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Analog Devices Inc./Maxim Integrated DS1629S/T&R
- Part No.:
- DS1629S/T&R
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Thermal Management
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
DS1629S/T&R.pdf
- Description:
- IC THERM/RTC/CALENDAR DIG 8-SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,651
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Product details
Overview
DS1629S/T&R from Maxim Integrated (now Analog Devices) is a 2-wire digital thermometer and real-time clock IC in an 8-pin SOIC 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 RTC with leap-year compensation through 2100 - used in thermal data loggers, cellular telephones, and office equipment.
For engineers reviewing the DS1629S/T&R datasheet, DS1629S/T&R pinout, DS1629S/T&R application, or DS1629S/T&R equivalent, key selection criteria include its dual-function integration (temperature sensing + RTC), 2.2V–5.5V supply range, 32.768kHz crystal interface, 400kHz I²C-compatible bus support, and factory-calibrated bandgap sensor requiring no external components.
Technical Context
The DS1629S/T&R integrates a delta-sigma ADC-based temperature sensor and a BCD-format RTC with automatic month-end and leap-year correction through year 2100. Its oscillator divider supports configurable OSC output frequencies (fO, fO/4, fO/8, or disabled) via nonvolatile OS0/OS1 bits.
Alarm logic combines independent thermal and time comparators feeding a single open-drain ALRM output, configurable for active-high or active-low polarity (POL bit) and four alarm modes (disabled, temp-only, time-only, or either) via A0/A1 bits. Temperature conversions operate in continuous or one-shot mode controlled by CNV and 1SH bits.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Temperature Range | −55°C to +125°C; supports industrial and extended-temperature embedded systems without external conditioning. |
| Thermometer Accuracy | ±2.0°C (typ); enables reliable thermal monitoring in battery-powered PCs, PDAs, and cellular handsets. |
| RTC Resolution | Seconds-to-year BCD calendar with automatic leap-year compensation through 2100; eliminates firmware date-handling overhead. |
| I²C Bus Speed | Up to 400kHz; compatible with standard-mode and fast-mode microcontrollers without timing constraints. |
| Supply Voltage | 2.2V to 5.5V; allows direct operation from single Li-ion, 3.3V, or 5V rails without LDO regulation. |
| User Memory | 32 bytes of SRAM; provides non-critical storage for calibration offsets, event logs, or configuration flags without external EEPROM. |
| Crystal Frequency | 32.768kHz; standard low-power watch crystal enabling precise timekeeping with minimal board footprint. |
Pinout & Package
DS1629S/T&R is housed in an 8-pin SOIC package (150-mil width), with pins arranged as follows:
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 SDA | 2-wire serial data I/O | Open-drain bidirectional line for I²C communication; requires external pull-up resistor. |
| 2 SCL | 2-wire serial clock input | Master-generated clock signal; synchronizes all register reads/writes and command execution. |
| 3 ALRM | Programmable alarm output | Open-drain output asserting on thermal or time events; polarity and trigger mode configurable via registers. |
| 4 GND | Ground reference | Primary return path for analog and digital circuitry; must be low-impedance for stable RTC and temperature readings. |
| 5 X2 | Crystal feedback output | Drives crystal's feedback terminal; completes Pierce oscillator loop with internal inverter and X1 input. |
| 6 X1 | Crystal input | Connects to crystal's input terminal; forms resonant tank with X2 and internal oscillator circuitry. |
| 7 OSC | Buffered oscillator output | Open-drain divided clock output (configurable frequency); usable as system clock source for microcontrollers. |
| 8 VDD | Power supply input | Accepts 2.2V–5.5V; powers all internal blocks including ADC, RTC, SRAM, and I²C interface. |
Key Features
| Feature | Design Value |
|---|---|
| Dual-function integration | Single-chip replacement for discrete RTC + temperature sensor, reducing BOM count and PCB area in space-constrained designs. |
| Factory-calibrated sensor | Bandgap-based temperature measurement requiring zero external components; eliminates calibration effort during production. |
| Configurable alarm logic | Four independent alarm modes (temp-only, time-only, OR-combined, disabled) with hysteresis control via TH/TL registers. |
| Low-voltage operation | Full functionality down to 2.2V enables direct use in coin-cell or single-cell Li-ion applications without voltage boosting. |
| Nonvolatile configuration | OS0/OS1, POL, A0/A1, CNV, and 1SH bits retain settings across power cycles, ensuring consistent startup behavior. |
Applications
| Thermal Data Logging | Mobile Device Thermal Management |
|---|---|
Use Scenario: Continuous ambient temperature recording in environmental monitoring units with timestamped entries. IC Role / Device Role / Timing Role: Primary temperature-to-digital converter and time-stamping engine; RTC supplies accurate timestamps while thermometer captures readings. Use Value: Eliminates need for separate RTC and sensor ICs, reducing component count and enabling compact, battery-operated loggers with >1-year runtime. | Use Scenario: Real-time junction temperature tracking and overheat alerting in smartphones and tablets during CPU/GPU load spikes. IC Role / Device Role / Timing Role: Local thermal monitor with programmable TH/TL thresholds; ALRM pin triggers immediate system throttling or shutdown. Use Value: Prevents thermal runaway using hardware-level alarm assertion - faster and more reliable than software polling. |
| PC Power Supply Monitoring | Office Equipment Clocking |
