Servo Drives

Electric motors (AC servo motor, DC brush-less motor, and stepping motor)

More and more, today’s servo drives must provide precise control of multiple variables. This control requires precision timing products that can withstand the continuous vibration and shock from motors and the environments in which they operate. SiTime MEMS oscillators are stable, reliable, and robust in harsh conditions, have a wide operating temperature and come in small footprints.

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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

Precision control in automation — whether in medical robotics, factory automation, textile manufacturing, printing, or autonomous vehicles — has experienced explosive growth over the past decade. Irrespective of the type of motor and application, achieving a high level of precision of multiple variables such as torque, position, speed, and angle have necessitated the use of oscillators instead of crystals to achieve the required precision in these applications.

Encoders have traditionally used crystals in the measurement of speed, torque, and position. To control multiple variables in high precision motors, drivers must continuously receive input from the encoders and instantly take corrective action through feedback to the motors. As motor manufacturers strive to improve precision with faster response, they have begun to implement drivers alongside each motor. This subjects drivers to higher vibration and shock, requiring robust components that can meet design considerations.

SiTime oscillators are robust and can withstand the continuous vibration and shock from motors and the environments in which they are used. Besides enabling good SNR (signal-to-noise ratio), SiTime oscillators offer strong protection against moisture permeability and the ingress of chemical and gas particulates. In addition, they offer the following benefits:

Wide operating temperature
Temperature stability
Small size

Servo Drives Block Diagram

MEMS Timing for Servo Drives

Devices	Key Features	Key Values
Oscillator SiT8920 1 to 110 MHz	2.0 x 1.6 mm package -55ºC to 125ºC operating temperature	Small device size High reliability Resilient to electromagnetic Interference, ideal for high-current environments
Spread Spectrum Oscillator SiT9025 1 to 150 MHz	-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 SiT1811 32.768 kHz	±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 Advantages

All SiTime devices offer the following advantages over quartz crystals, which are particularly important for industrial applications:

Up to 50x better reliability than quartz oscillators
Up to 10x better resilience to shock, vibration and electromagnetic interference, due to the smaller size (0.4 x 0.4 mm) and lower mass of MEMS resonators compared to crystals
SiT9025 EMI reduction features: spread spectrum and configurable rise/fall times
Factory programmable to any frequency within range
No activity dips or cold start issues