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Analog Devices Inc./Maxim Integrated DS1629S-C05+
- Part No.:
- DS1629S-C05+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Thermal Management
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
DS1629S-C05+.pdf
- Description:
- IC THERM/RTC/CALENDAR DGTL 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,424
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Product details
Overview
DS1629S-C05+ from Maxim Integrated (now Analog Devices) is a 2-wire digital thermometer and real-time clock IC integrating temperature sensing (−55°C to +125°C), RTC with leap-year compensation through 2100, and 32 bytes of SRAM in an 8-pin SOIC package. It delivers ±2.0°C typical accuracy, 9-bit resolution, and supports battery-powered thermal monitoring in PCs, data loggers, and cellular handsets.
For engineers reviewing the DS1629S-C05+ datasheet, DS1629S-C05+ pinout, DS1629S-C05+ application, or DS1629S-C05+ equivalent, key selection considerations include its dual-function integration, open-drain ALRM output with configurable thermal/time alarm logic, 2.2V–5.5V supply range, 2-wire interface compatibility, and factory-calibrated temperature sensor requiring no external components.
Technical Context
The DS1629S-C05+ implements a delta-sigma ADC-based bandgap temperature sensor delivering 9-bit two's complement output at 0.5°C LSB, with optional high-resolution calculation using COUNT_REMAIN and COUNT_PER_C registers. Its RTC uses an internal oscillator divider driven by an external 32.768kHz crystal, supporting 12-/24-hour format and automatic month-end/leap-year adjustment through year 2100.
Alarm functionality is implemented via independent thermal and clock comparators feeding into a programmable OR logic block driving the open-drain ALRM pin; hysteresis is supported via separate TH/TL EEPROM registers. Configuration is managed through a nonvolatile 8-bit register controlling conversion mode (one-shot/continuous), ALRM polarity, alarm enable state (thermal-only/time-only/both/disabled), and OSC output division (fO, fO/4, fO/8, disabled).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Temp Range | −55°C to +125°C: Full industrial-grade operating range without external calibration or compensation circuitry. |
| Temp Accuracy | ±2.0°C (typ): Factory-trimmed offset and gain ensure reliable thermal thresholding without system-level correction. |
| Temp Resolution | 9-bit (0.5°C LSB): Native digital output format enables direct microcontroller interpretation without scaling. |
| RTC Precision | Leap-year compensated through 2100: Fully autonomous calendar arithmetic eliminates host firmware date-handling overhead. |
| Interface | 2-wire (I²C-compatible): Open-drain SDA/SCL support standard microcontroller GPIO with pull-ups; max 400kHz clock rate. |
| Supply Range | 2.2V to 5.5V: Enables direct connection to Li-ion battery rails (3.0–4.2V) or 3.3V/5V system supplies without regulation. |
| SRAM | 32 bytes: Non-volatile storage not required-used for runtime logging, configuration flags, or transient thermal history buffers. |
Pinout & Package
DS1629S-C05+ is housed in an 8-pin SOIC package (150-mil width), RoHS-compliant and lead-free per + suffix. Pin layout follows standard SO-8 footprint with GND on pin 4 and VDD on pin 8.
