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DS1821S/TR Scheda tecnica(PDF) 14 Page - Dallas Semiconductor

Il numero della parte DS1821S/TR
Spiegazioni elettronici  Programmable Digital Thermostat and Thermometer
PDF  18 Pages
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Produttore elettronici  DALLAS [Dallas Semiconductor]
Homepage  https://www.maximintegrated.com/en.html
Logo DALLAS - Dallas Semiconductor

DS1821S/TR Scheda tecnica(HTML) 14 Page - Dallas Semiconductor

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DS1821
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DS1821 OPERATION EXAMPLE
In this example, the master device programs the DS1821 with TL = +10°C and TH = +40°C 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 pulse.
RX
Presence
DS1821 responds with presence pulse.
TX
01h
Master issues Write TH command.
TX
28h
Master sends data for TH = +40°C.
TX
Reset
Master issues reset pulse.
RX
Presence
DS1821 responds with presence pulse.
TX
02h
Master issues Write TL command.
TX
0Ah
Master sends data for TL = +10°C.
TX
Reset
Master issues reset pulse.
RX
Presence
DS1821 responds with presence pulse.
TX
A1h
Master issues Read TH command.
RX
28h
Master reads stored TH value to verify data.
TX
Reset
Master issues reset pulse.
RX
Presence
DS1821 responds with presence pulse.
TX
A2h
Master issues Read TL command.
RX
0Ah
Master reads stored TL value to verify data.
TX
Reset
Master issues reset pulse.
RX
Presence
DS1821 responds with presence pulse.
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 output).
⎯
⎯
Power is cycled; DS1821 powers-up in thermostat mode.



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