Computer Numerical Control

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Computer numerical control (CNC) machines often operate in harsh environments characterized by high temperatures and vibration. These systems need a robust clocking solution that can handle these tough conditions. Compared to traditional quartz products, SiTime MEMS timing solutions provide better vibration resistance, better reliability, and better stability over temperature with up to +125°C operation.

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SiTime MEMS Timing Benefits

A leader in industrial timing

Better quality and reliability

Custom configured solutions

Small form factor

Accurate and robust

Excellent stability over temperature

Better shock/vibration resistance

EMI resilience

Easy to use, built to last

No quartz reliability issues

>2 billion hour MTBF

Lifetime warranty

CNC machines manufacture parts by cutting and shaping sections from hard materials such as plastics, metals, and wood. Automated motion control machines, like CNC, have three primary components: a command function, a drive/motion system, and a feedback system.

Precision is fundamental to CNC to ensure tight tolerance when manufacturing piece parts. The need for precision extends to the need for precise and resilient timing sources.

SiTime MEMS solutions provide timing for CNC equipment in two areas: the programmable logic controller (PLC) and the equipment control panel.

Clocking is needed in PLCs to control material and cutting head positioning:

  • Timing for CPU
  • Memory interface
  • Ethernet communication

Clocking is needed in the equipment control panel (main user interface) used to program and control the CNC machine. There are additional timing requirements for the motherboard and associated circuitry:

  • Timing for MCU
  • Interface to the display
  • Ethernet / fieldbus interface

Programmable Logic Controller and CNC/ Equipment Control

MEMS Timing for Computer Numerical Control (CNC)

Devices Key Features Key Values
MHz Oscillator
SiT8920  1 to 110 MHz
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  • 2.0 x 1.6 mm package
  • -55ºC to 125ºC operating temperature
  • Small size
  • High reliability
  • Resilient to electromagnetic Interference, ideal for high-current environments
Spread Spectrum Oscillator
SiT9025  1 to 150 MHz
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  • -55ºC to 125ºC operating temperature
  • Spread spectrum
  • System EMI reduction up to 17 dB
  • High reliability
  • Resilient to electromagnetic Interference, ideal for high-current environments
32.768 kHz​ Oscillator
  • ±20, ±50, ±100 ppm
  • 1.14 to 3.63 V supply
  • < 490 nA consumption
  • Up to -40°C to +105°C
  • 1.2 x 1.1 mm
  • < 115 ms startup time
  • Excellent stability
  • Low power
  • Small footprint
  • Faster startup time than 32.768 kHz tuning-fork crystal enables faster system startup

SiTime Timing Solutions Advantages

More robust in harsh environments

  • 4x better vibration resistance — 0.1 ppb/g typical
  • 20x better shock survivability

Better stability over a wide temperature range

  • Up to -55 to +125°C operation
  • Airflow and thermal shock resistant — 1 ppb/°C

Programmability for flexible design

  • Any frequency, any stability, any voltage within a wide range
  • Qualify once for multiple parts

High reliability

  • 50x better quality and reliability — over 2.2 billion-hour MTBF
  • Lifetime warranty

Unique features

  • EMI reduction — up to 30 dB lower
  • Low power for longer battery life — 4.5 µA at 100 kHz
  • Smaller size — 1.5 mm x 0.8 mm packages

MEMS Timing Outperforms Quartz

Higher Reliability

Better EMI Reduction

SiTime timing devices are up to 50x more reliable than legacy quartz
SiTime – Better Vibration Resistance


Immune to Vibration

Better Noise Rejection

SiTime – Immune to Vibration
SiTime – Better Noise Rejection
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