NXP Semiconductors PCA85063ATT/AJ

Overview

PCA85063ATT/AJ from NXP Semiconductors is an AEC-Q100 Grade 2 automotive RTC/calendar IC with I²C interface, alarm and countdown timer functions, programmable CLKOUT (1 Hz to 32.768 kHz), and offset calibration. It operates from 0.9 V to 5.5 V, draws only 0.25 µA at 3.0 V/25 °C, and supports full time/date tracking (year/month/day/hour/minute/second/weekday) in BCD format across –40 °C to +105 °C.

For engineers reviewing the PCA85063ATT/AJ datasheet, PCA85063ATT/AJ pinout, PCA85063ATT/AJ application, or PCA85063ATT/AJ equivalent, this page delivers verified technical context, validated pin functionality, confirmed automotive-grade timing performance, and real-world substitution guidance for dashboard, telematics, and body control systems.

Technical Context

The PCA85063ATT/AJ integrates a 32.768 kHz oscillator with selectable internal load capacitors (7 pF or 12.5 pF), auto-incrementing 18×8-bit register map (00h–11h), and BCD-coded time/date registers (04h–0Ah). Its I²C-bus interface supports up to 400 kbit/s and handles register addressing without external address bytes.

It implements dual correction modes: MODE = 0 applies offset pulses every 2 hours (1 pulse/min), while MODE = 1 applies them every 4 minutes (up to 60 pulses/sec). Alarm logic uses dedicated registers (0Bh–0Fh); timer control resides in 10h/11h; and interrupt generation is managed via INT (open-drain) with configurable sources (alarm, minute/half-minute, timer).

Key Specifications

Pinout & Package

TSSOP8 package (SOT505-1), 3 mm body width, 0.65 mm pitch - compatible with standard automotive PCB assembly processes and space-constrained modules like instrument clusters.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar RTC applications.

Compared with PCF2129AT/1,118 and RV8803-C2-EVL, the PCA85063ATT/AJ uniquely combines AEC-Q100 Grade 2 compliance, fine-grained BCD alarm registers, and dual-mode offset calibration - making it the optimal choice for production automotive modules requiring certified reliability and field-adjustable timing precision.

Availability

PCA85063ATT/AJ is available at Aetrix Electronics and suitable for dashboard instrumentation, telematics gateways, and body control modules requiring stable component supply across automotive production lifecycles.

Supply support for PCA85063ATT/AJ 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 deep expertise in timing, power management, and embedded security.

The PCA85063ATT/AJ belongs to NXP's automotive RTC product line, engineered specifically for high-reliability, low-power timekeeping in harsh vehicle environments - supporting critical functions from infotainment synchronization to emission control timestamping.

FAQ

What is the operating voltage range of the PCA85063ATT/AJ?

The PCA85063ATT/AJ operates from 0.9 V to 5.5 V, enabling direct compatibility with both modern low-voltage microcontrollers (1.8 V, 3.3 V) and legacy 5 V automotive subsystems. This wide range eliminates the need for external voltage translators in mixed-supply designs and supports brown-out resilience during cranking conditions in 12 V vehicle electrical systems. The PCA85063ATT/AJ maintains full RTC functionality-including alarm, timer, and I²C communication-across this entire range.

Does the PCA85063ATT/AJ support automatic register address incrementing during I²C transfers?

Yes, the PCA85063ATT/AJ implements auto-incrementing register addressing: after each byte read or write, the internal address pointer advances to the next sequential register (00h → 01h → 02h…), wrapping from 11h back to 00h. This feature reduces I²C transaction overhead-enabling full time/date register reads (04h–0Ah) in a single START–READ sequence without repeated address bytes. The PCA85063ATT/AJ adheres strictly to this behavior per its functional description in Section 8 of the datasheet.

How does the offset calibration function work in the PCA85063ATT/AJ?

The PCA85063ATT/AJ uses an 7-bit two's complement offset register (02h) to apply correction pulses that adjust effective second duration-not oscillator frequency. In MODE = 0 (default), corrections occur every 2 hours (1 pulse/min); in MODE = 1, every 4 minutes (up to 60 pulses/sec). Each LSB equals ±4.34 ppm (MODE = 0) or ±4.069 ppm (MODE = 1). The PCA85063ATT/AJ generates INT pulses during correction, allowing host firmware to monitor calibration progress and achieve ±2 ppm accuracy post-tuning.

What are the supported CLKOUT frequencies and their design implications?

The PCA85063ATT/AJ offers seven programmable CLKOUT frequencies: 32.768 kHz, 16.384 kHz, 8.192 kHz, 4.096 kHz, 2.048 kHz, 1.024 kHz, and 1 Hz-selected via COF[2:0] bits in Control_2 (01h). Frequencies ≥4.096 kHz retain 60:40–40:60 duty cycle; all others deliver 50:50. The STOP bit disables CLKOUT for frequencies ≤4.096 kHz (driving LOW), preserving power during RTC suspension. The PCA85063ATT/AJ's push-pull CLKOUT drives loads directly without external buffers, simplifying clock distribution in resource-constrained ECUs.

Is the PCA85063ATT/AJ qualified for automotive use, and what does AEC-Q100 Grade 2 mean?

Yes, the PCA85063ATT/AJ is explicitly AEC-Q100 Grade 2 qualified, meaning it has passed accelerated stress tests for temperature cycling (–40 °C to +105 °C), humidity, ESD (±2 kV HBM), and mechanical shock-validating suitability for passenger compartment and under-hood automotive applications. Grade 2 certification confirms operation across the full –40 °C to +105 °C ambient range, with guaranteed parametric performance and reliability over 15+ year vehicle lifetimes. The PCA85063ATT/AJ meets these requirements without derating or external protection components.