| 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 arbitration. |
| 2 (SCL) | 2-wire serial clock input | Master-generated clock synchronizing all read/write operations; tolerant of 400kHz max frequency. |
| 3 (ALRM) | Configurable alarm output | Open-drain output asserting active-low (default) or active-high based on POL bit; drives external interrupt or latch. |
| 4 (GND) | Ground reference | Primary return path for analog/digital circuits; must be low-impedance to minimize noise coupling into temp/RTC paths. |
| 5 (X2) | Crystal feedback output | Connects to X2 terminal of 32.768kHz tuning-fork crystal; completes Pierce oscillator loop with internal inverter. |
| 6 (X1) | Crystal input | Drives crystal's X1 terminal; internal load capacitance optimized for standard 12.5pF crystals. |
| 7 (OSC) | Oscillator buffered output | Open-drain divided clock output (configurable as fO, fO/4, fO/8, or disabled); usable as MCU clock source. |
| 8 (VDD) | Power supply input | Accepts 2.2–5.5V; powers all internal blocks including EEPROM writes (requires ≥2.7V for reliable write cycles). |
Key Features
| Feature | Design Value |
|---|---|
| Dual-function integration | Single-chip replacement for discrete RTC + temperature sensor, reducing BOM count, PCB area, and qualification effort. |
| Programmable alarm logic | Four selectable modes (thermal-only/time-only/both/disabled) via A0/A1 bits-enables flexible system-level event response without firmware polling. |
| Factory-calibrated sensor | No external components needed for ±2°C accuracy across full −55°C to +125°C range-eliminates trimming resistors or lookup tables. |
| Nonvolatile thermostat registers | TH/TL stored in EEPROM (2k-cycle endurance) retain trip points across power cycles-supports persistent thermal safety thresholds. |
| Configurable oscillator output | OSC pin provides buffered, user-selectable clock division (fO, fO/4, fO/8) or disable-reduces need for external clock buffer or divider IC. |
Applications
| PC Thermal Monitoring | Data Logger Timestamping |
|---|---|
Use Scenario: Real-time CPU/die temperature tracking in desktop/laptop motherboards with dynamic fan control and thermal throttling. IC Role / Device Role / Timing Role: Primary temperature-to-digital converter and secondary RTC for timestamping thermal events and system uptime logs. Use Value: Eliminates need for separate MAX6657 + DS1307 solution; ±2°C accuracy ensures reliable trip-point enforcement at 95°C+ junction temperatures. | Use Scenario: Battery-powered environmental logger recording temperature and time stamps at 10-minute intervals over 30 days. IC Role / Device Role / Timing Role: Integrated RTC maintains accurate calendar time while thermometer captures ambient readings; SRAM stores last 32 samples locally. Use Value: 2.2V operation extends battery life; leap-year compensation prevents date rollover errors in long-term deployments. |
| Cellular Handset Safety | Office Equipment Calibration |
Use Scenario: Overtemperature shutdown during fast charging or sustained RF transmission in smartphones and tablets. IC Role / Device Role / Timing Role: Standalone thermal watchdog with hysteresis (TH/TL) and ALRM-driven interrupt to baseband processor. Use Value: Active-low ALRM directly triggers PMIC shutdown sequence; factory calibration avoids field recalibration labor. | Use Scenario: Automatic time/date stamping and ambient temperature logging in multifunction printers and copiers for service diagnostics. IC Role / Device Role / Timing Role: Embedded RTC provides accurate job timestamps; thermometer monitors internal thermal stress near fuser assembly. Use Value: 32-byte SRAM stores error codes with time/temperature context; 12/24-hour format supports global regional settings. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar digital thermometer + RTC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| DS3231SN#T&R | Higher RTC accuracy (±2ppm vs. ±20ppm), integrated TCXO, but no temperature sensor; 32KB EEPROM instead of 32B SRAM. | Requires external temperature sensor (e.g., DS18B20) for thermal functions; better suited for precision timing-only systems. | Select DS3231SN#T&R only if RTC accuracy dominates requirements and thermal sensing is handled separately. |
| MAX31875RAA+ | High-accuracy ±0.25°C temperature sensor with I²C interface, but no RTC or alarm outputs; 1.7V–3.6V supply only. | Lacks calendar, alarms, and SRAM-pure thermometer function; incompatible with time-stamped thermal logging. | Choose MAX31875RAA+ when ultra-precise single-point temperature measurement is critical and RTC is provided elsewhere. |
Compared with DS3231SN#T&R and MAX31875RAA+, the DS1629S-C05+ uniquely combines calibrated temperature sensing, leap-year RTC, programmable alarms, and local SRAM in one SOIC-8 device-making it optimal for space-constrained, thermally aware embedded systems needing both time and temperature awareness without external components.
