error is

±2°C.

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