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Analog Devices Inc./Maxim Integrated DS1631Z+
- Part No.:
- DS1631Z+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Analog and Digital Output
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
DS1631Z+.pdf
- Description:
- SENSOR DIGITAL -55C-125C 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:500
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Product details
Overview
DS1631Z+ from Maxim Integrated is a high-precision digital thermometer and thermostat IC with ±0.5°C accuracy from 0°C to +70°C, 9–12-bit user-selectable resolution, and integrated nonvolatile TH/TL trip-point registers. It operates over -55°C to +125°C on 2.7V–5.5V supply and delivers push-pull TOUT output for direct thermal control in space-constrained embedded systems.
For engineers reviewing the DS1631Z+ datasheet, DS1631Z+ pinout, DS1631Z+ application, or DS1631Z+ equivalent, this page provides verified technical context, validated pin functions, confirmed I²C timing compliance (400kHz), real-world thermostat hysteresis implementation, and accurate alternative part comparisons - all specific to the DS1631Z+ SO package variant.
Technical Context
The DS1631Z+ implements a bandgap-based temperature sensor paired with a delta-sigma ADC, enabling calibrated 16-bit two's complement temperature readings. Its configuration register controls resolution (R0/R1 bits), TOUT polarity (POL), and conversion mode (1SHOT), with POL and 1SHOT stored in EEPROM for power-up persistence.
Communication occurs via a standard 2-wire (I²C-compatible) interface with open-drain SDA and push-pull TOUT, supporting up to eight devices on one bus using A0–A2 address pins. The device supports both continuous and one-shot conversion modes, with conversion times ranging from 93.75ms (9-bit) to 750ms (12-bit).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Accuracy | ±0.5°C from 0°C to +70°C at 3.0–5.5V - enables reliable thermal monitoring without external calibration in commercial-grade systems. |
| Temperature Range | -55°C to +125°C - supports operation in industrial, telecom, and automotive under-hood environments. |
| Resolution | User-selectable 9–12 bits (0.5°C to 0.0625°C step) - allows trade-off between precision and conversion speed per system timing requirements. |
| I²C Speed | Up to 400kHz clock frequency - compatible with standard-mode I²C controllers without timing margin concerns. |
| Supply Voltage | 2.7V to 5.5V - interoperable with 3.3V and 5V logic domains without level-shifting. |
| Standby Current | 800nA at 0°C to +70°C - suitable for battery-powered portable products requiring ultra-low quiescent power. |
| EEPROM Endurance | 50,000 write cycles with 10-year data retention - ensures robust field-programmability of TH/TL thresholds and configuration bits. |
Pinout & Package
DS1631Z+ is packaged in an 8-pin SO (Small Outline) package, 150mil or 208mil body width, surface-mount compatible with standard reflow profiles (peak 220°C). Pin 1 is marked with a dot or beveled edge.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (SDA) | Data I/O for 2-wire interface | Open-drain bidirectional line requiring external pullup; supports multidrop I²C bus with up to 8 devices. |
| 2 (SCL) | Clock input | CMOS-compatible input accepting 0–400kHz clock; no internal pullup - master must drive or pull up. |
| 3 (TOUT) | Thermostat output | Push-pull active-high/low output (configurable via POL bit); drives logic-level loads directly without external transistor. |
| 4 (GND) | Ground reference | Primary return path for analog and digital circuitry; must be low-impedance connection to system ground plane. |
| 5 (A2) | Device address bit | Logic-level input (0 or VDD) setting MSB of 7-bit slave address (1001A2A1A0); enables unique addressing in multidrop systems. |
| 6 (A1) | Device address bit | Logic-level input setting middle bit of slave address; combined with A2/A0, defines one of eight possible I²C addresses. |
| 7 (A0) | Device address bit | Logic-level input setting LSB of slave address; determines device identity on shared I²C bus. |
| 8 (VDD) | Power supply | +2.7V to +5.5V supply input; bypass capacitor (0.1µF ceramic) required near pin for noise immunity during conversions. |
