PCF85363ATT1/AZ vs RV-4162-C7-32.768KHZ-20PPM-TA-QA

Part Number	PCF85363ATT1/AZ	RV-4162-C7-32.768KHZ-20PPM-TA-QA
Category	Clock/Timing - Real Time Clocks	Clock/Timing - Real Time Clocks
Manufacturer	NXP USA Inc.	Micro Crystal AG
Description	IC RTC CLK/CALENDAR I2C 10TSSOP	IC RTC CLK/CALENDAR I2C 8-SMT
Package	Tape & Reel (TR)	Tape & Reel (TR)
Series	Automotive, AEC-Q100	Automotive, AEC-Q200
Type	Clock/Calendar	Clock/Calendar
Features	Alarm, Leap Year, Watchdog Timer	Alarm, Leap Year, Watchdog Timer
Time Format	HH:MM:SS:hh (12/24 hr)	HH:MM:SS:hh
Date Format	YY-MM-DD-dd	YY-MM-DD-dd
Interface	I²C, 2-Wire Serial	I²C
Voltage - Supply	0.9V ~ 1.8V, 0.9V ~ 5.5V	1V ~ 4.4V
Current - Timekeeping (Max)	0.885µA @ 3.3V	0.5µA @ 3V
Operating Temperature	-40°C ~ 85°C (TA)	-40°C ~ 85°C (TA)
Mounting Type	Surface Mount	Surface Mount
Package / Case	10-XFDFN Exposed Pad	8-WCDFN
Supplier Device Package	10-DFN (2.6x2.6)	8-SON (3.2x1.5)
Memory Size	64B	-
Voltage - Supply, Battery	0.9V ~ 5.5V	-

1. How does a real-time clock work?

RTC is usually driven by a low-power oscillator (such as a quartz crystal oscillator) and powered by an independent power source (such as a battery), which can continuously time even when the main power supply is off.
2. How to communicate with real-time clock in the device?

Real time clocks typically communicate with microcontrollers or other processors through I2C or SPI communication interfaces, allowing for the reading and setting of time and other related information.
3. How often do RTC batteries need to be replaced?

The battery life of RTC can usually last for several years, depending on the type of battery used, the power consumption of RTC, and the ambient temperature. Generally speaking, button batteries can last for 5-10 years under normal conditions.
4. Can real-time clocks be used to set timers or alarms?

Yes, many RTC chips have built-in alarm functions that can trigger interrupts at set times to perform specific tasks or wake up the system.