Real time clock module RA8900CE complies with AEC-Q200 vehicle specification standards

With the rise of new energy vehicles, automotive electronic products have also developed rapidly. The working conditions of automotive electronic products are very complex, so the requirements for the components used are very high. In addition to requiring high environmental weather resistance, it is also necessary for relevant characteristic parameters to have small fluctuations in harsh environments to ensure overall operational stability. EPSON's real-time clock module RA8900CE integrates numerous functional modules using advanced technology, such as I2C bus interface, automatic power switching, etc., which can demonstrate excellent performance in different complex working conditions.

Electronic products used in automobiles must meet the AEC-Q200 automotive standard. Due to the strict application scenarios of automotive products, the AEC-Q200 automotive standard has higher requirements compared to general standards. For example, temperature cycling, thermal stress, dimensional stability, terminal strength, solvent resistance, impact resistance, vibration resistance, weldability, flammability, and ESD. The RA8900CE meets the requirements of AEC-Q200 certification while meeting the existing accuracy characteristics, making it more adaptable to various complex and demanding working environments.

The RA8900CE is equipped with a 32.768kHz DTCXO (digital temperature compensated crystal oscillator), which has a time accuracy of ± 3.4 ppm (equivalent to ± 9 seconds of error per month) in the temperature range of -40 ° C to+85 ° C, meeting the AEC-Q200 vehicle specification standard. This high-precision performance enables it to provide stable time service even in extreme environments. The working current is extremely low, with a typical value of only 0.7uA (at 3V). The RA8900CE uses an I2C interface, supports communication rates up to 400kHz, and has automatic power switching function. When the main power supply voltage drops, the module can automatically switch to the backup power supply to ensure the continuous operation of the system.

For electronic products, in order to cope with abnormal fluctuations or disconnections of the main power supply, a backup power supply is usually set up at the same time to ensure that the system can continue to operate necessary in the event of an abnormal main power supply. However, traditional real-time clock circuits do not have this type of power management function, and additional circuits of this type need to be added to the circuit. The RA8900CE adopts advanced C-MOS technology and has built-in main and backup power management function modules, which can achieve seamless automatic switching between main and backup power without the need for additional external devices. Moreover, only a rechargeable energy storage device needs to be externally connected to the VBAT pin as a backup power supply, which can also achieve backup power charging and discharging management, and the above functions can be flexibly configured through the I2C communication interface. The use of RA8900CE can significantly reduce product volume and decrease power complexity.