DS18S20+PAR Maxim Integrated Products, DS18S20+PAR Datasheet - Page 19

• Manufacturer Part Number: DS18S20+PAR
• Description: Board Mount Temperature Sensors PARASITE POW DIG THERMOMETER 1-WR
• Manufacturer: Maxim Integrated Products

Specifications of DS18S20+PAR

• 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
• Ic Output Type: Digital
• Sensing Accuracy Range: ± 0.5°C
• Supply Current: 1mA
• Supply Voltage Range: 3V To 5.5V
• Resolution (bits): 9bit
• Sensor Case Style: TO-92
• No. Of Pins: 3
• Accuracy %: 0.5°C
• Rohs Compliant: Yes
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

DS18S20 OPERATION EXAMPLE 3
In this example there is only one DS18S20 on the bus and it is using parasite power. The bus master
initiates a temperature conversion then reads the DS18S20 scratchpad and calculates a higher resolution
result using the data from the temperature, COUNT REMAIN and COUNT PER °C registers.
MASTER MODE
Tx
Tx
Tx
Tx
Tx
Tx
Rx
Tx
Tx
Rx
Tx
Rx
—
DATA (LSB FIRST)
DQ line held high by
strong pullup
9 data bytes
Presence
Presence
Presence
Reset
Reset
Reset
CCh
CCh
BEh
44h
—
Master issues reset pulse.
DS18S20 responds with presence pulse.
Master issues Skip ROM command.
Master issues Convert T command.
Master applies strong pullup to DQ for the duration of the
conversion (t
Master issues reset pulse.
DS18S20 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. The master also calculates the
TEMP_READ value and stores the contents of the COUNT
REMAIN and COUNT PER °C registers.
Master issues reset pulse.
DS18S20 responds with presence pulse.
CPU calculates extended resolution temperature using the
equation in the Operation—Measuring Temperature section.
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CONV
).
COMMENTS
DS18S20