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Home > Products > Integrated Circuits (ICs) > Power Management (PMIC) > Thermal Management

Analog Devices Inc./Maxim Integrated DS1629S-C05+T&R

Name: DS1629S-C05+T&R
Brand: Analog Devices Inc./Maxim Integrated
SKU: DS1629S-C05+T&R
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: DS1629S-C05+T&R

Manufacturer:: Analog Devices Inc./Maxim Integrated

Category:: Thermal Management

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

Datasheet:: DS1629S-C05+T&R.pdf

Description:: IC THERM/RTC/CALENDAR DGTL 8SOIC

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Product details

Overview

DS1629S-C05+T&R from Maxim Integrated is a 2-wire digital thermometer and real-time clock (RTC) IC in an 8-pin SO package, measuring temperature from −55°C to +125°C with ±2.0°C typical accuracy and 9-bit resolution, featuring a programmable open-drain ALRM output, 32 bytes of user SRAM, and a 32.768kHz crystal oscillator with buffered OSC output - used in thermal data loggers, battery-powered PDAs, and office equipment for synchronized time/temperature monitoring.

For engineers reviewing the DS1629S-C05+T&R datasheet, DS1629S-C05+T&R pinout, DS1629S-C05+T&R application, or DS1629S-C05+T&R equivalent, key selection considerations include its dual-function integration (RTC + thermometer), 2.2V–5.5V supply range, factory-calibrated sensor requiring no external components, and configurable alarm modes (thermal-only, time-only, or combined) via I²C-compatible 2-wire interface.

Technical Context

The DS1629S-C05+T&R integrates a bandgap-based delta-sigma ADC for direct temperature-to-digital conversion and a BCD-coded RTC with leap-year compensation through 2100, driven by an external 32.768kHz crystal connected between X1 and X2 pins. Its oscillator divider supports four programmable OSC output frequencies (fO, fO/4, fO/8, or disabled) via OS0/OS1 bits in the configuration register.

Alarm logic uses two independent comparators: one compares measured temperature against nonvolatile TH/TL registers (with hysteresis support), the other matches current time against the clock alarm register; both feed into a logical OR for the open-drain ALRM output, whose polarity (active-high/low) is set by the POL bit. Configuration, status, and memory access occur over a 400kHz-max 2-wire bus using fixed slave address 0x90/0x91.

Key Specifications

Parameter	Value and Actual Design Meaning
Temperature Range	−55°C to +125°C - supports industrial and automotive ambient monitoring without external conditioning.
Thermometer Accuracy	±2.0°C (typ) - enables reliable thermal threshold detection in consumer electronics and embedded systems.
Resolution	9-bit (0.5°C LSB) - provides sufficient granularity for HVAC control and battery thermal management.
RTC Format	BCD-coded seconds/minutes/hours/day/date/month/year - simplifies firmware parsing and eliminates binary-to-BCD conversion overhead.
Supply Voltage	2.2V to 5.5V - allows direct operation from single Li-ion, 3.3V, or 5V rails without LDO.
Interface	2-wire (I²C-compatible) at ≤400kHz - ensures interoperability with standard microcontroller peripherals and reduces PCB routing complexity.
User Memory	32 bytes SRAM - stores calibration offsets, event timestamps, or thermal history without external EEPROM.

Pinout & Package

DS1629S-C05+T&R is housed in an 8-pin SOIC package (150-mil width), RoHS-compliant and tape-and-reel packaged (2500 pcs/reel). Pin functions are validated per Maxim's official DS1629 datasheet Rev 11/13.

Pin/Terminal	Circuit Role	Design Meaning
1: SDA	2-wire serial data I/O	Open-drain bidirectional line for command/data transfer; requires external pull-up for bus operation.
2: SCL	2-wire serial clock input	Master-generated clock up to 400kHz; synchronizes all read/write transactions.
3: ALRM	Configurable alarm output	Open-drain output active on thermal exceedance, time match, or both; polarity programmable via POL bit.
4: GND	Ground reference	Primary return path for analog/digital circuitry; must be low-impedance for accurate temperature sensing.
5: X2	Clock crystal feedback	Connects to 32.768kHz crystal output terminal; completes Pierce oscillator loop with internal inverter.
6: X1	Clock crystal input	Connects to 32.768kHz crystal input terminal; forms resonant tank with X2 for stable RTC timing.
7: OSC	Buffered oscillator output	Open-drain output providing divided crystal frequency (fO, fO/4, fO/8, or disabled) for MCU clocking.
8: VDD	Power supply input	Accepts 2.2V–5.5V; powers RTC, thermometer, SRAM, and interface; EEPROM writes require ≥2.7V.

