V3025SO28A+ vs ICM7170AIBG

Part Number	V3025SO28A+	ICM7170AIBG
Category	Clock/Timing - Real Time Clocks	Clock/Timing - Real Time Clocks
Manufacturer	EM Microelectronic	Rochester Electronics, LLC
Description	VERY LOW POWER 8-BIT 32KHZ RTC M	REAL TIME CLOCK, CMOS, PDSO24
Package	Tube	Bulk
Series	-	-
Type	Clock/Calendar	Clock/Calendar
Features	Alarm, Leap Year, RAM	Alarm
Time Format	HH:MM:SS:hh (12/24 hr)	HH:MM:SS:hh (12/24 hr)
Date Format	YY-MM-DD-dd	YY-MM-DD-dd
Interface	-	-
Voltage - Supply	2V ~ 5.5V	1.9V, 2.6V ~ 5.5V
Current - Timekeeping (Max)	15µA @ 5.5V	20µA @ 5V
Operating Temperature	-40°C ~ 85°C (TA)	-40°C ~ 85°C (TA)
Mounting Type	Surface Mount	Surface Mount
Package / Case	28-SOIC (0.295\", 7.50mm Width)	24-SOIC (0.295\", 7.50mm Width)
Supplier Device Package	28-SOIC	24-SOIC
Memory Size	8B	-
Voltage - Supply, Battery	-	2.8V ~ 3.5V

1. Why do devices require real-time clocks?

Real time clocks are used to record and maintain accurate time and date, especially in the event of equipment power failure. It is very important in applications that require timestamps, scheduled events, scheduled logs, and so on.
2. How does RTC maintain time even when the device is powered off?

RTC is usually equipped with an independent small battery (such as a button battery) to ensure that it continues to run for time when the device's main power is turned off, until the battery is depleted or re powered.
3. 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.
4. How to choose a suitable RTC chip?

When choosing RTC, factors such as power consumption, communication interface (I2C/SPI), time accuracy, whether there is a built-in crystal or external crystal required, battery support, temperature range, and whether there is an alarm function should be considered.