Rainbow-electronics DS1721 Bedienungsanleitung PDF herunterladen (Seite 11)

DS1721

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Stop Convert T [22h]

This command stops temperature conversion. No further data is required. This command may be used to

halt a DS1721 in continuous conversion mode. After issuing this command, the current temperature

measurement will be completed, stored and the DS1721 will remain idle until a Start Convert T is issued

to resume conversions.

DS1721 COMMAND SET Table 4

INSTRUCTION DESCRIPTION PROTOCOL

2-WIRE BUS DATA

AFTER ISSUING

PROTOCOL

NOTES

Access

Configuration

Writes to/Reads from 8-bit

configuration/status register

ACh 1 data byte 1

Access TH

Writes to/Reads from

12-bit TH register

A1h 1 or 2 data bytes 1, 3

Access TL

Writes to/Reads from

12-bit TL register

A2h 1 or 2 data bytes 1, 3

CONVERSION COMMANDS

Start Convert T

Initiates temperature

conversion

51h idle 2

Stop Convert T

Terminates continuous

conversions

22h idle 2

Read

Temperature

Reads 12-bit

Temperature register

AAh Read 1 or 2 data bytes 3

NOTES:

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

2. In continuous conversion mode, a Stop Convert T command will halt continuous conversion. To

restart, the Start Convert T command must be issued. In one-shot mode, a Start Convert T command

must be issued for every temperature reading desired.

3. If the user only desires 8-bit thermometer readings, the master need only read 1 data byte and follow

with a NACK and STOP. If higher resolution is required, 2 bytes must be read.

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