Rainbow Electronics DS1721 User Manual
Page 11
DS1721
11 of 16
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
REGISTER COMMANDS
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.