DS18S20-PAR+T&R Maxim Integrated Products, DS18S20-PAR+T&R Datasheet - Page 16

• Manufacturer Part Number: DS18S20-PAR+T&R
• Description: Board Mount Temperature Sensors Prgmble Resolution 1-Wire Parasite Pwr
• Manufacturer: Maxim Integrated Products

Specifications of DS18S20-PAR+T&R

• Full Temp Accuracy: +/- 0.5 C
• Package / Case: TO-92
• Digital Output - Bus Interface: Serial (1-Wire)
• Digital Output - Number Of Bits: 9 bit
• Maximum Operating Temperature: + 100 C
• Minimum Operating Temperature: - 55 C
• Output Type: Digital
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

DS18S20-PAR OPERATION EXAMPLE 1
In this example there is only one DS18S20-PAR on the bus. The master writes to the T
in the DS18S20-PAR scratchpad and then reads the scratchpad and recalculates the CRC to verify the
data. The master then copies the scratchpad contents to EEPROM.
MASTER MODE
RX
RX
RX
RX
TX
TX
TX
TX
TX
TX
TX
TX
TX
TX
TX
DATA (LSB FIRST)
DQ line held high by
strong pullup
2 data bytes
9 data bytes
Presence
Presence
Presence
Reset
Reset
Reset
CCh
CCh
BEh
CCh
4Eh
48h
Master issues reset pulse.
DS18S20-PAR responds with presence pulse.
Master issues Skip ROM command.
Master issues Write Scratchpad command.
Master sends two data bytes to scratchpad (T
Master issues reset pulse.
DS18S20-PAR responds with presence pulse.
Master issues Skip ROM command.
Master issues Read Scratchpad command.
Master reads entire scratchpad including CRC. The master then
recalculates the CRC of the first eight data bytes from the
scratchpad and compares the calculated CRC with the read CRC
(byte 9). If they match, the master continues; if not, the read
operation is repeated.
Master issues reset pulse.
DS18S20-PAR responds with presence pulse.
Master issues Skip ROM command.
Master issues Copy Scratchpad command.
Master applies strong pullup to DQ for at least 10 ms while copy
operation is in progress.
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COMMENTS
H
H
and T
and T
L
).
L
registers