According to the company, the 32.768kHz crystal unit allows customers to develop accurate timekeeping even under harsh environmental conditions, such as in outdoor meters.
The company also developed technology for detecting and correcting frequency deviations caused by temperature changes. The S7C17M11 is claimed to be accurate to within 10s per month at temperatures between 0°C and 50°C, 13.2s per month between -30°C and 70°C, and 26.4s per month between -40°C and 85°C.
The integrated, single-chip solution is said to eliminate the need for adjustments, thus reducing customers' development time and reducing the number of discrete components.
The S7C17M11 has a number of other integrated peripheral circuits, including flash memory, a 12bit AD converter, and an LCD driver with a built-in liquid crystal power supply for a 240-segment display. Power consumption in RTC mode is 2.25µA.
The device also features a power switching circuit; a sound generator; and built-in oscillator circuits, including 32.768kHz and 700kHz fixed-frequency circuits and a circuit that is switchable between 16MHz, 12MHz, 8MHz, and 4MHz.
The supply voltage detector circuit that does not require an external power supply supervisor and is accurate to ±2.5%. The solution has an IR remote controller and comes equipped with four types of serial interfaces: UART, SPI, I2C, and a smart card interface.
