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NXP Semiconductors PCA1626U/F2,026
- Part No.:
- PCA1626U/F2,026
- Manufacturer:
- NXP Semiconductors
- Package:
- -
- Datasheet:
-
PCA1626U/F2,026.pdf
- Description:
- IC WATCH CIRCUIT 32KHZ DIE
- Quantity:
- Payment:
- Shipping:
Inventory:15,600
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Product details
Overview
PCA1626U/F2,026 from Philips Semiconductors is a CMOS 32 kHz watch circuit with integrated EEPROM, designed for quartz-crystal-controlled wristwatches using bipolar stepping motors. It delivers 20 s motor cycle time, 5.8 ms pulse width, 100% drive capability, battery end-of-life detection, and ultra-low 170 nA typical supply current.
For engineers reviewing the PCA1626U/F2,026 datasheet, PCA1626U/F2,026 pinout, PCA1626U/F2,026 application, or PCA1626U/F2,026 equivalent, key selection criteria include motor timing precision, lithium/silver-oxide battery voltage detection thresholds (VLIT = 1.65–1.95 V, VEOL = 1.27–1.46 V), EEPROM-based time calibration reprogrammability (up to 100 cycles), and chip-in-tray delivery format compatibility with hybrid watch module assembly.
Technical Context
The PCA1626U/F2,026 integrates a 32.768 kHz crystal oscillator with amplitude regulation and ±0.05×10⁻⁶ frequency stability under ±100 mV supply variation. Its oscillator uses non-symmetrical internal input/output capacitances (10 pF / 15 pF) to induce positive-only frequency deviation for precise EEPROM-based calibration.
It implements dual-mode motor control: lithium mode (75% duty factor) when VDD ≥ VLIT, and silver-oxide mode when VLIT > VDD > VEOL; battery end-of-life triggers unchopped pulses with 4-pulse bursts every 4 seconds. Voltage detection occurs every 60 s, and power-on reset requires VDD rise time < 0.1 ms from 0 V to 2.1 V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Motor cycle time | 20 s - defines interval between successive motor pulses in normal operation |
| Pulse width | 5.8 ms - duration of each motor drive pulse, enabling reliable stepping motor actuation | Drive capability | 100% - full-duty motor output without chopping, supporting high-torque mechanical movement |
| Supply current (typ.) | 170 nA - enables multi-year battery life in 1.5 V silver-oxide or lithium watch cells |
| Frequency stability | ±0.05×10⁻⁶ - ensures ±0.5 s/day timekeeping accuracy under supply ripple |
| Battery EOL detection | Enabled - triggers diagnostic 4-pulse bursts every 4 s when VDD ≤ VEOL (1.27–1.46 V) |
| EEPROM reprogrammability | Up to 100 cycles - supports field recalibration of quartz drift without hardware replacement |
Pinout & Package
PCA1626U/F2,026 is supplied in chip-in-tray format (no leaded package); bonding pad layout matches PCA16xxU series with 8-terminal die (chip area: 2.91 mm², thickness: 200 ±25 µm).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VSS | Ground reference | 0 V return path for all internal circuits and motor outputs |
| TEST | Test output | Provides 32 Hz signal during stop mode; indicates EEPROM erase status (logic 1) |
| OSC IN | Oscillator input | Connects to quartz crystal terminal; internal 10 pF capacitance sets load condition |
| OSC OUT | Oscillator output | Drives second crystal terminal; internal 15 pF capacitance enables positive-only frequency offset |
| VDD | Positive supply | 1.2–2.5 V operating range; 5.1 V pulses enable EEPROM programming and verification |
| M1 / M2 | Motor outputs | Differential bipolar drive outputs; saturation voltage ≤200 mV ensures low-loss coil energization |
| RESET | Reset input | Active-low control: stops motor (3-state), enables test modes (T1/T2/T3), or initiates calibration sequence |
Key Features
| Feature | Design Value |
|---|---|
| 32.768 kHz oscillator with amplitude regulation | Starts reliably at 1.2 V with 1 s startup time; transconductance 6–15 µS ensures robust crystal drive |
| Electrically programmable time calibration | Compensates quartz deviation via EEPROM-stored pulse inhibition count (n = 0–63), adjustable in 2.03×10⁻⁶ steps |
| Battery voltage level detection | Dual-threshold comparator (VLIT/VEOL) automatically selects lithium or silver-oxide operating mode and flags end-of-life |
