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NXP Semiconductors PCA8802U/12AA/1,00
- Part No.:
- PCA8802U/12AA/1,00
- Manufacturer:
- NXP Semiconductors
- Category:
- Unclassified
- Package:
- Datasheet:
-
PCA8802U/12AA/1,00.pdf
- Description:
- IC SMARTCARD RTC UNCASED FFC
- Quantity:
- Payment:
- Shipping:
Inventory:2,707
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Product details
Overview
The PCA8802U/12AA/1,00 from NXP Semiconductors is an ultra-low-power smartcard real-time clock IC integrating a 32.768 kHz quartz oscillator with on-die 6 pF load capacitors, a 24-bit binary counter auto-incrementing every 32 seconds, I²C-bus interface (slave address 0xA0/0xA1), and push-pull INT output for microcontroller wake-up - deployed in one-time password (OTP) generators and battery-powered time-keeping circuits.
For engineers reviewing the PCA8802U/12AA/1,00 datasheet, PCA8802U/12AA/1,00 pinout, PCA8802U/12AA/1,00 application, or PCA8802U/12AA/1,00 equivalent, key selection criteria include its 130 nA typical supply current, deep-sleep mode via pwd_cmd instruction, counter freeze during I²C read access, 32-second interrupt timing accuracy, and WLCSP8 package compatibility with flexible polymer or button-cell power sources.
Technical Context
The PCA8802U/12AA/1,00 implements a three-stage divider chain (÷4 → ÷8192 → ÷32) to derive a precise 1/32 Hz clock from its internal 32.768 kHz oscillator, enabling deterministic 32-second counter increments. Its oscillator includes automatic gain control and supports external load capacitors for crystals with CL > 6 pF.
Communication uses a point-to-point I²C interface with push-pull SDA (eliminating external pull-ups) and strict 32-second access window enforcement - counter reads freeze the increment logic, and partial writes via set_cmd allow bit-field updates without full 24-bit reloads.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Oscillator frequency | 32.768 kHz ±20 ppm; enables precise timebase for OTP generation and RTC functions |
| Supply current (typ) | 130 nA at VDD = 3 V; allows multi-year operation on coin cells or thin-film batteries |
| Counter resolution | 24-bit binary roll-over; provides 199-day maximum count before overflow at 32 s intervals |
| I²C slave address | 0xA0 (write), 0xA1 (read); fixed hardware address simplifies system integration |
| Interrupt timing | Pulse generated coincident with counter increment every 32 seconds; used for low-power MCU wake-up |
| Deep sleep current | Static leakage only; oscillator halted via pwd_cmd instruction for shelf-life current reduction |
| Load capacitance | Integrated 6 pF capacitors; supports standard 32.768 kHz tuning-fork crystals without external components |
Pinout & Package
PCA8802U/12AA/1,00 is housed in a WLCSP8 (wafer-level chip-scale package) with 8 gold bumps, optimized for space-constrained smartcard and wearable applications. Mechanical dimensions and bump layout conform to NXP's WLCSP8 specification for 6-inch wafers with 200 µm thickness.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| INT (Pin 1) | Interrupt/test output | Push-pull signal; delivers 32-second wake-up pulse or 32.768 kHz test clock when enabled |
| VDD (Pin 2) | Power supply | Accepts 1.6 V to 5.5 V; powers oscillator, divider chain, counter, and I²C interface |
| TEST (Pin 3) | Test mode control | Must be tied to VSS; enables accelerated development modes like fst_cmd (1 Hz counter) |
| OSCO (Pin 4) | Oscillator output | Drives crystal's output terminal; part of integrated Pierce oscillator circuit |
| OSCI (Pin 5) | Oscillator input | Drives crystal's input terminal; completes resonator feedback path with internal amplifier |
| VSS (Pin 6) | Ground reference | Return path for all internal circuits; requires low-impedance connection to minimize noise |
| SCL (Pin 7) | I²C clock input | Asynchronous to oscillator; controls timing of data transfers per I²C protocol |
| SDA (Pin 8) | I²C bidirectional data | Push-pull output eliminates need for external pull-up resistors; supports point-to-point only |
Key Features
| Feature | Design Value |
|---|---|
| Amplitude-regulated oscillator | Maintains stable 32.768 kHz oscillation across voltage (1.6–5.5 V) and temperature (−40 °C to +85 °C) with high immunity to leakage currents |
