RX8804CE :I2C-Bus Interface Real Time Clock Module
(Built-in 32.768 kHz-DTCXO)

* The I2C-BUS is a trademark of NXP Semiconductors.

PB Free

Complies with EU RoHS directive.

RX8804CE
RX8804CE

Block diagram

Block diagram

Overview

  • Stability
    • XA
      ± 3.4 x 10-6 / -40 °C to +85 °C ( Equivalent to ±9 seconds of month deviation )
      ± 8.0 x 10-6 / +85 °C to +105 °C ( Equivalent to ±21 seconds of month deviation )
    • XB
      ± 5.0 x 10-6 / -40 °C to +85 °C ( Equivalent to ±13 seconds of month deviation )
      ± 8.0 x 10-6 / +85 °C to +105 °C ( Equivalent to ±21 seconds of month deviation )
  • 32.768 kHz frequency output function
    • FOUT pin output (C-MOS output), CL = 30 pF
    • Output selectable: 32.768 kHz, 1024 Hz, 1 Hz
  • Event detection function
    • when trigger input to EVIN-pin or specified by program, time and date is recorded.
      The EVIN-pin with pull-up resistor that is releasable.
  • Timer function
    • Timer source clock are 1min., 1sec., 64Hz, 4096Hz.
    • 24-bit-presettable counter (244µs to about 32years(280320h).
  • Alarm function
    • Alarm function can be set to day of week, day, hour, and minute.
  • Internal state output function
    • SOUT pin output (C-MOS output).
    • it outputs selected flag-bit value or specified value(H or L).

Specifications (characteristics)

Electrical Characteristics

Item Symbol Conditions Min. Typ. Max. Unit
Operating voltage VDD Interface voltage 1.6 3.0 5.5 V
Temp. compensated Voltage VTEM Temp. compensated voltage 1.5 3.0 5.5 V
Clock supply voltage VCLK Internal clock 1.5 3.0 5.5 V
Operating temperature TOPR No condensation -40 +25 +105 °C
Stability Δ f/f XA Ta = -40 °C to +85 °C ± 3.4  *1 x10-6
Ta = +85 °C to +105 °C ± 8.0  *2
XB Ta = -40 °C to +85 °C ± 5.0  *3
Ta = +85 °C to +105 °C ± 8.0  *2
Current consumption(1) lDD1 fSCL = 0Hz , /INT = VDD
FOE = GND
FOUT:OFF
Temp.Compensation
interval 2.0 s.
VDD=5V - 0.4 1.6 µA
Current consumption(2) lDD2 VDD=3V - 0.35 1.5

*1 Equivalent to ±9 seconds of month deviation.
*2 Equivalent to ±21 seconds of month deviation.
*3 Equivalent to ±13 seconds of month deviation.

32.768 kHz-DTCXO Frequency temperature characteristics (Example)

name

Pin function

Signal Name I / O Function
SOUT Output Internal state output pin./td>
SCL Input Serial clock input pin
FOUT Output The pin outputs the reference clock signal
( CMOS output )
EVIN Input Event input pin
VDD - Connected to a positive power supply
FOE Input The input pin for the FOUT output control
/ INT Output Interrupt output (N-ch. open drain)
GND - Connected to a ground
T2 - Use only for testing in the factory
( Do not connect externally )
SDA I/O Data input and output pin

Terminal connection/External dimensions

Terminal connection External dimensions

(Unit: mm)

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).

Video contents: How to use Real Time Clock Module evaluation board(RX8900CE, RX8804CE)

Video contents: RX8111CE: Battery backup switchover function

Video contents: RX8111CE: Time stamp function

Video contents: RX8111CE: Wake up timer function

Video contents: RX4111CE: Battery backup switchover function

Video contents: RX8804CE, RA8804CE SOUT Function

Real Time Clock: RX8900CE / RX8804CE Evaluation Tools

Linux® Driver for Real Time Clock Module

The registered trademark Linux® is used pursuant to a sublicense from LMI (Linux Mark Institute)

Product Brief/White Paper/Technical Note

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