PCF2129AT

Part: PCF2129T/2,518 (PCF2129 family) — NXP Semiconductors

Type: Temperature-Compensated Real-Time Clock/Calendar (TCXO RTC) with integrated 32.768 kHz quartz crystal

Description: Accurate RTC/calendar with integrated TCXO and quartz crystal, ±3 ppm typical accuracy, 1.8–4.2 V clock operating voltage, I²C (400 kHz) or SPI (6.5 Mbit/s) interface, and 0.70 μA typical supply current at VDD = 3.3 V.

Operating Conditions:

• Clock operating voltage: 1.8 V to 4.2 V
• Operating temperature: -40 to +85 °C
• I²C-bus: 400 kHz Fast-mode; SPI-bus: up to 6.5 Mbit/s

Absolute Maximum Ratings:

• Max supply voltage (VDD): 6.5 V
• Max battery supply voltage (VBAT): 6.5 V
• Max supply current (IDD): 50 mA
• Max input voltage (Vi): 6.5 V
• Max output current (IO): 10 mA (20 mA at pin SDA/CE)
• Max total power dissipation: 300 mW
• Storage temperature: -55 to +85 °C
• ESD: ±4000 V HBM, ±1250 V CDM

Key Specs:

• Typical accuracy (PCF2129T): ±3 ppm from -30 °C to +80 °C
• Typical accuracy (PCF2129AT): ±3 ppm from -15 °C to +60 °C
• Supply current: typ. 0.70 μA at VDD = 3.3 V
• Clock operating voltage: 1.8 V to 4.2 V
• I²C-bus speed: 400 kHz Fast-mode
• SPI-bus speed: max 6.5 Mbit/s
• Latch-up current: max 200 mA
• Ambient operating temperature: -40 to +85 °C

Features:

• Temperature Compensated Crystal Oscillator with integrated capacitors and 32.768 kHz quartz crystal
• Year, month, day, weekday, hours, minutes, seconds, and leap year correction
• Timestamp function with interrupt capability; two event types detected on one multilevel input pin (e.g., tamper detection)
• Selectable I²C-bus or 3-line SPI-bus interface
• Battery backup input with switch-over circuitry, battery-backed output voltage, and battery low detection
• Power-On Reset Override (PORO)
• Oscillator stop detection
• Open-drain interrupt output
• Programmable 1 second or 1 minute interrupt
• Programmable watchdog timer with interrupt
• Programmable alarm with interrupt
• Programmable square-wave clock output (32.768 kHz down to 1 Hz)
• Aging offset register for crystal aging correction
• UL Recognized Component (PCF2129AT and PCF2129T)

Applications:

• Electronic metering for electricity, water, and gas
• Precision timekeeping
• Access to accurate time of day
• GPS equipment to reduce time to first fix
• Applications requiring accurate process timing
• Products with long automated unattended operation time

Package:

• SO16 (SOT162-1), 16 leads, 7.5 mm body width — PCF2129T
• SO20 (SOT163-1), 20 leads, 7.5 mm body width — PCF2129AT

• UL Recognized Component (PCF2129AT and PCF2129T)
• Operating temperature range from -40 °C to +85 °C
• Temperature Compensated Crystal Oscillator (TCXO) with integrated capacitors
• Typical accuracy:
• -PCF2129AT: ±3 ppm from -15 °C to +60 °C
• -PCF2129T: ±3 ppm from -30 °C to +80 °C
• Integration of a 32.768 kHz quartz crystal and oscillator in the same package
• Provides year, month, day, weekday, hours, minutes, seconds, and leap year correction
• Timestamp function
• -with interrupt capability
• -detection of two different events on one multilevel input pin (for example, for tamper detection)
• Two line bidirectional 400 kHz Fast-mode I 2 C-bus interface
• Three line SPI-bus with separate data input and output (maximum speed 6.5 Mbit/s)
• Battery backup input pin and switch-over circuitry
• Battery backed output voltage
• Battery low detection function
• Power-On Reset Override (PORO)
• Oscillator stop detection function
• Interrupt output (open-drain)
• Programmable 1 second or 1 minute interrupt
• Programmable watchdog timer with interrupt
• Programmable alarm function with interrupt capability
• Programmable square output
• Clock operating voltage: 1.8 V to 4.2 V

1 The definition of the abbreviations and acronyms used in this data sheet can be found in Section 20.

• Low supply current: typical 0.70 μA at VDD = 3.3 V

• Electronic metering for electricity, water, and gas
• Precision timekeeping
• Access to accurate time of the day
• GPS equipment to reduce time to first fix
• Applications that require an accurate process timing
• Products with long automated unattended operation time

Table 3. Pin description of PCF2129

Input or input/output pins must always be at a defined level (VSS or VDD) unless otherwise specified.

For information about application configuration, see [1].

All information provided in this document is subject to legal disclaimers.

© 2022 NXP B.V. All rights reserved.

Accurate RTC with integrated quartz crystal for industrial applications

© 2022 NXP B.V. All rights reserved.

Accurate RTC with integrated quartz crystal for industrial applications

© 2022 NXP B.V. All rights reserved.