DS18S20Z+ Maxim Integrated Products, DS18S20Z+ Datasheet - Page 18
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DS18S20Z+
Manufacturer Part Number
DS18S20Z+
Description
Board Mount Temperature Sensors IC THERM MICROLAN HI-PREC
Manufacturer
Maxim Integrated Products
Datasheet
1.DS18S20Z.pdf
(23 pages)
Specifications of DS18S20Z+
Temperature Threshold
Programmable
Full Temp Accuracy
+/- 0.5 C
Package / Case
SOIC-8
Digital Output - Bus Interface
1-Wire
Digital Output - Number Of Bits
9 bit
Supply Voltage (max)
5.5 V
Supply Voltage (min)
3 V
Maximum Operating Temperature
+ 125 C
Minimum Operating Temperature
- 55 C
Output Type
Digital
Supply Current
1.5 mA
Ic Output Type
Digital
Sensing Accuracy Range
± 0.5°C
Supply Voltage Range
3V To 5.5V
Resolution (bits)
9bit
Sensor Case Style
SOIC
No. Of Pins
8
Filter Terminals
SMD
Rohs Compliant
Yes
Temperature Sensing Range
-55°C To +125°C
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
DS18S20 OPERATION EXAMPLE 1
In this example there are multiple DS18S20s on the bus and they are using parasite power. The bus
master initiates a temperature conversion in a specific DS18S20 and then reads its scratchpad and
recalculates the CRC to verify the data.
DS18S20 OPERATION EXAMPLE 2
In this example there is only one DS18S20 on the bus and it is using parasite power. The master writes to
the T
CRC to verify the data. The master then copies the scratchpad contents to EEPROM.
MASTER MODE
MASTER MODE
H
and T
Tx
Rx
Tx
Tx
Tx
Tx
Tx
Rx
Tx
Tx
Tx
Rx
Tx
Rx
Tx
Tx
Tx
Tx
Rx
Tx
Tx
Rx
Tx
Rx
Tx
Tx
Tx
L
registers in the DS18S20 scratchpad and then reads the scratchpad and recalculates the
DATA (LSB FIRST)
DATA (LSB FIRST)
DQ line held high by
DQ line held high by
64-bit ROM code
64-bit ROM code
strong pullup
strong pullup
9 data bytes
2 data bytes
9 data bytes
Presence
Presence
Presence
Presence
Presence
Reset
Reset
Reset
Reset
Reset
BEh
CCh
CCh
CCh
55h
44h
55h
BEh
4Eh
48h
Master issues reset pulse.
DS18S20s respond with presence pulse.
Master issues Match ROM command.
Master sends DS18S20 ROM code.
Master issues Convert T command.
Master applies strong pullup to DQ for the duration of the
conversion (t
Master issues reset pulse.
DS18S20s respond with presence pulse.
Master issues Match ROM command.
Master sends DS18S20 ROM code.
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 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 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 responds with presence pulse.
Master issues Skip ROM command.
Master issues Copy Scratchpad command.
Master applies strong pullup to DQ for at least 10ms while
copy operation is in progress.
18 of 23
CONV
).
COMMENTS
COMMENTS
H
and T
L
)
DS18S20