Smart Watches and Fitness Trackers

Smartwatches and fitness trackers must be feature-rich, user-friendly, and beautiful. These devices must continually incorporate the latest technology to enable a growing list of functions, while at the same time consume less space and power. Plus, at the end of the day, they need to deliver accurate time with no drift.

SiTime MEMS 32 kHz oscillators provide the solution for smartwatches and activity trackers to win in both form and function – with ultra-small, low-power, high-accuracy timing.

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SiTime MEMS Timing Benefits

Smallest footprint and power

1.2 mm² CSP

Ultra-low power from <1 µA

Ability to drive multiple loads

Robust clocking solutions

±5 ppm frequency stability

Immunity to power supply noise

Gas hermetically sealed

Integrated MEMS, easy to use

No external quartz

No quartz reliability issues

No cover or shielding

Smart Watches and Fitness Trackers Block Diagram

32 kHz MEMS Timing for Smart Watches and Fitness Trackers

Devices	Key Features	Key Values
32.768 kHz Oscillator SiT1811 32.768 kHz	±20 ppm stability 1.35 to 1.98 V supply 510 nA consumption Up to -10°C to 85°C 1.2 x 1.1 mm package <115 ms startup time	Low power Small footprint Excellent stability Faster start-up time than 32.768 kHz tuning-fork crystal enables faster system start-up
32.768 kHz TCXO SiT1580 32.768 kHz	±5 to ±20 ppm stability 1.8 V supply range 4.5 uA consumption 1.5 x 0.8 mm package	Low power High robustness: Immune to small molecular gasses LVCMOS: Drive multiple loads Stability: ±5 ppm
32.768 kHz TCXO SiT1552 32.768 kHz	±5 to ±20 ppm stability 990 nA typ. consumption 1.5 V to 3.65 V supply range 1.5 x 0.8 mm package	Low power High robustness: Immune to small molecular gasses LVCMOS: Drive multiple loads Stability: ±5 ppm
32.768 kHz TCXO SiT1532 32.768 kHz	900 nA typ. power consumption 1.2 V to 3.63 V operation 1.5 x 0.8 mm and 2.0 x 1.2 mm packages	Saves power, maximizes battery life Programmable output swing for further power savings Small footprint saves board space Internal VDD filtering eliminates external bypass capacitor: BOM cost reduction and further space savings

“Garmin makes products that are engineered on the inside for life on the outside. Our innovation focuses on developing technologies that enable our customers to enrich their experiences as they pursue their passions. SiTime’s MEMS timing solutions help extend battery life across several of our product lines.”

Patrick Desbois, Executive vice president of operations, Garmin