Compact real time clocks for vehicles include DTCXO
Seiko Epson is shipping the RA8000CE and RA4000CE real time clock (RTC) modules which are designed for in-vehicle applications. Both additions to the company’s RTC portfolio have a built-in digital temperature-compensated crystal oscillator (DTCXO).
They are the company’s first RTC modules with a built-in DTCXO to support operating temperatures up to +125 degrees C and to be AEC-Q1003 compliant.
Automotive manufacturers require devices that comply with vehicle reliability test standards and the growing number of electronics and functions being added to vehicles is creating greater demand for automotive devices that operate on low current and in high temperature environments. Seiko Epson’s RTC modules are guaranteed to be compliant with AEC-Q100. The company says it meets customer needs by designing, developing and fabricating the ICs used in the modules.
The operating temperature range of the RA8000CE and RA4000CE is -40 to +125 degrees C, which exceeds the temperature range of Epson’s existing automotive RTC module, the RA8804CE. The number of time stamp records has been expanded to two and there is a reset output function has been added. This improves the safety of the customer’s system by detecting when the power supply falls below a certain threshold and outputting a reset signal to peripheral devices.
The RA8000CE and RA4000CE are available with either an I2C-Bus interface or an SPI-Bus interface.
The RTC modules are suitable for in-vehicle equipment such as battery management systems and automotive master clocks as well as for factory automation equipment that requires a device that operates in high-temperature environments.