Key Features
| Feature | Design Value |
|---|---|
| Nonvolatile TH/TL registers | EEPROM-stored upper/lower trip points retain settings across power cycles - eliminates need for host MCU reprogramming at startup. |
| Configurable TOUT polarity | POL bit in configuration register selects active-high or active-low thermostat output - simplifies interface to existing control logic or relay drivers. |
| Temperature high/low flags (THF/TLF) | SRAM bits record if temperature ever exceeded TH or fell below TL since power-on - enables fault logging without continuous polling. |
| Software POR command | 0x54 command resets all registers and logic to power-up state - allows deterministic recovery without hardware reset line. |
| 12-bit default resolution | Power-up resolution is 12 bits (0.0625°C steps), with conversion time 750ms - balances precision and responsiveness for most thermal management tasks. |
Applications
| Network Routers and Switches | Cellular Base Stations |
|---|---|
Use Scenario: Real-time junction temperature monitoring of FPGAs, ASICs, and power amplifiers in high-density PCB layouts. IC Role / Device Role / Timing Role: Standalone digital thermometer and hardware thermostat providing autonomous overtemperature shutdown via TOUT signal. Use Value: Prevents thermal throttling or damage by triggering fan control or power-down before silicon exceeds safe operating limits - no firmware intervention required. |
Use Scenario: Ambient and RF power stage temperature supervision in outdoor macrocell and small-cell base station enclosures. IC Role / Device Role / Timing Role: I²C-connected remote sensor feeding thermal data to system controller while delivering independent alarm signaling via TOUT. Use Value: Enables adaptive cooling and predictive maintenance through precise drift tracking across -40°C to +85°C operating range. |
| Portable Products | Space-Constrained Thermally Sensitive Products |
Use Scenario: Battery pack and charging circuit thermal safety in smartphones, tablets, and wearables. IC Role / Device Role / Timing Role: Low-power (800nA standby) temperature monitor with NV-configured trip points, operating autonomously after initial setup. Use Value: Guarantees UL/IEC thermal cutoff compliance without consuming MCU resources or battery capacity during idle periods. |
Use Scenario: Thermal protection of compact DC-DC converters, LED drivers, and optocoupler-isolated interfaces in medical or industrial modules. IC Role / Device Role / Timing Role: Direct-coupled thermostat with push-pull TOUT driving MOSFET gate or opto-LED, eliminating discrete comparator and reference components. Use Value: Reduces BOM count and board area by integrating sensing, decision logic, and output drive in a single 8-pin SO package. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar digital thermometer and thermostat applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| DS1631S+ | Identical electrical specs and pinout; differs only in SO package width (208mil vs. DS1631Z+'s 150mil) - same die, same functionality. | Same use cases; selected when board layout requires wider SO footprint or legacy footprint compatibility. | Drop-in replacement for DS1631Z+ where 208mil SO pad spacing is specified; verify land pattern match before substitution. |
| MAX31820 | 1-Wire interface (not I²C), ±0.5°C accuracy over -10°C to +85°C, no TOUT pin - requires host polling instead of autonomous alarm output. | Lacks hardware thermostat output; suited for point-sensing where microcontroller handles alarm logic, not for standalone thermal cutoff. | Choose when 1-Wire infrastructure exists and TOUT autonomy is unnecessary; avoid when push-pull hardware alarm is required. |
Compared with DS1631Z+, DS1631S+ offers identical thermal performance and I²C functionality in a mechanically distinct SO package, while MAX31820 replaces I²C with 1-Wire and removes autonomous TOUT - making DS1631Z+ uniquely suited for space-limited designs needing self-contained thermal control.
Availability
DS1631Z+ is available at Aetrix Electronics and suitable for network infrastructure, cellular base station thermal management, and portable electronics requiring stable component supply with guaranteed long-term availability.
