Match the reference to the application.
The host is designed for DS18S20 temperature data and commands. Preserve its native decoding and any documented extended-resolution calculation.
Review the specification →GUILCOR · Digital sensing
DS18S20
temperature sensors
A 1-Wire thermometer with a native 9-bit temperature result. It is useful in installations designed around this device, but the temperature scale and scratchpad interpretation differ from those of the DS18B20.
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Understand the reference
Decode the correct register format.
For the native reading, interpret the complete temperature word as signed two’s complement and divide by 2. Extended resolution uses TEMP_READ with the half-degree bit removed, COUNT_REMAIN and COUNT_PER_C; the DS18S20 fixes COUNT_PER_C at 16. Extra calculated digits do not improve the accuracy specification.
SELECTION / YOUR APPLICATION
Is DS18S20 the right starting point?
Review DS1822 alongside DS18S20.
Compare the sensing function, power arrangement, command set and conversion timing. A common 1-Wire bus does not make all devices equivalent to the host software.
Explore DS1822 →Keep the complete specification together.
Keep the full device reference, host implementation and wiring layout. Check supply or parasite power, conversion requirements and how individual devices are identified.
Prepare your enquiry →These links support a specification review. They do not establish interchangeable parts or availability of a complete assembly.
Interactive application guide
Decode a native DS18S20 reading.
Enter the four hexadecimal digits of the full temperature word, MSB first. This checks native decoding only; it does not check the scratchpad CRC or conversion completion.
Signed register value
Native temperature
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T = signed16(word) / 2; extended T = TEMP_READ − 0.25 + (COUNT_PER_C − COUNT_REMAIN) / COUNT_PER_C
Technical reference
Reference details for the application.
| IC temperature range | −55 to +125 °C |
|---|---|
| Accuracy interval | ±0.5 °C from −10 to +85 °C |
| Native resolution | 9 bits / 0.5 °C |
| Conversion time, maximum | 750 ms |
| External supply | 3.0 to 5.5 V |
| ROM family code | 0x10 |
Apply the limits to the right component.
The sensing IC, finished probe and host electronics have separate requirements. Cable insulation, sealing, connector, supply and mounting may impose a narrower operating range. A temperature step is not an accuracy guarantee, and an electronic conversion time is not a thermal response time.
Existing building controls and embedded equipment can retain this reference where the master, software and power mode are already designed for it.
Wiring and power
Specify wiring, power and the host together.
Device connections
Use DQ, GND and VDD for external supply, or connect VDD to GND for parasite power with the required strong pullup. A library must explicitly support the DS18S20 format rather than applying the DS18B20 scale.
Bus integration
Choose the pullup and master from the selected device requirements and measured network behaviour. A resistor value taken from an example is not a universal design rule. Check logic levels, ground reference, noise exposure and the voltage at the furthest sensor.
Cable colours and a familiar package are not a pinout. Use the connector drawing and exact part document. Record the relationship between each ROM identity and its installed location; update that mapping after replacement.
Acquisition sequence
Make each reading traceable.
Discover
Inventory the bus and select the intended device identity.
Convert
Issue the device-specific command and satisfy its timing and power needs.
Validate
Read the correct registers, check CRC where provided and reject invalid or stale results.
Use
Apply the correct scale, location mapping and application limits.
Measurement quality
Separate electrical behaviour from thermal performance.
Accuracy and calibration
Choose the error limit over the actual operating interval. Add installation and readout effects. Define any calibration and periodic verification required by the application; factory calibration does not establish a universal no-maintenance policy.
Response and mounting
A sheath, potting material and mounting contact change how fast the sensing element follows the medium. Verify response in the intended flow and installation, rather than using conversion time as the finished-probe response.
Power and self-heating
Average dissipation depends on supply, conversion duty and surrounding electronics. Test the assembled probe at the intended reading rate. Do not assume a universal self-heating offset from the interface name.
Form factor library
Choose your probe format.
Choose the shape and mounting for the measurement point. These are GUILCOR probe families and a design service; confirm the compatible element, dimensions, cable and complete assembly for the selected reference.
Frequently asked questions
Questions before specifying the assembly.
Can I decode it with the DS18B20 formula?
No. Native DS18S20 temperature uses a half-degree scale. Decode the correct device family and validate the complete scratchpad before using the result.
Does 1-Wire literally need only one conductor?
Communication needs the data line and a ground reference. External power can add a supply conductor; parasite power has specific strong-pullup and timing requirements.
How many sensors can share the cable?
Addressing supports multiple devices, but the practical limit depends on the master, loading, wiring, power and timing. Validate the actual network rather than selecting a count from the protocol name.
What should I send for a probe quotation?
Send the reference, temperature interval, required error and response, mounting drawing, cable and connector details, host interface, quantity and any calibration requirement.
Technical sources
Continue with the reference documents.
GUILCOR / YOUR ENQUIRY
Define your DS18S20 enquiry.
Send the device reference, host and wiring arrangement together. Include how the sensor is powered and how measurements are scheduled across the bus.
Missing a reference or datasheet?
Send the component marking, equipment reference and any photographs or documents you have. These provide a starting point for identifying what must be confirmed.
The outline helps prepare your enquiry. Copying it does not send a request.
FOUR DETAILS THAT MOVE THE DISCUSSION FORWARD
01
Device and 1-Wire host
Exact device reference, host or master, supply arrangement, pullup implementation, command support and required update interval.
02
Measurement conditions
Measured quantity, temperature interval, required accuracy, conversion timing, sensor count and identification or position requirements.
03
Assembly and connection
Cable lengths, topology and branches, connector and grounding, probe mounting, materials and environmental exposure.
04
Project and validation
Sample and production quantities, target delivery, calibration or documentation needs, and the checks required before approval.