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NXP Semiconductors PCA8802CX8/B/1,027
- Part No.:
- PCA8802CX8/B/1,027
- Manufacturer:
- NXP Semiconductors
- Category:
- Real Time Clocks
- Package:
- Die
- Datasheet:
-
PCA8802CX8/B/1,027.pdf
- Description:
- IC RTC BINARY COUNTER I2C DIE
- Quantity:
- Payment:
- Shipping:
Inventory:2,870
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Product details
Overview
PCA8802CX8/B/1,027 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 - designed for one-time password (OTP) generation in battery-powered smartcards.
For engineers reviewing the PCA8802CX8/B/1,027 datasheet, PCA8802CX8/B/1,027 pinout, PCA8802CX8/B/1,027 application, or PCA8802CX8/B/1,027 equivalent, key selection criteria include sub-150 nA typical operating current, deep sleep mode with oscillator stop, 32-second interrupt timing accuracy, and WLCSP8 package compatibility with flexible polymer or button-cell power sources.
Technical Context
The PCA8802CX8/B/1,027 implements a three-stage divider chain (÷4 → ÷8192 → ÷32) to derive a precise 1/32 Hz clock from its integrated 32.768 kHz oscillator. Its I²C interface uses push-pull SDA to eliminate external pull-ups, supporting point-to-point communication only.
Counter access freezes incrementation during read/write cycles, preventing race conditions; the dvs_cmd instruction enables deterministic counter start-up by halting dividers before set_cmd, while pwd_cmd enters deep sleep with oscillator disabled and static leakage as sole current draw.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Oscillator frequency | 32.768 kHz ±20 ppm; optimized for 6 pF crystal load capacitance |
| Supply current (typ) | 130 nA at VDD = 3 V; enables >10-year battery life with coin cells |
| Counter resolution | 24-bit binary roll-over; increments every 32 s (1/32 Hz), full-scale ≈ 154 days |
| I²C interface | Standard-mode only; slave address 0xA0 (write), 0xA1 (read); push-pull SDA |
| Interrupt output | Push-pull INT pin pulses once per 32 s coincident with counter update |
| Operating voltage | 1.6 V to 5.5 V; supports wide-range battery chemistries including Li-Polymer |
| Deep sleep current | <100 nA; oscillator stopped, I²C interface remains accessible |
Pinout & Package
PCA8802CX8/B/1,027 is housed in a Wafer-Level Chip-Scale Package (WLCSP8) with 8 solder bumps, footprint-optimized for space-constrained smartcard and wearable applications.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| INT (Pin 1) | Interrupt/test output | Push-pull signal; asserts every 32 s for MCU wake-up; configurable as 32.768 kHz test output |
| VDD (Pin 2) | Power supply | 1.6–5.5 V input; powers oscillator, counter, and I²C logic |
| TEST (Pin 3) | Test control | Must be tied to VSS; enables internal test modes when asserted |
| OSCO (Pin 4) | Oscillator output | Drives crystal's output terminal; internal gain control ensures reliable start-up |
| OSCI (Pin 5) | Oscillator input | Connects to crystal's input terminal; integrates 6 pF load capacitor |
| VSS (Pin 6) | Ground reference | 0 V return path for all analog and digital circuits |
| SCL (Pin 7) | I²C clock input | Asynchronous to oscillator; defines bit timing for serial interface |
| SDA (Pin 8) | I²C bidirectional data | Push-pull driver eliminates need for external pull-up resistors |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 32.768 kHz oscillator | Includes matched 6 pF load capacitors and automatic gain control for robust crystal start-up across temperature and aging |
| 24-bit counter with freeze-on-access | Prevents corruption during I²C reads/writes; counter resumes increment after interface transaction completes |
| Deep sleep mode (pwd_cmd) | Stops oscillator and reduces current to <100 nA while retaining I²C accessibility for wake-up configuration |
| Deterministic counter start (dvs_cmd + set_cmd) | Enables accurate time setting by halting dividers before loading counter value, eliminating timing uncertainty |
| Fast development mode (fst_cmd) | Temporarily increments counter every second instead of 32 s, accelerating OTP algorithm validation |
Applications
| Smartcard OTP Generation | Ultra-Low-Power Timekeeping |
|---|---|
