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Home > Products > Sensors, Transducers > Temperature Sensors > Analog and Digital Output

Analog Devices Inc./Maxim Integrated DS1722S+T&R

Name: DS1722S+T&R
Brand: Analog Devices Inc./Maxim Integrated
SKU: DS1722S+T&R
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: DS1722S+T&R

Manufacturer:: Analog Devices Inc./Maxim Integrated

Category:: Analog and Digital Output

Package:: 8-SOIC (0.154", 3.90mm Width)

Datasheet:: DS1722S+T&R.pdf

Description:: SENSOR DIGITAL -55C-120C 8SOIC

Quantity:: RFQ Add To RFQ list

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Product details

Overview

DS1722S+T&R from Maxim Integrated (now Analog Devices) is a digital thermometer IC with SPI/3-wire serial interface, measuring temperature from −55°C to +120°C with ±2.0°C accuracy over −40°C to +85°C, 8–12-bit configurable resolution (0.0625°C min), and dual supply rails (VDDA: 2.65–5.5V, VDDD: 1.8–5.5V). It serves as a self-contained temperature-to-digital converter in thermal monitoring circuits for embedded systems.

For engineers reviewing the DS1722S+T&R datasheet, DS1722S+T&R pinout, DS1722S+T&R application, or DS1722S+T&R equivalent, key selection considerations include its lead-free 8-pin SOIC (150mil) package, selectable SPI vs. 3-wire interface via SERMODE pin, shutdown mode with 0.5–1.0 µA current, and factory-calibrated sensor requiring no external components.

Technical Context

The DS1722S+T&R integrates a precision on-chip temperature sensor, successive-approximation ADC, and dual-mode serial interface logic. Its configuration register (address 00h) controls resolution (R2–R0), one-shot vs. continuous conversion (1SHOT/SD bits), and defaults to 9-bit resolution (1.0°C) and shutdown mode at power-up.

Interface selection is hardware-driven: SERMODE tied to VDDD enables SPI (MSb-first, CE/SCLK/SDI/SDO), while tied to GND enables 3-wire mode (LSb-first, SDI/SDO shorted). Conversion time scales with resolution - 75 ms (8-bit) to 1200 ms (12-bit) - and data is stored in two's complement format across registers 01h (LSB) and 02h (MSB).

Key Specifications

Parameter	Value and Actual Design Meaning
Temperature Range	−55°C to +120°C; supports industrial and computing environments with extended thermal margins.
Accuracy	±2.0°C (−40°C to +85°C); ensures reliable thermal threshold detection without system-level calibration.
Resolution	Configurable 8–12 bits (1.0°C to 0.0625°C); enables trade-off between precision and conversion latency per application need.
Analog Supply (VDDA)	2.65V–5.5V; powers internal sensor and ADC, compatible with 3.3V and 5V analog domains.
Digital Supply (VDDD)	1.8V–5.5V; supports 1.8V logic I/O, enabling direct interfacing with low-voltage microcontrollers.
Shutdown Current	0.5 µA (2.65–3.3V VDDA); extends battery life in portable or always-on thermal monitors.
Interface Modes	SPI (Motorola-compatible) or standard 3-wire; selected by SERMODE pin voltage, eliminating firmware dependency.

Pinout & Package

DS1722S+T&R is housed in a lead-free, RoHS-compliant 8-pin SOIC package (150 mil width), with pins arranged in standard dual-in-line configuration. The package supports reflow soldering per JEDEC J-STD-020 and is rated for operation from −55°C to +125°C ambient.

Pin/Terminal	Circuit Role	Design Meaning
PIN 1 VDDD	Digital supply input	Defines logic high level for CE, SCLK, SERMODE, and SDI/SDO; decoupling required near pin.
PIN 2 CE	Chip enable input	Active-high signal initiating all SPI/3-wire transfers; must be held high during clock/data exchange.
PIN 3 SCLK	Serial clock input	Synchronizes bit transfer; polarity agnostic (samples on CE assertion); max 5 MHz frequency.
PIN 4 GND	Ground reference	Common return for analog and digital sections; separate ground plane recommended for noise immunity.
PIN 5 SDO	Serial data output	Outputs temperature/configuration data in SPI mode; high-Z when inactive or in 3-wire mode (tied to SDI).
PIN 6 SDI	Serial data input	Accepts address/data writes in SPI mode; functions as bidirectional I/O in 3-wire mode (tied to SDO).
PIN 7 SERMODE	Interface select input	Hardwired to VDDD for SPI, GND for 3-wire; determines MSb-first vs. LSb-first data framing and pin usage.
PIN 8 VDDA	Analog supply input	Powers temperature sensor and ADC; requires low-noise filtering; independent of VDDD for mixed-signal isolation.