| Stop function with 3-state motor outputs | Connecting RESET to VDD halts motor pulses and places M1/M2 in high-impedance state, preventing unintended movement |
| Integrated power-on reset | Resets all flip-flops and ensures positive-polarity first motor pulse (VM1 − VM2 ≥ 0 V) for consistent hand positioning |
Applications
| Smart Analog Watch Movement | Low-Power Chronograph Module |
|---|---|
Use Scenario: Quartz analog wristwatch with date display and dual-time zone functionality requiring long battery life and factory calibration. IC Role / Device Role / Timing Role: Primary timekeeping engine generating 20 s motor pulses to drive stepping motor; provides EEPROM-based calibration and battery health monitoring. Use Value: Enables 5+ year operation on a single silver-oxide cell while maintaining ±0.5 s/day accuracy through field-reprogrammable calibration. | Use Scenario: Multi-function chronograph watch with start/stop/reset pushers and sub-dials, where motor sequencing must synchronize with digital logic. IC Role / Device Role / Timing Role: Dedicated motor driver IC triggered by microcontroller commands; uses RESET pin for synchronized stop/start and test mode entry. Use Value: Eliminates need for external timing logic; built-in debounce (14.7–123.2 ms) prevents false triggering from mechanical shock during button actuation. |
| Medical Diagnostic Timer | Industrial Equipment Panel Clock |
Use Scenario: Portable medical device (e.g., infusion pump timer) requiring traceable timekeeping and battery status indication for regulatory compliance. IC Role / Device Role / Timing Role: Standalone timing subsystem providing calibrated 20 s intervals and battery end-of-life warning via pulse burst pattern. Use Value: Delivers auditable time accuracy without software overhead; EOL detection (VEOL = 1.27–1.46 V) ensures predictable shutdown before critical failure. | Use Scenario: Front-panel clock in industrial HMI where ambient temperature varies (−10 to +60 °C) and maintenance access is infrequent. IC Role / Device Role / Timing Role: Low-power real-time clock generator interfacing directly to stepping motor; operates across full industrial temperature range with no external components. Use Value: Reduces BOM count to one IC + crystal; temperature coefficient of voltage detector (−1 mV/K) maintains stable mode switching across operating range. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar watch circuit applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| PCA1622U | Includes battery end-of-life detection and 1 s motor cycle time; same chip-in-tray format | Optimized for compact watches requiring faster motor response and EOL alerting | Select PCA1622U when 1 s timing granularity and mandatory EOL signaling are required |
| PCA1627U/7 | Chip-with-bumps-on-tape delivery; identical 20 s cycle, 5.8 ms pulse, and 100% drive but adds lithium-mode support | Targeted for automated die-bonding processes in high-volume watch manufacturing | Select PCA1627U/7 for bump-chip assembly lines needing lithium battery compatibility (1.5 V / 2.1 V) |
Compared with PCA1622U, PCA1626U/F2,026 trades faster motor cycling for extended timing intervals and omits EOL detection-ideal for cost-sensitive standard watches. Versus PCA1627U/7, it lacks lithium-mode support but uses tray delivery for manual or semi-automated assembly.
Availability
PCA1626U/F2,026 is available at Aetrix Electronics and suitable for smart analog watch movement, low-power chronograph module, and industrial equipment panel clock applications requiring stable component supply and long-lifecycle support.
Supply support for PCA1626U/F2,026 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
Philips Semiconductors (now NXP Semiconductors) is a global semiconductor innovator with leadership in analog, mixed-signal, and RF technologies for consumer, automotive, and industrial markets.
The PCA16xx series was developed specifically for battery-powered quartz wristwatches, integrating oscillator, motor driver, EEPROM calibration, and battery monitoring into a single ultra-low-power die to replace discrete timing solutions.
FAQ
What is the motor cycle time supported by the PCA1626U/F2,026?
