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Technical Note / White Paper

RX-8564LC (Low Current Consumption I2C-Bus Interface Real Time Clock Module)

  • Built in frequency adjusted 32.768kHz crystal unit.
  • Interface Type
    I2C-Bus Interface (400kHz)
  • Operating voltage range
    1.8V to 5.5V
  • Timekeeper voltage range
    1.0V to 5.5V / -20°C to +70°C
  • Low backup current
    275nA / 3.0V(Typ.)
  • 32.768kHz frequency output function
    C-MOS output With Control Pin
  • The various functions include full calendar, alarm, timer,
  • and power supply voltage monitoring function

Complies with EU RoHS directive.

RX-8564LC
RX-8564LC

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RoHSpdf

REACH pdf

Brief Sheet pdf

Application Manual
(ETM12E-04) pdf (729kB)

Design Support Data Download

IBIS Models

Block diagram

Block diagram

Overview

  • Interface Type
    • I2C-Bus Interface.(Hi-speed bus specifications 400kHz)
    • * I2C-Bus slave address : read A3h and write A2h
  • Low Timekeeper voltage range
    • 1.0V to 5.5V / Ta=-20° to +70°C
    • 1.1V to 5.5V / Ta=-40° to +85°C
  • 32.768 kHz frequency output function
    • CLKOUT pin output (C-MOS output ), CL=30pF
    • CLKOE pin enables output on/off control.
    • Output selectable
    • < 32.768kHz, 1024Hz, 32Hz, 1Hz >
  • The various interrupt function
    • Timer function can be set up between 1/4096second and 255minutes.
    • Alarm function can be set to any combination of day of week, hour, or minute.

Specifications *Refer to application manual for details.

Recommend Operating Conditions

Item Symbol Condition Min. Typ. Max. Unit
Power voltage VDD - 1.8 3.0 5.5 V
Clock voltage VCLK - VLOW 3.0 5.5 V
Operating temperature TOPR - -40 +25 +85 °C

Low voltage detection

Item Symbol Condition Min. Typ. Max. Unit
Low voltage detection VLOW Ta=-20°C to +70°C - 0.9 1.2V V
Ta=-40°C to +85°C - 0.9 1.3V V

Frequency characteristics

Item Symbol Condition Rating Unit
Frequency tolerance Δ f/f Ta=+25°C
VDD=3.0V		 5±23 * ×10-6

* Please ask for tighter tolerance. (Equivalent to ±1 minute of monthly deviation)

Current consumption characteristics

Ta=-40°C to +85°C

Item Symbol Conditions Min. Typ. Max. Unit
Current Consumption lBK fSCL=0Hz
CLKOE=GND
CLKOUT; output OFF(LOW)		 VDD=5V - 330 800 nA
VDD=3V - 275 700
l32k fSCL=0Hz
CLKOE=VDD
CLKOUT;32.768kHz output ON(Output=OPEN ; CL=0pF) 		VDD=5V - 2.5 3.4 µA
VDD=3V - 1.5 2.2

name

Pin function

Signal Name Input/Output Function
SCL Input Serial clock input pin.
SDA Bi-directional Data input and output pin.
CLKOUT Output 32.768kHz clock output pin with the output control function. (C-MOS)
CLKOE pin control the condition of CLKOUT with FE-bit, etc.
CLKOE pin
input		 FE
bit		 CLKOUT pin
output
HIGH 1 Output (C-MOS)
0 OFF (LOW)
LOW 1 OFF (LOW)
0 OFF (LOW)
CLKOE Input
/INT Output Interrupt output (N-ch open drain)
VDD - Connected to a positive power supply.
GND - Connected to a ground.

Terminal connection / External dimensions

Terminal connection External dimensions

(Unit: mm)

Stop using the glue
Any glue must never use it after soldering LC-package to a circuit board.
This product has glass on the back side of a package.
When glue invasions between circuit board side and glass side, then glass cracks by thermal expansion of glue.
In this case a crystal oscillation stops.Consider glue abolition or glue do not touch to LC-package

Footprint (Recommended)

footprint

(Unit: mm)

To maintain stable operation, provide a 0.1uF by-pass capacitor
at a location as near as possible to the power source terminal of the crystal product (between Vcc - GND).

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