Home > ST Microelectronics develops high-stability real-time clock chip for smart utility meters and precision applications

ST Microelectronics develops high-stability real-time clock chip for smart utility meters and precision applications

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Leading global semiconductors specialist, ST Microelectronics has developed a temperature-compensated real-time clock chip for utility meters and other equipment including medical devices and industrial systems that require stable, precision timing.

Achieving record low power consumption, typically drawing only 0.8µA with fully operational temperature compensation, the M41TC8025 single-chip real-time clock helps reduce operating costs for electronic utility meters and can extend the lifetime of battery-powered equipment.

Temperature compensation guarantees accuracy to within 2.5 minutes per year (±5 ppm) over the entire specified temperature range from -40ºC to +85ºC, allowing precise time stamping and tariff switching in metering applications across seasons and in various climates.

ST’s M41TC8025 single-chip real-time clock also offers superior corrosion resistance, as tests with a lead customer have revealed. The customer, a producer of electronic utility meters for use outdoors in harsh environments such as coastal regions, performed corrosion testing and found that ST’s new single-chip real-time clock outperforms functionally equivalent devices, owing to its high-quality package design and materials.

The M41TC8025 generates accurate date and time information in seconds, minutes, hours, day-of-week, date (day of month), month and year, and helps simplify system design by providing extra integrated functions including an alarm, fixed-cycle timer, time-update interrupt, and programmable frequency outputs.

The device integrates a temperature-compensated 32768 Hz crystal oscillator as precision timing reference, which helps minimise component count and simplify system hardware design.

Key features of ST’s M41TC8025 single-chip real-time clock:

  • 0.8 μA typical current at 3.0V supply voltage
  • Guaranteed accuracy over temperature:
    • ±5.0 ppm max from -40 to 85ºC (c. 2.5 minutes per year)
    • ±3.8 ppm max from 0 to 50ºC (better than 2 minutes per year)
  • Embedded high-stability 32 KHz temperature-compensated crystal oscillator
  • Time-of-day alarm (with interrupt)
  • Fixed-cycle timer-interrupt function
  • Time-update interrupt function
  • Programmable frequency output (1 Hz, 1024 Hz and 32768 Hz)
  • 400kHz I2C interface

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