Key Features

Feature	Design Value
No external components required	Factory-calibrated sensor and ADC eliminate trimming resistors, thermistors, or reference ICs.
Configurable conversion resolution	Runtime-selectable 8–12-bit resolution via configuration register, enabling optimization of speed vs. precision.
Dual independent supply rails	VDDA (2.65–5.5V) and VDDD (1.8–5.5V) allow coexistence with 1.8V controllers and 3.3/5V analog subsystems.
Hardware-selectable serial interface	SERMODE pin eliminates firmware configuration overhead and ensures deterministic interface behavior at boot.
Low-power shutdown mode	0.5 µA typical shutdown current enables integration into energy-sensitive applications like IoT sensors.

Applications

Server Thermal Management	Industrial PLC Temperature Sensing
Use Scenario: Real-time CPU/die temperature monitoring in rack-mounted servers to trigger dynamic throttling or fan control. IC Role / Device Role / Timing Role: Primary temperature-to-digital converter feeding thermal management unit (TMU) via SPI at 100 ms intervals. Use Value: ±2.0°C accuracy ensures safe operating margins; 12-bit resolution detects sub-degree thermal transients before thermal runaway.	Use Scenario: Ambient and module temperature sensing in programmable logic controller (PLC) backplanes exposed to wide industrial temperature swings. IC Role / Device Role / Timing Role: Standalone thermal monitor interfaced to ARM Cortex-M7 MCU via 3-wire bus in space-constrained DIN-rail enclosures. Use Value: −55°C to +120°C range covers extended industrial specs; dual supply allows 1.8V MCU I/O compatibility without level shifters.
Network Equipment Hot-Spot Detection	Medical Diagnostic Instrument Calibration
Use Scenario: Monitoring ASIC junction temperature in 5G baseband units where localized heating impacts RF performance. IC Role / Device Role / Timing Role: Localized sensor placed adjacent to heat-generating FPGA, reporting via SPI burst reads during maintenance windows. Use Value: 8-pin SOIC footprint minimizes PCB area; shutdown mode reduces standby power in idle link layers.	Use Scenario: Reference temperature measurement inside portable ultrasound or blood analyzer devices requiring traceable thermal stability. IC Role / Device Role / Timing Role: Calibration anchor sensor reading every 5 seconds during warm-up phase, stored in nonvolatile memory for drift compensation. Use Value: Factory calibration eliminates field recalibration; ±2.0°C accuracy meets IEC 60601-1 thermal safety thresholds.

Server Thermal Management

Industrial PLC Temperature Sensing

Use Scenario: Real-time CPU/die temperature monitoring in rack-mounted servers to trigger dynamic throttling or fan control.

IC Role / Device Role / Timing Role: Primary temperature-to-digital converter feeding thermal management unit (TMU) via SPI at 100 ms intervals.

Use Value: ±2.0°C accuracy ensures safe operating margins; 12-bit resolution detects sub-degree thermal transients before thermal runaway.

Use Scenario: Ambient and module temperature sensing in programmable logic controller (PLC) backplanes exposed to wide industrial temperature swings.

IC Role / Device Role / Timing Role: Standalone thermal monitor interfaced to ARM Cortex-M7 MCU via 3-wire bus in space-constrained DIN-rail enclosures.

Use Value: −55°C to +120°C range covers extended industrial specs; dual supply allows 1.8V MCU I/O compatibility without level shifters.

Network Equipment Hot-Spot Detection

Medical Diagnostic Instrument Calibration

Use Scenario: Monitoring ASIC junction temperature in 5G baseband units where localized heating impacts RF performance.

IC Role / Device Role / Timing Role: Localized sensor placed adjacent to heat-generating FPGA, reporting via SPI burst reads during maintenance windows.

Use Value: 8-pin SOIC footprint minimizes PCB area; shutdown mode reduces standby power in idle link layers.

Use Scenario: Reference temperature measurement inside portable ultrasound or blood analyzer devices requiring traceable thermal stability.

IC Role / Device Role / Timing Role: Calibration anchor sensor reading every 5 seconds during warm-up phase, stored in nonvolatile memory for drift compensation.

Use Value: Factory calibration eliminates field recalibration; ±2.0°C accuracy meets IEC 60601-1 thermal safety thresholds.

Equivalent & Alternatives

The following parts are listed as comparable options for similar digital thermometer applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
MAX31820 (Analog Devices)	1-Wire interface only; 12-bit resolution; ±0.5°C accuracy (−10°C to +85°C); no SERMODE pin or dual supply.	Requires 1-Wire master; better accuracy in narrow range but lacks SPI/3-wire flexibility and extended −55°C rating.	Choose for simplified wiring in single-sensor nodes where 1-Wire infrastructure exists and ultra-low accuracy is critical.
ADT7410 (Analog Devices)	I²C interface only; 16-bit resolution; ±0.5°C accuracy (−40°C to +125°C); VDD = 2.7–5.5V (no separate VDDD).	Higher resolution and accuracy, but lacks hardware interface selection and 1.8V logic support; requires I²C bus arbitration.	Choose for high-precision lab equipment where I²C is standard and 1.8V I/O compatibility is not required.

