PCF2129T/2

Part: PCF2129 — NXP Semiconductors

Type: Real Time Clock (RTC)

Description: A CMOS Real Time Clock (RTC) and calendar with an integrated Temperature Compensated Crystal Oscillator (TCXO) and a 32.768 kHz quartz crystal, optimized for very high accuracy and very low power consumption, featuring selectable I2C-bus or SPI-bus interfaces.

Operating Conditions:

• Supply voltage: 1.8 V to 4.2 V
• Operating temperature: -40 °C to +85 °C

Key Specs:

• Typical accuracy (PCF2129AT): ±3 ppm from -15 °C to +60 °C
• Typical accuracy (PCF2129T): ±3 ppm from -30 °C to +80 °C
• Low supply current: typical 0.70 μA at VDD = 3.3 V
• I2C-bus interface speed: 400 kHz Fast-mode
• SPI-bus interface speed: maximum 6.5 Mbit/s
• Integrated crystal frequency: 32.768 kHz
• Watchdog timer periods: less than 1 ms to greater than 4 hours

Features:

• Temperature Compensated Crystal Oscillator (TCXO) with integrated capacitors
• Provides year, month, day, weekday, hours, minutes, seconds, and leap year correction
• Timestamp function with interrupt capability
• Battery backup input pin and switch-over circuitry
• Battery low detection function
• Power-On Reset Override (PORO)
• Oscillator stop detection function
• Programmable 1 second or 1 minute interrupt
• Programmable alarm function with interrupt capability
• Programmable square output

Applications:

• 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

Package:

• SO20 (20 leads)
• SO16 (16 leads)

• 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
• 3 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

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

Product data sheet

• 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 4. Pin description of PCF2129 Input or input/output pins must always be at a defined level (VSS or VDD) unless otherwise specified.

Table 4. Pin description of PCF2129 Input or input/output pins must always be at a defined level (VSS or VDD) unless otherwise specified.

Accurate RTC with integrated quartz crystal for industrial applications

RPU: For example, 10 k

.

For information about application configuration, see Ref. 3 'AN11186'.

Fig 49. Package outline SOT163-1(SO20)of PCF2129AT

## Accurate RTC with integrated quartz crystal for industrial applications

## Accurate RTC with integrated quartz crystal for industrial applications

62 SODVWLF VPDOO RXWOLQH SDFNDJH OHDGV ERG ZLGWK PP

627