DS1821
 
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DS1821 OPERATION EXAMPLE  
In this example, the master device programs the DS1821 with T
L
 = +10癈 and T
H
 = +40癈 and verifies
that the data has been saved correctly. The master then programs the status/configuration register so that
the device will power-up in thermostat mode (T/R  ?= 1) and the thermostat output will have active high
polarity (POL = 1).
MASTER
MODE
DATA (LSB
FIRST
COMMENTS
TX
Reset
Master issues reset   ulse.
RX
Presence
DS1821 res  onds with resence   ulse.
TX
01h
Master issues Write TH command.
TX
28h
Master sends data for T
H
 = +40癈.
TX
Reset
Master issues reset   ulse.
RX
Presence
DS1821 res  onds with resence   ulse.
TX
02h
Master issues Write TL command.
TX
0Ah
Master sends data for T
L
 = +10癈.
TX
Reset
Master issues reset   ulse.
RX
Presence
DS1821 res  onds with resence   ulse.
TX
A1h
Master issues Read TH command.
RX
28h
Master reads stored T
H
 value to verif data.
TX
Reset
Master issues reset   ulse.
RX
Presence
DS1821 res  onds with resence   ulse.
TX
A2h
Master issues Read TL command.
RX
0Ah
Master reads stored T
L
 value to verif data.
TX
Reset
Master issues reset   ulse.
RX
Presence
DS1821 res  onds with resence   ulse.
TX
0Ch
Master issues Write Status command.
TX
06h
Master sends status/configuration data to the DS1821 with T/R  ?=
1 (thermostat mode at power-up) and POL = 1 (active high
thermostat out  ut .
?
?
Power is c  cled; DS1821   owers-u   in thermostat mode.
 
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