The PCA1626U/F2,026 supports a fixed 20 s motor cycle time, meaning it generates one motor pulse every 20 seconds during normal operation. This interval is factory-set per the PCA16xx series ordering matrix and cannot be altered in-circuit. The 20 s timing aligns with standard analog watch gear ratios and enables optimal power efficiency for extended battery service life.
Does the PCA1626U/F2,026 include battery end-of-life detection?
No, the PCA1626U/F2,026 does not include battery end-of-life (EOL) detection. According to the "Available types" table in the datasheet, PCA1626U is explicitly marked "no" under the "BATTERY EOL DETECTION" column. Devices such as PCA1622U and PCA1627U/7 provide this feature, but PCA1626U/F2,026 relies on external monitoring or system-level voltage supervision instead.
How is time calibration performed on the PCA1626U/F2,026?
Time calibration on the PCA1626U/F2,026 is performed by programming an integer value 'n' (0–63) into its internal EEPROM using controlled VDD voltage pulses. This value determines how many 8192 Hz pulses are inhibited per minute to compensate for measured quartz frequency deviation. The process requires 10 precise VDD transitions between 2.5 V and 5.1 V, as defined in Figure 3 of the datasheet, and supports up to 100 reprogramming cycles.
What are the supply voltage requirements for normal operation and programming of the PCA1626U/F2,026?
The PCA1626U/F2,026 operates normally from 1.2 V to 2.5 V (typical 1.55 V), with supply current as low as 170 nA. For EEPROM programming, it requires precisely timed 5.1 V pulses (tolerance ±0.1 V) applied to VDD, with rise/fall times >400 µs/V. Programming sequences must avoid dropping VDD below 2.5 V during motor pulses, as that would restart the programming mode unintentionally.
Is the PCA1626U/F2,026 compatible with both lithium and silver-oxide batteries?
The PCA1626U/F2,026 supports silver-oxide batteries (1.55 V nominal) but does not implement lithium-mode operation. Its voltage detector thresholds (VLIT = 1.65–1.95 V, VEOL = 1.27–1.46 V) are configured for silver-oxide use only. Lithium-mode functionality (75% duty factor, 1.5 V / 2.1 V support) is present in variants like PCA1627U/7 and PCA1607U, but not in PCA1626U/F2,026.
PCA1626U/F2,026 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- NXP Semiconductors
- Series:
- *
- Package/Case:
- -
- Packaging:
- Bulk
- Product Status:
- Active
- Programmable:
- Not Verified
- Type:
- -
- PLL:
- -
- Input:
- -
- Output:
- -
- Number of Circuits:
- -
- Ratio - Input:Output:
- -
- Differential - Input:Output:
- -
- Frequency - Max:
- -
- Divider/Multiplier:
- -
- Voltage - Supply:
- -
- Operating Temperature:
- -
- Mounting Type:
- -
- Grade:
- -
- Qualification:
- -
- Supplier Device Package:
- -
PCA1626U/F2,026 FAQ
1.How can I place an order for PCA1626U/F2,026 through Aetrix?
Please submit a Request for Quotation (RFQ) for PCA1626U/F2,026 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 PCA1626U/F2,026 reliable?
The price and inventory of PCA1626U/F2,026 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for PCA1626U/F2,026 is usually 5 days.
3.What payment methods are accepted for PCA1626U/F2,026?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for PCA1626U/F2,026 transactions.
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4.How is shipping managed for PCA1626U/F2,026?
PCA1626U/F2,026 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your PCA1626U/F2,026 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 PCA1626U/F2,026?
For technical support, including PCA1626U/F2,026 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your PCA1626U/F2,026 requirements.
6.How does Aetrix verify that PCA1626U/F2,026 is sourced from the original manufacturer or authorized distributors?
All PCA1626U/F2,026 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 PCA1626U/F2,026 meets industry standards.
7.What is the process for return or replacement of PCA1626U/F2,026?
All PCA1626U/F2,026 units undergo pre-shipment inspection (PSI). If there is an issue with PCA1626U/F2,026, 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 PCA1626U/F2,026 part is unused and in its original packaging.
Return procedure for PCA1626U/F2,026:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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