Use Scenario: Embedded in contactless payment cards to generate time-based one-time passwords synchronized with backend servers. IC Role / Device Role / Timing Role: Provides cryptographically secure time base via 24-bit counter incremented every 32 s; INT pulse triggers MCU to compute HMAC-SHA1 digest. Use Value: Enables offline, battery-independent OTP generation with >10-year shelf life using a single CR2032 cell. | Use Scenario: Maintaining real-time calendar and alarm functions in medical wearables powered by thin-film batteries. IC Role / Device Role / Timing Role: Acts as primary RTC source; counter value read over I²C to update display or trigger sensor sampling at fixed intervals. Use Value: Delivers 130 nA typical current draw, extending device runtime without compromising time accuracy or interrupt reliability. |
| Secure Access Token | Industrial Sensor Node Clock |
Use Scenario: Integrated into physical security tokens for enterprise two-factor authentication systems. IC Role / Device Role / Timing Role: Generates time-synchronized challenge-response codes; deep sleep mode preserves battery during idle periods. Use Value: Supports secure time-stamping with deterministic counter restart (±122 µs uncertainty) for audit-trail compliance. | Use Scenario: Providing low-drift time base for periodic environmental sensing in remote IoT nodes powered by energy harvesting. IC Role / Device Role / Timing Role: Supplies precise 32-second wake-up intervals to synchronize ADC sampling and wireless transmission bursts. Use Value: Eliminates need for external crystal and load caps, reducing BOM count and PCB area in constrained form factors. |
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), includes integrated temperature sensor and alarm registers; no deep sleep oscillator stop | Better suited for ambient-aware timekeeping but lacks PCA8802CX8/B/1,027's sub-150 nA optimization for multi-year coin-cell operation | Select when temperature compensation or alarm functionality is required; avoid if minimum quiescent current is critical |
| RV-3028-C7 | Lower typical current (110 nA), supports 1.1–5.5 V, includes automatic battery switchover; I²C open-drain interface requires pull-ups | Superior voltage range and backup switching, but higher pin count (10-pin DFN) and external cap dependency increase system complexity | Choose for designs needing seamless primary/backup power transition; PCA8802CX8/B/1,027 preferred for minimal footprint and zero external components |
Compared with PCF2129AT/1,118 and RV-3028-C7, the PCA8802CX8/B/1,027 delivers the lowest active current in its class while integrating both load capacitors and push-pull I²C - enabling true single-chip RTC implementation in WLCSP8 for smartcards where board space and battery longevity are non-negotiable.
Availability
PCA8802CX8/B/1,027 is available at Aetrix Electronics and suitable for smartcard OTP generation, ultra-low-power timekeeping, and secure access token applications requiring stable component supply across extended production lifecycles.
Supply support for PCA8802CX8/B/1,027 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 focused on secure connectivity solutions for automotive, industrial, and IoT markets.
The PCA8802CX8/B/1,027 belongs to NXP's Smartcard RTC product line, engineered specifically for cryptographic time-base generation in resource-constrained, battery-operated secure elements.
FAQ
What is the primary function of the PCA8802CX8/B/1,027?
The PCA8802CX8/B/1,027 is an ultra-low-power real-time clock IC that integrates a 32.768 kHz oscillator, 24-bit binary counter, and I²C interface to generate precise 32-second timing intervals for one-time password (OTP) generation. Its core function is to provide a tamper-resistant, battery-efficient time base for secure smartcard applications - with the PCA8802CX8/B/1,027 delivering 130 nA typical current draw and deterministic counter control via dedicated instructions like dvs_cmd and set_cmd.
How does the PCA8802CX8/B/1,027 achieve ultra-low power consumption?
The PCA8802CX8/B/1,027 achieves ultra-low power through multiple design features: a 130 nA typical supply current at 3 V, integrated 6 pF load capacitors eliminating external components, push-pull I²C outputs removing pull-up resistor losses, and a deep sleep mode (pwd_cmd) that stops the oscillator while maintaining I²C accessibility. These features collectively enable multi-year operation on button cells - a capability confirmed in the PCA8802CX8/B/1,027 datasheet under standard operating conditions.
Can the PCA8802CX8/B/1,027 be used with crystals other than 6 pF load capacitance?
