GENEVA July 26, 2011
The M41T62 is ideally suited to the needs of battery-powered designs. By operating at low voltages from 1.3V to 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 subsystems 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 synchronization. These can be found in SLR digital cameras, GPS receivers, portable multimedia players, card readers, portable medical monitors such as glucose meters.
Major features of the M41T62
- 3.2 x 1.5mm lead-free ceramic package
- RTC and crystal within industry’s smallest crystal-only outline
- Ultra-low power consumption of 350nA @ 3 V
- Low operating voltage: 1.3V – 4.4V
- Provides stable 32kHz on power-up
- Oscillator failure detection ensuring safe operation
- Timekeeping down to 1.0V
- Programmable alarm and watchdog
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