Many applications require date and time generation, and STMicroelectronics' real-time clocks (RTCs) provide those functions. RTCs can be implemented in software and in ASIC logic, but maintaining the clock can present added power management challenges. While low-power microcontrollers and ASICs are available, the devices still draw much more current than a dedicated RTC, and often cannot operate over a wide voltage range. A better solution is ST's M41T6x family of serial RTCs. These devices lead the way with low-current and low-voltage operation and come in a tiny QFN package. The M41T66 is the latest addition to the family. It is a serial access real-time clock with programmable alarm IRQ, 12pF crystal support, square wave and 32 KHz open-drain output for handheld and battery-operated systems and capacitor backup.
| Features |
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Applications |
- Counters for tenths/hundredths of seconds (excluding M41T60), seconds, minutes, hours, day date, month, year, and century
- 32 KHz crystal oscillator integrating load capacitance and high crystal series resistance operation
- Oscillator stop detection monitors clock operation
- 1.3 V to 4.4 V I2C bus operating voltage
- 12.5 pF crystal support
- Timekeeping down to 1.0 V
- 350 nA timekeeping current at 3 V, 525 nA at 3 V (M41T66)
- Tiny 3 x 3 QFN16 package
- M41T6x family of five RTCs to cover every application
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- Battery powered applications requiring timestamp or time display
- Long shelf-life products requiring lowest current drain
- STB, printer
- Glucose meter, patient monitor and medicine dispenser
- Inventory management and handheld scanners
- Handheld meters/testers
- GPS, handheld digital radio
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Many applications require date and time generation, and STMicroelectronics' real-time clocks (RTCs) provide those functions. RTCs can be implemented in software and in ASIC logic, but maintaining the clock can present added power management challenges. While low-power microcontrollers and ASICs are available, the devices still draw much more current than a dedicated RTC, and often cannot operate over a wide voltage range. A better solution is ST's M41T6x family of serial RTCs. These devices lead the way with low-current and low-voltage operation and come in a tiny QFN package. The M41T66 is the latest addition to the family. It is a serial access real-time clock with programmable alarm IRQ, 12pF crystal support, square wave and 32 KHz open-drain output for handheld and battery-operated systems and capacitor backup.