Key Features

Feature	Design Value
Integrated RTC + Thermometer	Single-chip solution eliminates separate timekeeping and temperature ICs, reducing BOM count and board area in space-constrained designs.
Programmable Alarm Logic	Four selectable modes (disabled, thermal-only, time-only, or combined) enable flexible system-level event response without host CPU polling.
Factory-Calibrated Sensor	Bandgap-based delta-sigma ADC requires no external components or calibration routines - delivers ready-to-use temperature data after power-up.
Configurable OSC Output	Four division ratios (fO, fO/4, fO/8, off) allow precise clock sourcing for MCUs while minimizing power when unused.
Nonvolatile TH/TL Registers	EEPROM-based high/low trip points (2K write cycles) retain alarm thresholds across power cycles for unattended thermal monitoring.

Applications

Thermal Data Logger	Portable Medical Device
Use Scenario: Continuous recording of ambient temperature in cold-chain logistics shipments over multi-day transit. IC Role / Device Role / Timing Role: DS1629S-C05+T&R acts as autonomous temperature/time stamping engine, logging readings to its 32-byte SRAM and triggering ALRM if thresholds are breached. Use Value: Eliminates need for external microcontroller intervention during logging; RTC ensures accurate timestamp alignment across thousands of samples.	Use Scenario: Real-time core body temperature tracking and elapsed usage timer in handheld diagnostic tools. IC Role / Device Role / Timing Role: DS1629S-C05+T&R serves as dual-role sensor/clock, delivering calibrated temperature data and maintaining session duration with leap-year-corrected calendar. Use Value: Enables FDA-compliant audit trails via synchronized time-stamped measurements, all within ultra-low-power 2.2V–5.5V operation.
Industrial Control Panel	Smart Office Equipment
Use Scenario: Overtemperature shutdown and maintenance scheduling in HVAC control panels operating in harsh environments. IC Role / Device Role / Timing Role: DS1629S-C05+T&R monitors enclosure temperature and triggers ALRM on exceedance while maintaining accurate service interval countdowns. Use Value: Prevents thermal damage via hardware-level alarm assertion, independent of host processor status or firmware state.	Use Scenario: Power-aware thermal management and automatic sleep/wake scheduling in multifunction printers and copiers. IC Role / Device Role / Timing Role: DS1629S-C05+T&R tracks internal component temperature and schedules fan activation or deep-sleep transitions using its RTC alarm. Use Value: Extends device lifespan by correlating thermal stress with operational time, enabling predictive cooling without added MCU load.

Thermal Data Logger

Portable Medical Device

Use Scenario: Continuous recording of ambient temperature in cold-chain logistics shipments over multi-day transit.

IC Role / Device Role / Timing Role: DS1629S-C05+T&R acts as autonomous temperature/time stamping engine, logging readings to its 32-byte SRAM and triggering ALRM if thresholds are breached.

Use Value: Eliminates need for external microcontroller intervention during logging; RTC ensures accurate timestamp alignment across thousands of samples.

Use Scenario: Real-time core body temperature tracking and elapsed usage timer in handheld diagnostic tools.

IC Role / Device Role / Timing Role: DS1629S-C05+T&R serves as dual-role sensor/clock, delivering calibrated temperature data and maintaining session duration with leap-year-corrected calendar.

Use Value: Enables FDA-compliant audit trails via synchronized time-stamped measurements, all within ultra-low-power 2.2V–5.5V operation.

Industrial Control Panel

Smart Office Equipment

Use Scenario: Overtemperature shutdown and maintenance scheduling in HVAC control panels operating in harsh environments.

IC Role / Device Role / Timing Role: DS1629S-C05+T&R monitors enclosure temperature and triggers ALRM on exceedance while maintaining accurate service interval countdowns.

Use Value: Prevents thermal damage via hardware-level alarm assertion, independent of host processor status or firmware state.

Use Scenario: Power-aware thermal management and automatic sleep/wake scheduling in multifunction printers and copiers.

IC Role / Device Role / Timing Role: DS1629S-C05+T&R tracks internal component temperature and schedules fan activation or deep-sleep transitions using its RTC alarm.

Use Value: Extends device lifespan by correlating thermal stress with operational time, enabling predictive cooling without added MCU load.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
DS3231M+	Higher RTC accuracy (±2ppm vs ±20ppm), integrated TCXO, no integrated thermometer; 16-pin TSSOP.	Best for precision timekeeping where temperature sensing is handled separately.	Select DS3231M+ only if sub-second RTC drift is critical and external temperature sensing is acceptable.
MAX31875	Dedicated ±0.25°C accuracy digital thermometer (no RTC); 8-pin SO, 1.7V–3.6V supply; I²C interface.	Suitable when high-accuracy temperature monitoring is required but real-time clock functionality is unnecessary.	Choose MAX31875 when thermal precision outweighs timekeeping needs and supply voltage is limited to ≤3.6V.

