Epson RX-8130CE with built-in battery control RTC

Apr 22,2024
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Features:

(1) Minimal packaging and high integration

RX-8130CE is a real-time clock module with a | 2C interface, which integrates a 32.768KHz crystal oscillator internally. The real-time clock function not only integrates calendar and clock counters for year, month, day, week, hour, minute, and second, but also has functions such as time alarms, interval timers, and time update interrupts. The RTC chip has a backup battery charging control function and power input pins, which can support various power circuits. All these functions are implemented in a 3.2mm X2.5mm X1.0mm (3225) ceramic package, perfect for smartwatches.

(2) Accurate timing and ultra-low power consumption

The 32.768KHz crystal integrated with RX-8130CE has been calibrated for each RTC before leaving the factory, with a monthly time error of no more than 1 minute, greatly maintaining product consistency. Simultaneously integrated with an I2C bus with a maximum speed of up to 400kbps, the ultra wide operating voltage ranges from 1.1V to 5.5V. The minimum current consumption is 300nA, and the leakage current of VBAT pin is only 5nA! Very suitable for various wearable devices powered by batteries.

(3) Powerful timer and rich auxiliary functions

The powerful timer function is also an advantage of RX-8130CE. The timer's timing time can be set from 1/4096 seconds to 65535 hours, and the clock source of the timer can be selected from 1 hour, 1 minute, 64Hz, and 4096Hz. Timer events will be recorded in the TF register or notified to the host through the IRQ pin output. At the same time, the RX-8130CE supports frequency output function, and the Fout pin can output frequencies of 32.768KHz, 1024Hz, and 1Hz.

Specifications (characteristics)

Overview

I²C-Bus interface.
Auto power switching function
- The VDD voltage is monitored and it switches to the backup power supply by the automatic operation. The switch voltage to the backup power supply. 1.25V (Min.)
- Even if the main power supply voltage is decreased, the current flow from the backup power supply is prevented.
Charge control function for the rechargeable lithium batteries.
- Stop charging automatically by detecting the full charge.
- Records in the register detecting the backup power supply voltage decrease.
Reset function with a delay
- When the main power is supplied, reset output is released.The release voltage is selected by the register. (2.80V / 2.75V)
- Delay time from the voltage rise detection is 60ms Typ.
Frequency output function
- Output frequency is selectable from 32.768kHz, 1024Hz,1Hz.
Timer function
- Selectable in 1/4096 second from 65535 hours.
- Timer source clock are 1hour, 1min, 64Hz, 4096Hz.
- It is automatically recorded to TF-bit at the time of event occurrence, and possible to output with /IRQ pin.