MCP98242-BESLASHST datasheet(9/46 Pages) MICROCHIP

9 / 46 page

DS21996A-page 9

MCP98242

FIGURE 4-1:

Device Addressing.

4.1.5

DATA VALID

After the Start condition, each bit of data in

transmission needs to be settled for a time specified by

tSU-DATA before SCLK toggles from low-to-high (see

“Sensor And EEPROM Serial Interface Timing

Specifications” on Page 4).

4.1.6

ACKNOWLEDGE (ACK)

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 SCLK from

the master. SDA also needs to remain pulled down for

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

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 (MCP98242)

If the SCLK stays low or high for time specified by tOUT,

the MCP98242 temperature sensor resets the serial

interface. This dictates the minimum clock speed as

specified in the SMBus specification. However, the

EEPROM does not reset the serial interface.

Therefore, the master can hold the clock indefinitely to

process data from the EEPROM.

1 234

678

SCLK

SDA

1 1 A2 A1 A0

Start

Address Byte

Slave

Address

R/W

MCP98242 Response

Code

Address

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