PCA85063ATT/AJ

Real Time Clock Overview

The PCA85063ATT/AJ is an automotive-grade CMOS Real-Time Clock (RTC) and calendar optimized for low power consumption. It provides year, month, day, weekday, hours, minutes, and seconds based on a 32.768 kHz quartz crystal. The device features a programmable offset register for fine-tuning clock accuracy and supports a two-line bidirectional I2C-bus interface with a maximum data rate of 400 kbit/s. Operating at a clock voltage of 0.9 V to 5.5 V, it typically consumes 0.25 µA at VDD = 3.0 V and Tamb = 25 °C. It includes selectable integrated oscillator load capacitors for 7 pF or 12.5 pF crystals.

Real Time Clock Feature Summary

• AEC-Q100 Grade 2 compliant for automotive applications with operation range from -40 °C to +105 °C
• Programmable clock output providing frequencies of 32.768 kHz, 16.384 kHz, 8.192 kHz, 4.096 kHz, 2.048 kHz, 1.024 kHz, and 1 Hz
• Alarm function, countdown timer, minute/half-minute interrupts, and oscillator stop detection
• Internal Power-On Reset (POR) and software reset capability

Real Time Clock Applications

• Dashboard systems
• Infotainment units
• Air conditioning controls
• Center stack modules
• Telematics systems
• Body control and battery management

Real Time Clock Procurement Notes

Verify the specific ordering suffix AJ indicates tape and reel delivery form for the PCA85063ATT package. Confirm AEC-Q100 Grade 2 compliance requirements match the target automotive environment specifications. Ensure the I2C bus voltage levels are compatible with the 0.9 V to 5.5 V operating range. Check that the selected load capacitor setting (7 pF or 12.5 pF) matches the external quartz crystal specifications.

Real Time Clock Selection Notes

Select this component when an automotive-certified RTC with low power consumption is required. The integrated oscillator capacitors simplify PCB layout by reducing external component count. The programmable offset register allows for precise frequency adjustment to meet long-term accuracy requirements without external trimming components. Verify that the 400 kHz I2C speed meets the system communication bandwidth needs.

Real Time Clock Part Context

The PCA85063A is part of NXP's automotive real-time clock portfolio. The ATT variant denotes the TSSOP8 plastic thin shrink small outline package with an 8-lead body width of 3 mm. The marking code for this device is 063Q. It serves as a compact timing solution for vehicle electronics requiring reliable timekeeping under harsh thermal conditions.

Real Time Clock Replacement Considerations

Refer to Table 45 in the official datasheet for other NXP Real-Time Clock selections. No direct public substitute part numbers are listed in the provided documentation.