Availability
DS1629S-C05+ is available at Aetrix Electronics and suitable for PC thermal management, portable data loggers, cellular handset safety systems, and office equipment diagnostics requiring stable component supply and long-lifecycle support.
Supply support for DS1629S-C05+ 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 ICs for precision sensing, power management, and timing applications.
The DS1629S-C05+ belongs to Maxim's legacy digital thermometer + RTC product line, engineered for embedded systems requiring simultaneous, low-power thermal and time awareness in minimal footprint.
FAQ
What is the temperature accuracy specification for DS1629S-C05+ across its full operating range?
The DS1629S-C05+ has a typical temperature accuracy of ±2.0°C over its full operating range of −55°C to +125°C. This specification is factory-calibrated and does not require external compensation. Accuracy is measured at steady-state conditions with proper thermal mounting; self-heating effects are minimized by the device's low quiescent current (1μA in standby). The DS1629S-C05+ datasheet confirms this value applies across the entire range without derating.
Does DS1629S-C05+ support both 12-hour and 24-hour clock formats, and how is the format selected?
Yes, DS1629S-C05+ supports both 12-hour and 24-hour clock formats. The format is selected via the 12/24 bit (bit 5 of clock register byte 02h): when set to 1, the device operates in 12-hour mode with AM/PM indicator; when cleared to 0, it uses 24-hour mode. The DS1629S-C05+ powers up in 12-hour mode by default. Format changes are made by writing to the clock register using the Access Clock (C0h) command with the R/W bit set to 0.
Can DS1629S-C05+ operate from a single-cell lithium battery, and what is the minimum supply voltage for full functionality?
Yes, DS1629S-C05+ supports single-cell lithium battery operation with a wide supply range of 2.2V to 5.5V. For full functionality-including RTC operation, SRAM data retention, and 2-wire communication-the device operates down to 2.2V. However, temperature conversions and EEPROM writes (e.g., TH/TL programming) require ≥2.7V to ensure reliability, as specified in the DS1629S-C05+ datasheet.
How is the ALRM output configured for thermal-only alarm triggering on DS1629S-C05+?
The ALRM output on DS1629S-C05+ is configured for thermal-only alarm triggering by setting bits A1/A0 in the configuration register to '01' (binary). This is done via the Access Config (ACh) command. When enabled, ALRM asserts when the measured temperature meets or exceeds the TH register value and remains active until temperature falls to or below the TL register value-providing built-in hysteresis. The polarity (active-low/high) is controlled independently by the POL bit.
Is an external crystal required for DS1629S-C05+ RTC operation, and what type is specified?
Yes, DS1629S-C05+ requires an external 32.768kHz tuning-fork crystal connected between X1 and X2 pins for RTC operation. The device is designed for standard load capacitance crystals (typically 12.5pF), and the internal oscillator circuit provides appropriate biasing and feedback. No external capacitors are required-crystal selection must match the DS1629S-C05+'s drive level and ESR specifications per the datasheet to ensure stable oscillation and calendar accuracy.
DS1629S-C05+ 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:
- 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+ FAQ
1.How can I place an order for DS1629S-C05+ through Aetrix?
Please submit a Request for Quotation (RFQ) for DS1629S-C05+ 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+ reliable?
The price and inventory of DS1629S-C05+ 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+ is usually 5 days.
3.What payment methods are accepted for DS1629S-C05+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for DS1629S-C05+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for DS1629S-C05+?
DS1629S-C05+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your DS1629S-C05+ 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+?
For technical support, including DS1629S-C05+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your DS1629S-C05+ requirements.
6.How does Aetrix verify that DS1629S-C05+ is sourced from the original manufacturer or authorized distributors?
All DS1629S-C05+ 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+ meets industry standards.
7.What is the process for return or replacement of DS1629S-C05+?
All DS1629S-C05+ units undergo pre-shipment inspection (PSI). If there is an issue with DS1629S-C05+, 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+ part is unused and in its original packaging.
Return procedure for DS1629S-C05+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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