MEMS-32.768kHz-100ppm
Ultra-low power 32.768kHz MEMS oscillator for real-time clock applications with 100ppm stability.
Product Overview
Description
This 32.768kHz MEMS oscillator provides the standard frequency for real-time clock applications with extremely low power consumption of only 1.5µA.
The MEMS technology eliminates the need for external load capacitors, simplifying circuit design and reducing BOM count. The device starts up in just 5ms.
With excellent shock resistance of 50,000g and wide temperature range, this oscillator is ideal for portable and battery-powered devices including wearables, IoT sensors, and medical devices.
Product Series
MEMS
Primary Application
Real-time clock
Key Features
- 32.768kHz standard frequency
- Ultra-low 1.5µA current
- No load capacitors needed
- Fast 5ms startup
Specifications
| Frequency | 32.768 kHz |
|---|---|
| Frequency Stability | ±100ppm over -40C to +85C |
| Supply Voltage | 1.5V to 3.3V |
| Output Type | CMOS |
| Output Level | Rail-to-rail |
| Operating Current | 1.5µA typical |
| Startup Time | 5ms max |
| Shock Resistance | 50,000g |
| Operating Temperature | -40C to +85C |
| Package | SMD 2.0 x 1.6 x 0.8mm |
Applications
Real-time clock
Electronic system design
Wearable devices
Electronic system design
IoT sensors
Sensor signal conditioning
Battery-powered systems
Battery and charging management
Medical devices
Medical electronics
FAE Expert Insights
"The MEMS-32.768kHz-100ppm is my go-to recommendation for RTC applications requiring ultra-low power. I have used this oscillator in numerous wearable and IoT designs with excellent results. The 1.5µA current consumption is significantly lower than quartz alternatives which typically require 5-10µA plus load capacitor leakage. The elimination of external load capacitors simplifies the design and reduces BOM cost. The 32.768kHz frequency is the standard for RTCs and the 100ppm accuracy is sufficient for most timekeeping applications (about 8.6 seconds per day drift). For battery-powered devices where every microamp counts, this MEMS oscillator is an excellent choice."
Ultra-low power MEMS RTC oscillator ideal for battery-powered devices
— Lisa Wang, BeiLuo
Frequently Asked Questions
Why choose MEMS over quartz for 32.768kHz RTC?
MEMS offers advantages for RTC applications: 1) Lower power - 1.5µA vs 5-10µA for quartz plus capacitor leakage. 2) No load capacitors - simplifies design, reduces BOM. 3) Better shock resistance - 50,000g vs 5,000g for quartz. 4) Faster startup - 5ms vs 100-500ms for quartz. 5) Smaller size - 2.0x1.6mm vs larger quartz packages. 6) No activity dips - smooth frequency vs temperature. Trade-offs: Slightly higher cost than basic quartz, 100ppm accuracy vs 20ppm for high-end quartz. For battery-powered and portable applications, MEMS advantages typically outweigh the cost difference.
Choose MEMS for battery-powered applications. Choose quartz for lowest cost if power is not critical.
How accurate is 100ppm for timekeeping?
100ppm (parts per million) accuracy means: Daily drift - 100ppm × 86,400 seconds = 8.64 seconds per day. Monthly drift - about 4.3 minutes per month. Yearly drift - about 52 minutes per year. This accuracy is sufficient for: General timekeeping, Consumer electronics, IoT devices, Most non-critical applications. For better accuracy, consider: 50ppm MEMS oscillator - 4.3 seconds/day drift. TCXO - <1 second/day drift. GPS synchronization - eliminates drift entirely. For most applications, 100ppm is adequate and the ultra-low power consumption is the primary benefit.
100ppm is sufficient for most RTC applications. Contact us for higher accuracy options if needed.
Can this oscillator be used with any RTC chip?
This MEMS oscillator is compatible with most RTC chips: Output type - CMOS square wave compatible with digital inputs. Frequency - standard 32.768kHz used by all RTCs. Voltage - 1.5V to 3.3V matches common RTC supplies. No load caps - RTC sees clean clock signal. Connection - connect output to RTC X1/CLKIN pin, leave X2 unconnected. Check your RTC datasheet for: Input voltage levels, Clock input pin name, Any specific requirements. Most modern RTCs accept external clock input. Some older RTCs may require specific interface - check compatibility.
Compatible with most RTC chips. Verify your RTC accepts external clock input.
What is the battery life impact?
Battery life impact of this MEMS oscillator: Current consumption - 1.5µA typical. Battery capacity - typical CR2032 coin cell = 225mAh. Backup time calculation - 225mAh / 1.5µA = 150,000 hours = 17 years. Compare to quartz: Quartz oscillator - 5-10µA. Load capacitor leakage - 1-5µA. Total quartz - 6-15µA. Battery life with quartz - 225mAh / 10µA = 22,500 hours = 2.6 years. The MEMS oscillator extends battery life by 6-8x compared to typical quartz solutions. This is critical for devices requiring long battery life without replacement.
MEMS significantly extends battery life. Ideal for long-life battery-powered devices.
Does the oscillator need decoupling capacitors?
Yes, power supply decoupling is recommended: Required capacitor - 100nF ceramic close to VDD pin. Optional - 1µF bulk capacitor for additional filtering. Layout - place capacitor within 2mm of VDD pin. Benefits - ensures stable operation, reduces jitter, prevents noise coupling. The oscillator is low power but still benefits from clean power. The decoupling is simpler than quartz which requires load capacitors. Total capacitors needed: MEMS - 1 decoupling cap. Quartz - 2 load caps + 1 decoupling cap. This simplification is one of the advantages of MEMS oscillators.
Use 100nF decoupling capacitor. Simpler than quartz load capacitor requirements.