Use Scenario: Monitoring heatsink temperature near VRMs and triggering fan speed adjustments based on thermal thresholds. IC Role / Device Role / Timing Role: Standalone thermal watchdog interfaced to PMBus or SMBus host; ALRM signals critical overtemperature events. Use Value: Provides fail-safe thermal protection independent of main CPU, improving system reliability under firmware failure conditions. | Use Scenario: Maintaining accurate wall-clock time and date in multifunction printers, scanners, and copiers during AC power interruptions. IC Role / Device Role / Timing Role: Primary RTC with battery-backed operation; uses internal oscillator and external 32.768kHz crystal for long-term accuracy. Use Value: Ensures correct timestamping of documents and scheduled tasks even after extended power loss, with no firmware date reset required. |
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. DS1629S/T&R's ~200ppm), integrated TCXO, but no integrated temperature sensor - requires external thermistor or sensor. | Preferred where timekeeping precision dominates thermal monitoring; unsuitable when combined sensing+timing in one chip is mandatory. | Select DS3231M+ only if sub-second annual drift matters more than integrated temperature measurement. |
| MAX31875 | Dedicated high-accuracy digital thermometer (±0.25°C) with I²C interface, but no RTC or calendar functions - lacks time-stamping capability entirely. | Used when precise temperature logging is needed without time-of-day context; cannot replace DS1629S/T&R in timestamped logging or alarm-triggered time events. | Choose MAX31875 only for pure thermal sensing applications where RTC functionality is handled separately. |
Compared with DS3231M+ and MAX31875, the DS1629S/T&R uniquely delivers co-located, factory-calibrated temperature sensing and full BCD RTC in one SOIC-8 package - making it the only option when board space, component count, and hardware-level thermal+time alarm coordination are design priorities.
Availability
DS1629S/T&R is available at Aetrix Electronics and suitable for thermal data loggers, mobile device thermal management, and PC power supply monitoring requiring stable component supply, RoHS-compliant packaging, and tape-and-reel delivery for automated assembly.
Supply support for DS1629S/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 (via acquisition of Maxim Integrated) designs precision analog, mixed-signal, and digital ICs for industrial, automotive, and computing applications.
The DS1629S/T&R belongs to Maxim's legacy temperature and timing product line, engineered specifically for embedded systems needing tightly coupled, low-power temperature sensing and real-time clocking in minimal footprint.
FAQ
What is the operating temperature range of the DS1629S/T&R?
The DS1629S/T&R operates across −55°C to +125°C, with typical thermometer accuracy of ±2.0°C over this full range. This specification is verified per the device's factory calibration and applies directly to the DS1629S/T&R in its 8-pin SOIC package without derating or external compensation. The wide range supports deployment in harsh environments such as industrial controllers and automotive infotainment housings.
Does the DS1629S/T&R require external components to function as a thermometer?
No, the DS1629S/T&R does not require external components to perform temperature measurements. Its bandgap-based sensor and delta-sigma ADC are fully integrated and factory-calibrated; only a 32.768kHz crystal (for RTC) and pull-up resistors on SDA/SCL are needed for basic operation. The DS1629S/T&R achieves true "temperature-to-digital" conversion without thermistors, op-amps, or reference voltages.
How is the alarm output of the DS1629S/T&R configured for thermal events?
The DS1629S/T&R alarm output is configured for thermal events using nonvolatile TH and TL registers accessed via commands A1h and A2h. When temperature ≥ TH, the TAF flag sets and ALRM asserts; it remains active until temperature ≤ TL, enabling programmable hysteresis. Configuration is retained across power cycles, and polarity (active-high/low) is set via the POL bit in the configuration register (ACh).
Can the DS1629S/T&R operate from a 2.5V supply?
Yes, the DS1629S/T&R supports a supply voltage range of 2.2V to 5.5V, so 2.5V is fully within specification. At 2.5V, all core functions - temperature conversion, RTC operation, SRAM access, and I²C communication - remain fully functional. However, EEPROM writes (TH/TL registers) and temperature conversions are guaranteed only at 2.7V–5.5V per the datasheet, so those operations should be avoided below 2.7V.
What is the maximum I²C clock frequency supported by the DS1629S/T&R?
The DS1629S/T&R supports a maximum I²C clock frequency of 400kHz, compliant with Fast-mode I²C specifications. This allows high-speed register access and command execution without timing bottlenecks in microcontroller-based systems. The device responds to standard 7-bit slave address 1001111b (0x9F for write, 0x9E for read), with no address pins - limiting bus placement to a single DS1629S/T&R per I²C segment.
DS1629S/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/T&R FAQ
1.How can I place an order for DS1629S/T&R through Aetrix?
Please submit a Request for Quotation (RFQ) for DS1629S/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/T&R reliable?
The price and inventory of DS1629S/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/T&R is usually 5 days.
3.What payment methods are accepted for DS1629S/T&R?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for DS1629S/T&R transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for DS1629S/T&R?
DS1629S/T&R orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your DS1629S/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/T&R?
For technical support, including DS1629S/T&R datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your DS1629S/T&R requirements.
6.How does Aetrix verify that DS1629S/T&R is sourced from the original manufacturer or authorized distributors?
All DS1629S/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/T&R meets industry standards.
7.What is the process for return or replacement of DS1629S/T&R?
All DS1629S/T&R units undergo pre-shipment inspection (PSI). If there is an issue with DS1629S/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/T&R part is unused and in its original packaging.
Return procedure for DS1629S/T&R:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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