Yes, the PCA8802CX8/B/1,027 is optimized for 6 pF crystals but supports higher load capacitances using external capacitors. The datasheet explicitly states that "higher values can also be used with the addition of external load capacitors," and the oscillator circuit includes automatic gain control to ensure reliable start-up across variations in crystal series resistance (Rs) and load. This flexibility allows the PCA8802CX8/B/1,027 to accommodate diverse crystal suppliers and tolerances without redesign.
What is the role of the TEST pin on the PCA8802CX8/B/1,027?
The TEST pin (Pin 3) on the PCA8802CX8/B/1,027 must be connected to VSS to enable normal operation; it serves as an entry point for internal test modes used during accelerated application development and qualification. When asserted, it activates user test functions such as fast mode (fst_cmd) and 32.768 kHz output on INT - features documented in the PCA8802CX8/B/1,027 instruction set. Leaving TEST floating or high violates the absolute maximum ratings and may cause undefined behavior.
Does the PCA8802CX8/B/1,027 support standard I²C bus topologies?
No, the PCA8802CX8/B/1,027 supports point-to-point I²C only due to its push-pull SDA output, which eliminates external pull-up resistors but prevents multi-slave bus sharing. The datasheet specifies that "push-pull prevents the need for power consuming pull-up resistors, but requires that the SDA line of the microcontroller is a push-pull as well and does limit the operation to point-to-point only." Therefore, the PCA8802CX8/B/1,027 must be connected to a dedicated I²C port on the host MCU - not shared with other devices.
PCA8802CX8/B/1,027 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- NXP Semiconductors
- Series:
- -
- Package/Case:
- Die
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Type:
- Binary Counter
- Features:
- Square Wave Output, Unique ID
- Memory Size:
- -
- Time Format:
- Binary
- Date Format:
- Binary
- Interface:
- I2C, 2-Wire Serial
- Voltage - Supply:
- 1.6V ~ 5.5V
- Voltage - Supply, Battery:
- -
- Current - Timekeeping (Max):
- 0.4µA @ 1.6V ~ 5.5V
- Operating Temperature:
- -40°C ~ 85°C
- Mounting Type:
- -
- Grade:
- -
- Qualification:
- -
- Supplier Device Package:
- Die
PCA8802CX8/B/1,027 FAQ
1.How can I place an order for PCA8802CX8/B/1,027 through Aetrix?
Please submit a Request for Quotation (RFQ) for PCA8802CX8/B/1,027 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 PCA8802CX8/B/1,027 reliable?
The price and inventory of PCA8802CX8/B/1,027 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for PCA8802CX8/B/1,027 is usually 5 days.
3.What payment methods are accepted for PCA8802CX8/B/1,027?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for PCA8802CX8/B/1,027 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for PCA8802CX8/B/1,027?
PCA8802CX8/B/1,027 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your PCA8802CX8/B/1,027 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 PCA8802CX8/B/1,027?
For technical support, including PCA8802CX8/B/1,027 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your PCA8802CX8/B/1,027 requirements.
6.How does Aetrix verify that PCA8802CX8/B/1,027 is sourced from the original manufacturer or authorized distributors?
All PCA8802CX8/B/1,027 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 PCA8802CX8/B/1,027 meets industry standards.
7.What is the process for return or replacement of PCA8802CX8/B/1,027?
All PCA8802CX8/B/1,027 units undergo pre-shipment inspection (PSI). If there is an issue with PCA8802CX8/B/1,027, 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 PCA8802CX8/B/1,027 part is unused and in its original packaging.
Return procedure for PCA8802CX8/B/1,027:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
PCA8802CX8/B/1,027 Tags
-
MCP7940N-I/SN
Microchip Technology
-
MCP7940MT-I/MNY
Microchip Technology
-
PCF85063ATL/1,118
NXP USA Inc.
-
MCP7940NT-I/SN
Microchip Technology
-
MCP7940NT-I/MS
Microchip Technology
-
MCP7940N-I/MS
Microchip Technology
-
PCF85063AT/AY
NXP USA Inc.
-
PCF85063TP/1Z
NXP Semiconductors
-
PCF85063ATT/AJ
NXP USA Inc.
-
MCP7940NT-E/SN
Microchip Technology
-
MCP7940NT-I/MNY
Microchip Technology
-
MCP79400T-I/SN
Microchip Technology
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