MCP9804-ESLASHMS datasheet(14/54 Pages) MICROCHIP

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MCP9804

DS22203A-page 14

4.1.5

DATA VALID

After

the

Start

condition,

each

bit

data

transmission needs to be settled for a time specified by

tSU-DATA before SCL toggles from low-to-high (see the

Sensor Serial Interface Timing Specifications section).

4.1.6

ACKNOWLEDGE (ACK/NAK)

Each receiving device, when addressed, is obliged to

generate an ACK bit after the reception of each byte.

The master device must generate an extra clock pulse

for ACK to be recognized.

The acknowledging device pulls down the SDA line for

tSU-DATA before the low-to-high transition of SCL from

the master. SDA also needs to remain pulled down for

tH-DATA after a high-to-low transition of SCL.

During read, the master must signal an End-of-Data

(EOD) to the slave by not generating an ACK bit (NAK)

once the last bit has been clocked out of the slave. In

this case, the slave will leave the data line released to

enable the master to generate the Stop condition.

4.1.7

TIME OUT

If the SCL stays low or high for the time specified by

tOUT, the MCP9804 temperature sensor resets the

serial interface. This dictates the minimum clock speed

as specified in the specification.

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