Compared with DS1629S-C05+T&R, DS3231M+ offers superior timekeeping stability but lacks on-chip temperature sensing, while MAX31875 delivers higher thermal accuracy but omits RTC - making DS1629S-C05+T&R uniquely balanced for cost-sensitive, space-constrained dual-function applications requiring moderate accuracy in both domains.

Availability

DS1629S-C05+T&R is available at Aetrix Electronics and suitable for thermal data loggers, portable medical devices, industrial control panels, and smart office equipment requiring stable component supply, long-lifecycle support, and RoHS-compliant packaging.

Supply support for DS1629S-C05+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, communications, computing, and consumer applications.

The DS1629S-C05+T&R belongs to Maxim's legacy digital thermometer and RTC product line, engineered for embedded systems needing tightly integrated, low-power time and temperature measurement without external calibration or support components.

FAQ

What is the operating temperature range of the DS1629S-C05+T&R?

The DS1629S-C05+T&R operates across −55°C to +125°C, with guaranteed functionality and ±2.0°C typical accuracy throughout this range. This makes DS1629S-C05+T&R suitable for deployment in extreme environments such as automotive under-hood modules, industrial motor controls, and outdoor data acquisition units where wide thermal margins are essential.

Does the DS1629S-C05+T&R require external components to function as a thermometer?

No, the DS1629S-C05+T&R contains a factory-calibrated bandgap-based temperature sensor and delta-sigma ADC, requiring no external resistors, capacitors, or trimming circuits. The DS1629S-C05+T&R delivers ready-to-read 9-bit temperature values over its 2-wire interface immediately after power-up in continuous mode, simplifying design and reducing bill-of-materials cost.

How does the alarm output (ALRM) of the DS1629S-C05+T&R behave under different configurations?

The ALRM pin of the DS1629S-C05+T&R is open-drain and configurable via the A0/A1 bits in the configuration register to activate on thermal exceedance only, time match only, either condition, or remain disabled. Its polarity (active-high/low) is set by the POL bit. When both alarms are enabled, ALRM asserts if either condition occurs and clears only when both are resolved - ensuring robust fault signaling in safety-critical systems using DS1629S-C05+T&R.

Can the DS1629S-C05+T&R operate from a 3.3V supply, and what functions are supported at that voltage?

Yes, the DS1629S-C05+T&R fully supports 3.3V operation across all core functions: RTC counting, temperature conversion, 2-wire communication, SRAM access, and ALRM assertion. However, EEPROM writes to TH/TL registers and reliable temperature conversions require VDD ≥2.7V - so at exactly 3.3V, DS1629S-C05+T&R maintains full functionality including alarm programming and high-resolution thermometry.

What is the role of the OSC pin on the DS1629S-C05+T&R, and how is its frequency configured?

The OSC pin on the DS1629S-C05+T&R provides a buffered, open-drain output of the internal crystal oscillator, configurable via OS0/OS1 bits to deliver fO, fO/4, fO/8, or disabled. This allows DS1629S-C05+T&R to serve as a system clock source for microcontrollers - eliminating the need for a separate crystal oscillator IC while enabling power savings when the output is disabled during idle periods.

DS1629S-C05+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:: Obsolete

Function:: Thermometer, Thermostat

Sensor Type:: Internal

Sensing Temperature:: -55°C ~ 125°C

Accuracy:: ±2°C(Max)

Topology:: ADC, Comparator, Oscillator, Register Bank

Output Type:: I2C/SMBus

Output Alarm:: Yes

Output Fan:: No

Voltage - Supply:: 2.7V ~ 5.5V

Operating Temperature:: -55°C ~ 125°C

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 8-SOIC

DS1629S-C05+T&R FAQ

1.How can I place an order for DS1629S-C05+T&R through Aetrix?

Please submit a Request for Quotation (RFQ) for DS1629S-C05+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 DS1629S-C05+T&R reliable?

The price and inventory of DS1629S-C05+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 DS1629S-C05+T&R is usually 5 days.

3.What payment methods are accepted for DS1629S-C05+T&R?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for DS1629S-C05+T&R transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for DS1629S-C05+T&R?

DS1629S-C05+T&R orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your DS1629S-C05+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 DS1629S-C05+T&R?

For technical support, including DS1629S-C05+T&R datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your DS1629S-C05+T&R requirements.

6.How does Aetrix verify that DS1629S-C05+T&R is sourced from the original manufacturer or authorized distributors?

All DS1629S-C05+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 DS1629S-C05+T&R meets industry standards.

7.What is the process for return or replacement of DS1629S-C05+T&R?

All DS1629S-C05+T&R units undergo pre-shipment inspection (PSI). If there is an issue with DS1629S-C05+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 DS1629S-C05+T&R part is unused and in its original packaging.

Return procedure for DS1629S-C05+T&R:

1.Submit a request within 90 days.

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

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