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RX8130CE: Real time clock module (I2C Bus) with built-in backup charging function
In daily use of intelligent products; The LCD display interface needs to display real-time time and working time, etc. Although the main control MCU has a built-in RTC unit, the accuracy cannot be achieved, and an external RTC module is needed. The Epson real-time clock module RX8130CE can not only easily achieve this function, but the key is its small size; Space saving and high cost-effectiveness. Below, everyone will introduce the detailed parameters and application scope of this RX8130CE.
·Built in 32.768 kHz crystal unit (frequency accuracy adjustment completed)
·Interface type: I2C Bus interface
·Working voltage range: 1.6V to 5.5V
·Temperature compensation voltage: 1.1V to 5.5V
·Timing (holding) voltage range: 300 nA (Typ.)/3 V
·Automatic power supply switching function: Switch to the main power supply monitoring
·Backup battery charging control function: Rechargeable lithium battery
·Delayed reset function: detecting main power supply and removing reset
·Different functions include full calendar, alarm, timer, etc
Circuit diagram
overview
·I2C Bus interface
·Power switching function
Detect VDD voltage and automatically switch to backup power supply of 1.25V (Min) for power supply
Even if the main power supply voltage decreases, the backup power supply will still be affected
·Rechargeable lithium battery charging control function
When fully charged is detected, it will automatically stop charging
The decrease in the detected backup power supply voltage is recorded in the register
·Delayed reset function
When the main power supply is powered on, the reset output is released, and the release voltage is selected by the register (2.80V/2.75V)
The delay time is 60ms (Typ), starting from the detection of voltage rise
·Frequency output function
The output function can be selected from 32.768KHz, 1024Hz, 1Hz
·Alarm function and timer function
Optional from 1/4096 seconds to 65535 hours
The original clock of the timer is 1 hour, 1 minute, 64Hz, 4096Hz
This function is automatically recorded to TF bit and can also be output through/IRQ pin when an event occurs
Specification (Features)
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