PCA21125 SPI-bus Real-Time Clock and calendar Rev. 2 25 November 2014 Product data sheet 1. General description 1 The PCA21125 is a CMOS Real-Time Clock (RTC) and calendar optimized for low-power consumption and an operating temperature up to 125 C. Data is transferred via a Serial Peripheral Interface (SPI-bus) with a maximum data rate of 6.0 Mbit/s. Alarm and timer functions are also available with the possibility to generate a wake-up signal on the interrupt pin. For a selection of NXP Real-Time Clocks, see Table 46 on page 41 2. Features and benefits AEC Q100 compliant for automotive applications. Provides year, month, day, weekday, hours, minutes, and seconds based on 32.768 kHz quartz crystal Resolution: seconds to years Clock operating voltage: 1.3 V to 5.5 V Low supply current: typical 0.8 A at T = 25 C amb 4-line SPI-bus with separate, but combinable data input and output Serial interface at V = 1.6 V to 5.5 V DD 1 second or 1 minute interrupt output Freely programmable timer with interrupt capability Freely programmable alarm function with interrupt capability Integrated oscillator capacitor Internal Power-On Reset (POR) Open-drain interrupt pin 3. Applications Automotive time keeping Metering 1. The definition of the abbreviations and acronyms used in this data sheet can be found in Section 21.PCA21125 NXP Semiconductors SPI-bus Real-Time Clock and calendar 4. Ordering information Table 1. Ordering information Type number Package Name Description Version PCA21125T TSSOP14 plastic thin shrink small outline SOT402-1 package 14 leads body width 4.4 mm 4.1 Ordering options Table 2. Ordering options Product type number Orderable part number Sales item Delivery form IC (12NC) revision PCA21125T/Q900/1 PCA21125T/Q900/1,1 935290408118 tape and reel, 13 inch 1 5. Marking Table 3. Marking codes Type number Marking code PCA21125T/Q900/1 PC21125 PCA21125 All information provided in this document is subject to legal disclaimers. NXP Semiconductors N.V. 2014. All rights reserved. Product data sheet Rev. 2 25 November 2014 2 of 49