Compared with MAX31820 and ADT7410, DS1722S+T&R uniquely offers hardware-selectable SPI/3-wire operation, true 1.8V digital I/O support, and guaranteed −55°C functionality - making it optimal for mixed-voltage embedded systems needing interface flexibility and wide-range reliability without protocol stack overhead.

Availability

DS1722S+T&R is available at Aetrix Electronics and suitable for server thermal management, industrial PLC temperature sensing, network equipment hot-spot detection, medical diagnostic instrument calibration, and embedded edge-node monitoring requiring stable component supply across long production lifecycles.

Supply support for DS1722S+T&R 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

Analog Devices (acquired Maxim Integrated in 2021) designs high-performance analog, mixed-signal, and digital signal processing ICs for precision measurement, power management, and connectivity applications.

The DS1722S+T&R belongs to Maxim's legacy digital temperature sensor family, engineered for embedded thermal monitoring where minimal external components, dual-supply operation, and hardware-configurable serial interfaces reduce system design complexity.

FAQ

What is the operating temperature range of the DS1722S+T&R?

The DS1722S+T&R operates from −55°C to +120°C, with specified accuracy of ±2.0°C over −40°C to +85°C and ±3.0°C over the full range. This makes DS1722S+T&R suitable for harsh environments including industrial control cabinets and telecom base stations where ambient extremes are common.

Does the DS1722S+T&R require external components for temperature measurement?

No, the DS1722S+T&R contains a factory-calibrated temperature sensor and ADC, requiring no external resistors, capacitors, or reference ICs. DS1722S+T&R delivers true temperature-to-digital conversion out-of-the-box, reducing BOM count and layout complexity in thermal monitoring designs.

How is the serial interface mode selected on the DS1722S+T&R?

The DS1722S+T&R uses the SERMODE pin to select interface mode: connect SERMODE to VDDD for SPI (MSb-first), or to GND for 3-wire (LSb-first with SDI/SDO tied). This hardware-based selection ensures deterministic behavior at power-up and eliminates firmware initialization dependencies for DS1722S+T&R.

What are the supply voltage requirements for DS1722S+T&R?

DS1722S+T&R requires two independent supplies: VDDA (analog, 2.65–5.5V) for the sensor and ADC, and VDDD (digital, 1.8–5.5V) for logic I/O. This separation allows DS1722S+T&R to interface directly with 1.8V microcontrollers while powered from a 3.3V or 5V analog rail - no level shifters needed.

Can the DS1722S+T&R operate in low-power modes?

Yes, DS1722S+T&R features a shutdown mode with typical current draw of 0.5 µA (2.65–3.3V VDDA), entered by setting the SD bit in the configuration register. In this state, DS1722S+T&R retains communication capability via CE/SCLK, enabling wake-on-command for periodic thermal sampling in battery-powered applications.

DS1722S+T&R Specifications

Product attributes: Attribute value

Manufacturer:: Analog Devices Inc./Maxim Integrated

Series:: -

Package/Case:: 8-SOIC (0.154", 3.90mm Width)

Packaging:: Tape & Reel (TR)

Product Status:: Active

Sensor Type:: Digital, Local

Sensing Temperature - Local:: -55°C ~ 120°C

Sensing Temperature - Remote:: -

Output Type:: SPI

Voltage - Supply:: 1.8V ~ 5.5V, 2.65V ~ 5.5V

Resolution:: 11 b

Features:: One-Shot, Programmable Resolution, Shutdown Mode

Accuracy - Highest (Lowest):: ±2°C (±3°C)

Test Condition:: -40°C ~ 85°C (-55°C ~ 120°C)

Operating Temperature:: -55°C ~ 125°C

Mounting Type:: Surface Mount

Grade:: -

Qualification:: -

Supplier Device Package:: 8-SOIC

DS1722S+T&R FAQ

1.How can I place an order for DS1722S+T&R through Aetrix?

Please submit a Request for Quotation (RFQ) for DS1722S+T&R 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 DS1722S+T&R reliable?

The price and inventory of DS1722S+T&R are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for DS1722S+T&R is usually 5 days.

3.What payment methods are accepted for DS1722S+T&R?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for DS1722S+T&R transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for DS1722S+T&R?

DS1722S+T&R orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your DS1722S+T&R 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 DS1722S+T&R?

For technical support, including DS1722S+T&R datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your DS1722S+T&R requirements.

6.How does Aetrix verify that DS1722S+T&R is sourced from the original manufacturer or authorized distributors?

All DS1722S+T&R 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 DS1722S+T&R meets industry standards.

7.What is the process for return or replacement of DS1722S+T&R?

All DS1722S+T&R units undergo pre-shipment inspection (PSI). If there is an issue with DS1722S+T&R, 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 DS1722S+T&R part is unused and in its original packaging.

Return procedure for DS1722S+T&R:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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