DS1621

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measurement will be completed and the DS1621 will remain idle until a Start Convert T is issued to

resume continuous operation.

DS1621 COMMAND SET Table 3

INSTRUCTION

DESCRIPTION

PROTOCOL

2-WIRE BUS DATA

AFTER ISSUING

PROTOCOL

NOTES

TEMPERATURE CONVERSION COMMANDS

Read Temperature

Read last converted temperature

value from temperature register.

AAh

<read 2 bytes data>

Read Counter

Reads value of count remaining

from counter.

A8h

<read data>

Read Slope

Reads value of the slope

accumulator.

A9h

<read data>

Start Convert T

Initiates temperature

conversion.

EEh

idle

1

Stop Convert T

Halts temperature conversion.

22h

idle

1

THERMOSTAT COMMANDS

Access TH

Reads or writes high

temperature limit value into TH

register.

A1h

<write data>

2

Access TL

Reads or writes low

temperature limit value into TL

register.

A2h

<write data>

2

Access Config

Reads or writes configuration

data to configuration register.

ACh

<write data>

2

NOTES:

1. 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.

2. Writing to the E

further writes should be requested for at least 10 ms.