RX8130CE provides users with a solution with reset delay and primary/backup power management

Apr 12,2024
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As the precise clock source for devices, real-time clocks play a role similar to the human heart, providing accurate and stable heartbeat for devices. However, portable devices have relatively high requirements for internal components due to their diverse application scenarios, which poses many challenges for real-time clock modules as core components. The EPSON real-time clock module product line of the has a wide range of optional products that can be adapted to different application fields and scenarios. Among them, RX8130CE, as one of the representative products, has received widespread praise in the industry. This product is a real-time clock module that can operate in an ultra wide voltage range of 1.25~5.5V, with a minimum static power consumption as low as 300nA at 3V.

RX8130CE integrates I2C communication interface, supporting users to flexibly configure rich internal registers through the interface to better meet different user application scenarios. This includes calendar clock configuration items, wake-up timing configuration items, alarm configuration items, low-voltage monitoring configuration items, etc. Moreover, a 32bit RAM register space has been allocated and stored by users to meet their personalized needs to the greatest extent possible. For example, in compact portable devices such as wearable devices, these features can be utilized to flexibly configure according to the needs of each user, which can more accurately meet the actual needs of each user.

The RX8130CE also has a very useful feature, which is the management of the main and backup power sources and the charging control of the backup battery. When a device is running, it may sometimes experience power instability due to uncertain external factors. In order to ensure the stable operation of the system, there must be a primary and backup power management. This is particularly important for the real-time clock module as the heart of the device. If an external power management circuit is specially equipped for it, not only will the circuit volume increase and power consumption increase, but it will also add a lot of additional costs. The RX8130CE has this built-in function, which enables the real-time clock module to provide a stable and continuous clock source for the system, reducing load and increasing stability. Moreover, the RX8130CE also comes with a built-in backup battery charging management function. Users only need to directly connect to the VBAT pin and configure relevant registers to obtain a stable and efficient backup power supply by using only one inexpensive EDLC device. This is very suitable for applications such as driving recorders that require both backup power supply and very high cost requirements. Compared to previous solutions, it reduces the number of devices by at least one-third, significantly reducing overall volume and cost.

It is also worth mentioning the configurable delay reset function of RX8130CE. This function can achieve a similar power on/off voltage monitoring function. By connecting to the reset pin of the MCU, it can prevent the MCU from working in an abnormal state due to the system power supply being too slow during the power on/off process. For portable devices, there may be repeated power on and off operations, which can easily cause abnormalities during the power on and off process. This requires this power on and off voltage monitoring function to enhance system robustness. By integrating this functional module, RX8130CE can further reduce the use of peripheral devices and improve overall efficiency for users. This function can also be adjusted through internal register values, which can adapt to MCUs with different operating voltage ranges and meet more application scenarios, such as wearable products powered by small lithium batteries, intelligent controllers powered by button batteries, etc.