Rainbow-electronics DS1631 Manual de usuario descargar pdf (Pagina 11)

DS1631

11 of 14

NOTES:

1) If only one byte of temperature data is needed, the master can issue a NACK followed by a STOP

after reading the first data byte, and the DS1631 will quit transmitting data.

2) After issuing a write command, no further writes should be requested for at least 10ms due to the

EEPROM write cycle time.

3) Data direction depends upon R/ W bit in the 2-wire control byte.

DS1631 OPERATION EXAMPLE

In this example, the master configures the DS1631 (A

1

A

2

A

3

= 000) for continuous conversions and

thermostatic function.

MASTER

MODE

DS1631

MODE

DATA

(MSb first) COMMENTS

TX RX START Master issues a START condition.

TX RX 90h Master sends control byte with R/W¯¯ = 0.

RX TX ACK DS1631 generates acknowledge bit.

TX RX ACh Master sends Access Config command.

RX TX ACK DS1631 generates acknowledge bit.

TX RX 02h Master writes a data byte to the configuration register to

put the DS1631 in continuous conversion mode and set the

T

OUT

polarity to active high.

RX TX ACK DS1631 generates acknowledge bit.

TX RX START Master generates a repeated START condition.

TX RX 90h Master sends control byte with R/W¯¯ = 0.

RX TX ACK DS1631 generates acknowledge bit.

TX RX A1h Master sends Access TH command.

RX TX ACK DS1631 generates acknowledge bit.

TX RX 28h Master sends most significant data byte for T

H

= +40°C.

RX TX ACK DS1631 generates acknowledge bit.

TX RX 00h Master sends least significant data byte for T

H

= +40°C.

RX TX ACK DS1631 generates acknowledge bit.

TX RX START Master generates a repeated START condition.

TX RX 90h Master sends control byte with R/W¯¯ = 0.

RX TX ACK DS1631 generates acknowledge bit.

TX RX A2h Master sends Access TL command.

RX TX ACK DS1631 generates acknowledge bit.

TX RX 0Ah Master sends most significant data byte for T

L

= +10°C.

RX TX ACK DS1631 generates acknowledge bit.

TX RX 00h Master sends least significant data byte for T

L

= +10°C.

RX TX ACK DS1631 generates acknowledge bit.

TX RX START Master generates a repeated START condition.

TX RX 90h Master sends control byte with R/W¯¯ = 0.

RX TX ACK DS1631 generates acknowledge bit.

TX RX 51h Master sends Start Convert T command.

RX TX ACK DS1631 generates acknowledge bit.

TX RX STOP Master issues a STOP condition.

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