PCA2131 datasheet(67/85 Pages) NXP

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NXP Semiconductors

PCA2131

Nano-power highly accurate RTC with integrated quartz crystal for automotive applications

11 Application information

The PCA2131TF/Q900 is AEC-Q100 compliant for automotive applications. The operating temperature range is

from -40 °C to +105 °C and the time accuracy with temperature compensation is:

• ±3 ppm typical with ±8 ppm min/max from -40 °C to +85 °C

• ±8 ppm typical with ±15 ppm min/max from +85 °C to +105 °C

Above the maximum guaranteed operating temperature of +105 °C to the maximum ambient temperature

of +125 °C the PCA2131TF/Q900 TCXO, RTC and digital interfaces (I2C and SPI) functions continue to be

operational with the supply current increasing proportionally to temperature (see Figure 37 for the trend). The

temperature compensation circuity also continues to function and typical time accuracy of ±8 ppm has been

measured on the bench.

The general application diagram is shown in Figure 42.

aaa-041588

VDD

VDD(in)

VDD

VBAT

BBS

VDD

INTA

BBS

SDI

SDO

SDA/CE

IFS

TS1

CLKOUT

SCL

VSS

Rsup

Csup

100 nF

1 to 100 nF

RPU

Interface

PCA2131

INTA

I2C

SPI

TS2

TS3

TS4

VDD

INTB

RPU

INTB

RPU: 10 kΩ is recommended.

RSUP and CSUP: An appropriate RC filter needs to be added to guarantee the chip will only see <0.35 V/ms ramp down

rate on supply, even if Vdd_in ramp rate is very high.

Figure 42. General application diagram

PCA2131

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

Product data sheet

Rev. 2.0 — 5 October 2023

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