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 DS1835 
 Temperature sensors 

High-accuracy 1‑Wire temperature sensor designed for precise measurements in electronics, automation, and control systems.

 Maximum precision
+/- 2,0°K

 Minimum temperature
-40°C

 Maximum temperature
+85°C

 Minimum dimensions
4 x 6 x 27

 Response time
Medium

 Self-heating
Medium

 Price
Medium

Drift
Low

What is a DS2835 sensor ?Operating principleTechnical specificationsWiring configurationSelf-heatingApplication areas

What is a DS2835 sensor ?

The DS1835 from Maxim Integrated is a 1-Wire interface supervision circuit.

It includes:

  • a calibrated digital temperature sensor,
  • a voltage reset circuit (watchdog),
  • an internal EEPROM to store data or configurations.

It is aimed at embedded systems where temperature, voltage, and processor status need to be monitored, all through a single communication line.

Operating principle

The DS1835 measures the internal temperature and compares the supply voltage to a reset threshold; if the voltage drops, it automatically sends a RESET signal to protect the system.

The temperature is provided via the 1-Wire bus as follows:

T(°C) = Brut Value / 16

The data or states (alarm, flags) can be stored in the 256-bit EEPROM.

Technical specifications

Parameter Typical value
Measurement range −40 → +85 °C
Typical precision ±2 K
Resolution 0.125 °C (10 bits)
Threshold reset 4.63 V (version R-10) / 3.08 V (version R-5)
Reset delay 250 ms (typ.)
Interface 1-Wire Digital
EEPROM 256 bits (read/write)
Case TO-92 or SOT-223

Annual drift

Average (±0.5 K/year)

Wiring Configuration

Type Description

VDD

Main food source

GND

Mass

DQ

1-Wire Line (communication)

RESET

Surveillance tension exit

VOUT

Supervised tension / memory output

Self-heating

Low (< 0.3 °C).

The thermal impact is almost negligible, with the casing effectively dissipating heat.

Application areas

⚙️ Supervision of industrial or embedded power supplies

🔋 Protection of microcontrollers / IoT boards

🧠 Systems requiring temperature + reset + local storage

🧱 Critical applications (safety, energy, monitoring)




Should I choose a DS1835 sensor ?

Strengths points

  • ⚙️ Three functions in one single component
         → LThe DS1835 combines temperature measurement, voltage supervision (reset), and integrated EEPROM, which significantly simplifies the electronics of an embedded system.
  • 🔗 Universal 1-Wire Interface
         → Compatible with the libraries and buses of the DS18B20, it can integrate into an existing network of sensors while adding system control functions.
  • 🧠 Integrated microcontroller protection
         → The automatic reset circuit protects the board in case of voltage drop or crash, preventing memory corruption and erratic restarts.
DS1835 sensors

Weaknesses points

  • 🌡️ Average thermal precision
    → With an accuracy of ±2 K, it does not compete with purely thermal sensors (such as the DS18B20 or the DS28EA00).
  • 💾 Limited memory capacity
         → The integrated EEPROM (256 bits) is sufficient for configurations, but not for massive storage.
  • 💰 Higher cost than a simple sensor
    → Its combined functions (reset, memory, temperature) make it a more expensive component — relevant only if these three functions are useful together.

Useful information

Here is some useful information regarding the DS1835 sensors.

The DS1835 uses a 10-bit ADC converter for temperature measurement, identical to that of the DS2438, and features a built-in comparator for voltage monitoring.

Measure
 Resolution Typical accuracy (−10 → +85 °C)
 Remarks
Temperature 10 bits (0,125 °C) ±2,0 K Internal measurement, factory calibrated
Reset voltage
 — ±1 % Automatic triggering according to model
EEPROM 256 bits — Non-volatile data storage
Annual drift
 — ±0.5 K/year (temperature sensor) Correct stability for monitoring
🔹 Notes:
  • The temperature is available via the 1-Wire bus.
  • The reset threshold (Vtrip) depends on the version (3.08 V / 4.63 V).
  • Stable drift due to the internal compensation of the voltage comparator.

🔹 Temperature Measurement

The DS1835 returns a 10-bit binary value, identical to that of the DS2438.

The conversion equation is therefore:

T(°C) = Raw Value / 16


Example:

Raw value = 0x0780 = 1920

T = 1920 / 16 = 120 °C


✅ Measured temperature = 120 °C


🔹 Low voltage detection (Reset)

The DS1835 continuously compares the supply voltage VDD to its trigger threshold (Vtrip).

RESET = { LOW, if VDD < Vtrip 

​ ​   { HIGH, if VDD > Vtrip

Version
 Threshold Reset (Vtrip)
 Typical tolerance
DS1835-5 3,08 V ±1 %
DS1835-10 4,63 V ±1 %
✅ When a voltage drop is detected, the RESET output goes low for approximately 250 ms, ensuring a clean restart of the microcontroller.

🔹 EEPROM Memory

The internal EEPROM of 256 bits (32 bytes) can hold:

  • custom thresholds,
  • system identifiers,
  • or calibration data.

Writing and reading are done via the 1-Wire bus, with a typical cycle of 10 ms per write.

Le DS1835 s’intègre directement entre le microcontrôleur et l’alimentation.

Il supervise la tension, fournit un signal RESET, mesure la température interne et communique via 1-Wire.

🔹 Composants typiques

Composant Fonction
DS1835 Capteur T°, superviseur de tension, EEPROM
Résistance de tirage (4,7 kΩ) Maintient la ligne DATA à l’état haut
Microcontrôleur (ESP32, STM32, etc.) Maître 1-Wire, surveillé par le DS1835
Alimentation 3,3 V / 5 V Source VDD supervisée
Condensateur de découplage (100 nF) Filtrage de tension
🔹 Schéma fonctionnel (ASCII)
          +5V / +3.3V
              │
             [C1]
              │
           ┌──────────────┐
           │   DS1835     │
           │──────────────│
           │ VDD     RESET│───► µC Reset
DATA ──────│ DQ           │
GND  ──────│ GND          │
           └──────────────┘
              │
             GND

💡 Le DS1835 surveille la tension VDD et relance le microcontrôleur si une chute est détectée, tout en fournissant la température sur le bus 1-Wire.

🔹 Principe de fonctionnement

1️⃣ Le DS1835 surveille la tension d’alim (VDD).

2️⃣ Si elle chute sous le seuil Vtrip, le signal RESET passe à 0.

3️⃣ Une fois la tension revenue à la normale, le reset reste actif 250 ms.

4️⃣ En parallèle, le capteur de température interne est accessible via le bus 1-Wire (commande 0x44).

Chaque DS1835 possède un identifiant unique 64 bits (code famille 0x18), ce qui permet de l’intégrer à un réseau 1-Wire mixte avec des DS18B20, DS2438, etc.

Fonction Description
Surveillance tension + température Idéal pour systèmes sensibles (énergie, data, IoT)
EEPROM intégrée Stockage de configuration ou ID
Signal Reset matériel Protection automatique du microcontrôleur
Adressage 1-Wire unique Identification sur bus partagé
Exemple d’adresse unique :
18-FF-2B-9D-47-17-03-4E
✅ Permet d’identifier chaque module tout en sécurisant l’alimentation.

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