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Analog Devices Inc./Maxim Integrated DS1721U+T&R
- Part No.:
- DS1721U+T&R
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Analog and Digital Output
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
DS1721U+T&R.pdf
- Description:
- SENSOR DIGITAL -55C-125C 8UMAX
- Quantity:
- Payment:
- Shipping:
Inventory:4,834
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Product details
Overview
DS1721U+T&R from Maxim Integrated is a 2-wire digital thermometer and thermostat IC with ±1°C accuracy over -10°C to +85°C, 12-bit default resolution (0.0625°C), 750 ms max conversion time, and programmable thermostat output (TOUT) for thermal alarm triggering in microprocessor-based systems.
For engineers reviewing the DS1721U+T&R datasheet, DS1721U+T&R pinout, DS1721U+T&R application, or DS1721U+T&R equivalent, key selection considerations include its 8-pin µSOP package, 2.7V–5.5V supply range, 3-bit I²C addressability for multi-drop bus configuration, and configurable 9–12-bit resolution tradeoff between conversion speed and precision.
Technical Context
The DS1721U+T&R integrates a factory-calibrated on-die temperature sensor, 12-bit successive-approximation ADC, and 2-wire (I²C-compatible) serial interface with open-drain SDA/SCL lines. Its internal thermostat comparator continuously monitors temperature against user-programmable TH/TL registers and drives the TOUT pin with configurable polarity.
Configuration is volatile and stored in an 8-bit register controlling conversion mode (one-shot vs. continuous), resolution bits (R1/R0), TOUT polarity (POL), and DONE status. The device supports both standard (100 kHz) and fast-mode (400 kHz) I²C timing, with all communication MSb-first and two's complement temperature data format.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Temperature Range | -55°C to +125°C operating range; enables use in industrial, automotive under-hood, and computing thermal monitoring. |
| Accuracy | ±1.0°C (typ.) from -10°C to +85°C at 3.0–5.5V; ensures reliable thermal threshold detection without calibration. |
| Resolution | Configurable 9–12 bits (0.5°C to 0.0625°C); allows tradeoff between conversion speed (93.75 ms min) and precision. |
| Supply Voltage | 2.7V to 5.5V; compatible with 3.3V and 5V logic domains without level-shifting. |
| I²C Addressing | 3 hardware address bits (A0–A2); supports up to eight devices on same bus for distributed sensing networks. |
| Thermostat Output | Open-drain TOUT with programmable active-high/active-low polarity and user-defined TH/TL hysteresis. |
| Power Consumption | 0.8 µA standby current; critical for battery-powered or always-on thermal monitoring applications. |
Pinout & Package
DS1721U+T&R is housed in an 8-pin µSOP (micro Small Outline Package) with 0.5 mm pitch, 3.0 mm × 3.0 mm body size, and exposed pad for thermal dissipation - optimized for space-constrained PCB layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1: SDA | 2-wire serial data I/O | Open-drain bidirectional line for I²C data transfer; requires external pull-up resistor. |
| 2: SCL | 2-wire serial clock input | Open-drain clock line synchronized by master; supports 100 kHz / 400 kHz modes. |
| 3: TOUT | Thermostat output signal | Active-low or active-high programmable open-drain alarm output; latched until temperature falls below TL. |
| 4: GND | Ground reference | Primary return path for analog and digital circuitry; must be low-impedance for measurement stability. |
| 5: A2 | Chip address input | Hardware-selectable bit for I²C slave address (1001xxx); enables multi-drop bus topology. |
| 6: A1 | Chip address input | Second address bit; combined with A0/A2 to define unique 7-bit I²C address (0x48–0x4F). |
| 7: A0 | Chip address input | Least-significant address bit; determines device position in up to 8-node thermal sensor network. |
| 8: VDD | Power supply input | Single-supply rail (2.7–5.5V); powers internal sensor, ADC, comparator, and interface logic. |
Key Features
| Feature | Design Value |
|---|---|
| No external components required | Factory-trimmed sensor and ADC eliminate calibration parts, reducing BOM count and layout area. |
| Programmable resolution & conversion mode | 9–12-bit resolution and one-shot/continuous modes enable optimization for speed (93.75 ms) or precision (0.0625°C). |
| Volatile configuration register | Enables runtime reconfiguration of TOUT polarity, hysteresis, and conversion behavior without non-volatile memory overhead. |
| Multi-drop I²C support | Three hardware address pins allow eight DS1721U+T&R units on one bus-ideal for multi-zone thermal monitoring. |
| Thermostat with hysteresis | User-defined TH/TL registers implement latchable thermal alarm with adjustable hysteresis, eliminating need for external comparators. |
Applications
| Server CPU Thermal Monitoring | Laptop Battery Pack Protection |
|---|---|
Use Scenario: Real-time die temperature tracking of multi-core processors during load spikes to prevent thermal throttling or shutdown. IC Role / Device Role / Timing Role: Primary temperature-to-digital converter feeding thermal management firmware; updates every 750 ms (12-bit) or faster upon command. Use Value: ±1°C accuracy ensures precise trip-point enforcement; TOUT directly triggers fan control or system reset without host intervention. | Use Scenario: Monitoring cell temperature across series-connected Li-ion cells to prevent overheat during fast charging or discharge. IC Role / Device Role / Timing Role: Standalone thermostat node interfacing with battery management IC via I²C; operates in low-power standby between conversions. Use Value: 0.8 µA standby current extends battery life; programmable TH/TL enables custom safety thresholds per pack design. |
| Industrial PLC Cabinet Sensing | Network Switch ASIC Thermal Guard |