| Counter freeze during I²C access | Prevents increment loss during read/write; ensures atomic counter value capture without software synchronization |
| Accurate counter start-up | dvs_cmd + set_cmd sequence enables sub-122 µs uncertainty in first 32-second interval after reset or deep sleep exit |
| User test modes | fst_cmd enables 1 Hz counter for rapid firmware validation; 32k_cmd outputs 32.768 kHz on INT for oscillator characterization |
| Deep sleep mode | pwd_cmd halts oscillator while retaining I²C accessibility - reduces current to static leakage only for extended storage |
Applications
| One-Time Password (OTP) Generator | Ultra-Low-Power Time Keeper |
|---|---|
Use Scenario: Embedded in contactless smartcards or secure tokens to generate time-based one-time passwords synchronized with authentication servers. IC Role / Device Role / Timing Role: Provides cryptographically secure time reference by delivering deterministic 32-second counter increments to seed HMAC-SHA1 calculation. Use Value: 130 nA typical current enables >5-year battery life on CR2032; integrated oscillator eliminates external crystal placement and matching capacitor routing. | Use Scenario: Maintaining elapsed time in energy-harvesting sensors or medical wearables where primary power is intermittent or ultra-low. IC Role / Device Role / Timing Role: Acts as autonomous time base independent of host MCU; wakes system only at scheduled 32-second intervals via INT pin. Use Value: Deep sleep mode (pwd_cmd) reduces shelf-life current to leakage-only levels; counter freeze ensures no time drift during host read operations. |
| Smartcard Real-Time Clock | Secure Element Time Stamping |
Use Scenario: Integrated into EMV-compliant payment cards requiring tamper-resistant, battery-backed timekeeping for transaction timestamping and offline authorization windows. IC Role / Device Role / Timing Role: Smartcard RTC subsystem; counter value is read over dedicated I²C bus to enforce time-limited cryptographic validity periods. Use Value: WLCSP8 package enables direct die bonding onto card substrate; light-shielded design prevents optical tampering per NXP safety notes. | Use Scenario: Used in trusted platform modules (TPMs) or secure elements to log event timestamps with guaranteed monotonicity and minimal power overhead. IC Role / Device Role / Timing Role: Tamper-evident time source; counter value is write-protected except via authenticated set_cmd with dvs_cmd synchronization. Use Value: Partial counter writes (e.g., updating only upper byte) enable efficient time sync without full 24-bit reload; interrupt pulse triggers secure logging upon each 32-second boundary. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar ultra-low-power RTC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| PCF2129AT/1,118 | Higher typical current (200 nA), integrated trickle-charge battery switch, no deep sleep mode | Designed for backup battery systems rather than primary cell operation; lacks pwd_cmd and fst_cmd test features | Select when secondary battery charging is required and shelf-life current is less critical than runtime accuracy. |
| RV-3028-C7 | Lower current (110 nA), built-in temperature compensation, I²C address configurable (0x51/0x52) | Targets industrial-grade timing with ±3 ppm stability; lacks integrated test modes and 32k_cmd output capability | Select when long-term aging stability and temperature compensation outweigh need for fast-mode development support. |
Compared with PCF2129AT/1,118 and RV-3028-C7, the PCA8802U/12AA/1,00 uniquely combines deep-sleep control (pwd_cmd), accurate counter restart (dvs_cmd), and dedicated test features (fst_cmd, 32k_cmd) - making it optimal for smartcard OTP and ultra-low-power timekeeping where development agility and shelf-life current are decisive.
Availability
PCA8802U/12AA/1,00 is available at Aetrix Electronics and suitable for one-time password generators, ultra-low-power time keeper circuits, and smartcard RTC applications requiring stable component supply, long-term lifecycle support, and wafer-level packaging compatibility.
Supply support for PCA8802U/12AA/1,00 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
NXP Semiconductors is a global semiconductor leader specializing in secure connectivity solutions for automotive, industrial, and IoT applications, with core expertise in smartcard, RFID, and ultra-low-power mixed-signal ICs.