Supply support for DS1631Z+ includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Maxim Integrated (now part of Analog Devices) is a semiconductor company specializing in precision analog, mixed-signal, and high-reliability ICs for industrial, communications, and computing applications.
The DS1631Z+ belongs to Maxim's precision temperature sensor product line, designed specifically for embedded thermal monitoring and autonomous hardware-based thermal protection in resource-constrained systems.
FAQ
What is the operating voltage range for DS1631Z+?
The DS1631Z+ operates from 2.7V to 5.5V DC supply voltage. This wide range allows direct interfacing with both 3.3V and 5V system rails without level translation. Operation below 2.7V is not guaranteed, and exceeding 5.5V may damage the device. The ±0.5°C accuracy specification applies only within 3.0V–5.5V at 0°C to +70°C ambient.
Does DS1631Z+ support multidrop I²C configurations?
Yes, DS1631Z+ supports multidrop I²C bus operation with up to eight devices. Addressing is controlled by the A0, A1, and A2 pins, which configure the three LSBs of the 7-bit slave address (1001A2A1A0). Each DS1631Z+ on the bus must have a unique combination of A0–A2 logic levels to avoid address collisions during communication.
How does the TOUT pin function on DS1631Z+?
The TOUT pin on DS1631Z+ is a push-pull output that asserts based on comparison of measured temperature against user-programmed TH and TL registers. Its active state (high or low) is configurable via the POL bit in the configuration register. TOUT updates after each temperature conversion and maintains its state until the next conversion completes - enabling direct connection to enable inputs, reset lines, or relay drivers.
Can DS1631Z+ operate as a standalone thermostat without a microcontroller?
No - the DS1631Z+ variant does not auto-start conversions at power-up. Unlike the DS1631A, the DS1631Z+ requires a Start Convert T command (0x51) to initiate measurements. However, once configured (TH/TL, POL, 1SHOT), it can provide autonomous TOUT behavior during continuous conversion mode, reducing host MCU polling overhead.
What is the conversion time for DS1631Z+ at 12-bit resolution?
At 12-bit resolution, DS1631Z+ requires a maximum of 750ms per temperature conversion. This value is specified in the datasheet's AC Electrical Characteristics table and scales predictably: 9-bit = 93.75ms, 10-bit = 187.5ms, 11-bit = 375ms. Conversion time doubles with each added bit due to increased ADC oversampling requirements.
DS1631Z+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Sensor Type:
- Digital, Local
- Sensing Temperature - Local:
- -55°C ~ 125°C
- Sensing Temperature - Remote:
- -
- Output Type:
- I2C
- Voltage - Supply:
- 2.7V ~ 5.5V
- Resolution:
- 11 b
- Features:
- One-Shot, Output Switch, Programmable Limit, Programmable Resolution, Standby Mode
- Accuracy - Highest (Lowest):
- ±0.5°C (±2°C)
- Test Condition:
- 0°C ~ 70°C (-55°C ~ 125°C)
- Operating Temperature:
- -55°C ~ 125°C
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
- Supplier Device Package:
- 8-SOIC
DS1631Z+ FAQ
1.How can I place an order for DS1631Z+ through Aetrix?
Please submit a Request for Quotation (RFQ) for DS1631Z+ on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for DS1631Z+ reliable?
The price and inventory of DS1631Z+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for DS1631Z+ is usually 5 days.
3.What payment methods are accepted for DS1631Z+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for DS1631Z+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for DS1631Z+?
DS1631Z+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your DS1631Z+ order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for DS1631Z+?
For technical support, including DS1631Z+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your DS1631Z+ requirements.
6.How does Aetrix verify that DS1631Z+ is sourced from the original manufacturer or authorized distributors?
All DS1631Z+ products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that DS1631Z+ meets industry standards.
7.What is the process for return or replacement of DS1631Z+?
All DS1631Z+ units undergo pre-shipment inspection (PSI). If there is an issue with DS1631Z+, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The DS1631Z+ part is unused and in its original packaging.
Return procedure for DS1631Z+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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