Use Scenario: Distributed temperature monitoring inside enclosed control cabinets housing programmable logic controllers and I/O modules. IC Role / Device Role / Timing Role: One of eight DS1721U+T&R sensors on shared I²C bus, each assigned unique A0–A2 address for zone-specific readings. Use Value: -55°C to +125°C range covers extreme ambient conditions; µSOP package fits tight spacing near heat-generating relays or power supplies. | Use Scenario: Protecting high-speed Ethernet switch ASICs from thermal runaway during sustained 10G/25G traffic bursts. IC Role / Device Role / Timing Role: Localized sensor mounted adjacent to ASIC die; TOUT asserts immediately after conversion completes and TH is exceeded. Use Value: 93.75 ms 9-bit conversion enables rapid response to sudden thermal events; open-drain TOUT interfaces directly with ASIC thermal shutdown pin. |
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 |
|---|---|---|---|
| MAX31820+ | 1-Wire interface (single data line), 12-bit resolution, ±0.5°C accuracy, no built-in thermostat output. | Requires 1-Wire master; lacks TOUT pin-needs external logic for alarm generation. | Select when board-level wiring simplicity (1-wire vs. 2-wire) outweighs need for integrated thermostat function. |
| LM75BIMM/NOPB | I²C interface, 9-bit resolution (0.5°C), ±2°C accuracy, fixed TH/TL hysteresis, SOIC-8 package. | Lower accuracy and resolution; no programmable TOUT polarity or one-shot mode. | Choose for cost-sensitive, lower-precision thermal monitoring where µSOP footprint is not required. |
Compared with MAX31820+ and LM75BIMM/NOPB, DS1721U+T&R uniquely combines I²C compatibility, programmable hysteresis, TOUT polarity control, and 12-bit resolution in a compact µSOP package-making it optimal for space-constrained, high-accuracy thermal alarm systems requiring minimal external components.
Availability
DS1721U+T&R is available at Aetrix Electronics and suitable for server thermal management, battery protection circuits, industrial PLC cabinets, and network switch ASIC guardbanding requiring stable component supply and long-term lifecycle support.
Supply support for DS1721U+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
Maxim Integrated (now part of Analog Devices) designs precision analog, mixed-signal, and digital ICs for industrial, computing, communications, and consumer applications.
The DS1721U+T&R belongs to Maxim's digital temperature sensor product line, engineered for embedded thermal monitoring where accuracy, low power, and integrated thermostat functionality reduce system complexity.
FAQ
What is the operating temperature range of the DS1721U+T&R?
The DS1721U+T&R operates from -55°C to +125°C, with ±1.0°C accuracy specified from -10°C to +85°C at 3.0–5.5V supply. This full-range capability makes DS1721U+T&R suitable for harsh environments including industrial enclosures, automotive under-hood locations, and high-performance computing thermal zones.
Does the DS1721U+T&R require external components for basic temperature measurement?
No, the DS1721U+T&R requires no external components for core operation: its factory-calibrated temperature sensor and ADC are fully integrated. Only pull-up resistors on SDA and SCL lines are needed for I²C bus operation. No trimming resistors, reference voltages, or external comparators are necessary - DS1721U+T&R functions as a complete "temperature-to-digital" converter.
How does the thermostat output (TOUT) of the DS1721U+T&R behave?
The TOUT pin of DS1721U+T&R is an open-drain output that becomes active when measured temperature exceeds the programmed TH register value, and remains active until temperature falls to or below the TL register value - implementing user-defined hysteresis. Its active state (high or low) is programmable via the POL bit in the configuration register, and DS1721U+T&R powers up with TH=80°C, TL=75°C, and active-high TOUT.
Can multiple DS1721U+T&R devices share the same I²C bus?
Yes, up to eight DS1721U+T&R devices can operate on a single I²C bus using hardware address pins A0, A1, and A2 to set unique 3-bit addresses (1001xxx), resulting in I²C slave addresses 0x48 through 0x4F. This multi-drop capability simplifies distributed thermal sensing in servers, telecom equipment, and industrial control systems without bus arbitration complexity.
What is the conversion time for the DS1721U+T&R at different resolution settings?
DS1721U+T&R conversion time scales with resolution: 93.75 ms (9-bit), 187.5 ms (10-bit), 375 ms (11-bit), and 750 ms (12-bit). The device powers up in 12-bit continuous mode but allows dynamic reconfiguration via the configuration register - enabling DS1721U+T&R to balance speed and precision based on real-time thermal dynamics in applications like fan control or battery safety monitoring.
DS1721U+T&R Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Packaging:
- Tape & Reel (TR)
- 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):
- ±1°C (±2°C)
- Test Condition:
- -10°C ~ 85°C (-55°C ~ 125°C)
- Operating Temperature:
- -55°C ~ 125°C
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
- Supplier Device Package:
- 8-uMAX/uSOP
DS1721U+T&R FAQ
1.How can I place an order for DS1721U+T&R through Aetrix?
Please submit a Request for Quotation (RFQ) for DS1721U+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 DS1721U+T&R reliable?
The price and inventory of DS1721U+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 DS1721U+T&R is usually 5 days.
3.What payment methods are accepted for DS1721U+T&R?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for DS1721U+T&R transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for DS1721U+T&R?
DS1721U+T&R orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your DS1721U+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 DS1721U+T&R?
For technical support, including DS1721U+T&R datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your DS1721U+T&R requirements.
6.How does Aetrix verify that DS1721U+T&R is sourced from the original manufacturer or authorized distributors?
All DS1721U+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 DS1721U+T&R meets industry standards.
7.What is the process for return or replacement of DS1721U+T&R?
All DS1721U+T&R units undergo pre-shipment inspection (PSI). If there is an issue with DS1721U+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 DS1721U+T&R part is unused and in its original packaging.
Return procedure for DS1721U+T&R:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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