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Real-time clock touts small 3.2x1.5mm size

Posted: 29 Jul 2011     Print Version  Bookmark and Share

Keywords:rtc  crystal  real time  clock 

STMicroelectronics debuts the M41T62, a small combined crystal and real-time clock (RTC) IC that claims to be the smallest crystal-only device to combine the smallest real-time clock die and a matched oscillator crystal in a 3.2x1.5mm package size targeted at time, calendar and alarm functions.

The M41T62 is aimed at battery-powered designs. By operating at low voltages from 1.3–4.4V, it can be driven directly from a Li-ion battery and draws only 350nA. Many integrated microcontrollers have an on-chip RTC, but these often provide limited features and an external crystal is always required. Unlike designing with microcontrollers, or discrete solutions, this integrated solution takes care of the required and sometimes troublesome matching of the crystal and the RTC.

The M41T62 also simplifies product design. It produces a stable 32kHz signal on start-up, which ensures reliable starting from many of today's processors and sub-systems such as Bluetooth modules. Additional features enhancing design and system performance include oscillator failure detection (OFD), which helps the system detect power faults. Actions such as power-down time stamping, low-battery detection can be done without the additional external components needed by a microcontroller RTC. The device is also UL certified and has a built-in reverse diode.

The M41T62 improves the performance of systems whose functions rely on data logging, time stamping, interval monitoring or synchronisation. These can be found in SLR digital cameras, GPS receivers, portable multimedia players, card readers, portable medical monitors such as glucose meters.

The M41T62 is entering into volume production now in the LCC8 leadless package, priced at approximately Rs.66.96 ($1.50) in quantities of 1000 units. Alternative pricing options are available for larger order quantities.





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