The PCA8802U/12AA/1,00 belongs to NXP's Smartcard RTC product line, engineered specifically for secure, battery-operated timekeeping in resource-constrained environments such as contactless payment cards and cryptographic tokens.
FAQ
What is the primary function of the PCA8802U/12AA/1,00?
The PCA8802U/12AA/1,00 is an ultra-low-power smartcard RTC IC that integrates a 32.768 kHz oscillator, 24-bit counter incrementing every 32 seconds, and I²C interface. Its primary function is to provide deterministic, battery-efficient timekeeping for one-time password generation and secure time-stamping in smartcards and wearables. The PCA8802U/12AA/1,00 achieves this with 130 nA typical supply current and deep-sleep mode via pwd_cmd instruction.
How does the PCA8802U/12AA/1,00 handle counter reads without losing increments?
The PCA8802U/12AA/1,00 freezes the 24-bit counter during I²C read access (rd_cmd), ensuring the value remains stable throughout the transfer. Any scheduled increment is held until the read completes, preventing count loss. This behavior is enforced by hardware and requires read bursts terminated within 32 seconds - a constraint explicitly defined in the PCA8802U/12AA/1,00 functional description.
Can the PCA8802U/12AA/1,00 operate with crystals other than 6 pF load capacitance?
Yes - the PCA8802U/12AA/1,00 is optimized for 6 pF crystals but supports higher load capacitances using external capacitors. Its integrated oscillator circuit includes automatic gain control and two on-die 6 pF capacitors; adding external capacitors in parallel allows use with standard 12.5 pF or 15 pF tuning-fork crystals. This flexibility is documented in the PCA8802U/12AA/1,00 general description section.
What is the purpose of the TEST pin on the PCA8802U/12AA/1,00?
The TEST pin (Pin 3) on the PCA8802U/12AA/1,00 must be connected to VSS to enable user test modes including fst_cmd (1 Hz counter) and 32k_cmd (32.768 kHz output on INT). It is not a general-purpose I/O; leaving it floating or misconnected disables these development features. This requirement is specified in Table 5 (Pin Description) of the PCA8802U/12AA/1,00 datasheet.
Does the PCA8802U/12AA/1,00 support standard I²C pull-up resistors?
No - the PCA8802U/12AA/1,00 uses a push-pull SDA driver to eliminate external pull-up resistors and reduce power consumption. This design requires the host MCU's SDA line to also operate in push-pull mode; if the MCU uses open-drain SDA, a pull-up resistor is mandatory. This interface constraint is explicitly stated in Section 9.5.1 of the PCA8802U/12AA/1,00 datasheet.
PCA8802U/12AA/1,00 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- NXP Semiconductors
- Series:
- *
- Packaging:
- Bulk
- Product Status:
- Obsolete
PCA8802U/12AA/1,00 FAQ
1.How can I place an order for PCA8802U/12AA/1,00 through Aetrix?
Please submit a Request for Quotation (RFQ) for PCA8802U/12AA/1,00 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 PCA8802U/12AA/1,00 reliable?
The price and inventory of PCA8802U/12AA/1,00 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for PCA8802U/12AA/1,00 is usually 5 days.
3.What payment methods are accepted for PCA8802U/12AA/1,00?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for PCA8802U/12AA/1,00 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for PCA8802U/12AA/1,00?
PCA8802U/12AA/1,00 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your PCA8802U/12AA/1,00 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 PCA8802U/12AA/1,00?
For technical support, including PCA8802U/12AA/1,00 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your PCA8802U/12AA/1,00 requirements.
6.How does Aetrix verify that PCA8802U/12AA/1,00 is sourced from the original manufacturer or authorized distributors?
All PCA8802U/12AA/1,00 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 PCA8802U/12AA/1,00 meets industry standards.
7.What is the process for return or replacement of PCA8802U/12AA/1,00?
All PCA8802U/12AA/1,00 units undergo pre-shipment inspection (PSI). If there is an issue with PCA8802U/12AA/1,00, 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 PCA8802U/12AA/1,00 part is unused and in its original packaging.
Return procedure for PCA8802U/12AA/1,00:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
PCA8802U/12AA/1,00 Tags
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