rx-8731lc Epson Electronics America, Inc., rx-8731lc Datasheet

rx-8731lc

Manufacturer Part Number

rx-8731lc

Description

Built-in Eeprom And Unique Id-rom 2 I2c-bus Interface Real Time Clock Module

Manufacturer

Epson Electronics America, Inc.

Datasheet

1.RX-8731LC.pdf (1 pages)

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Signal Name Input / Output

! ! ! !

Power voltage

Clock voltage

Operating

! ! ! !

Frequency

Oscillation

Built-in EEPROM and Unique ID-ROM

RX - 8731 LC

*Equivalent to 1 minute of monthly deviation

temperature

tolerance

Start-up time

* The I

FOUT

/ IRQ

C-Bus INTERFACE REAL TIME CLOCK MODULE

Pin Function

GND

Specifications (characteristics)

SCL

SDA

FOE

P00

P01

P02

P03

Built in frequency adjusted 32.768 kHz crystal unit.

Interface Type

Operating voltage range

Wide Timekeeper voltage range : 1.3 V to 5.5 V

Low backup current

32.768 kHz frequency output function : C-MOS output With Control Pin

The various functions include full calendar, alarm, timer.

A 0

Frequency characteristics

Block diagram

Recommended Operating Conditions

Real time clock module

P00 – P03

Item

SDA

SCL

FOE

FOUT

/ IRQ

A 0

C-Bus is a trademark of NXP Semiconductors

Bi-directional

Output

Input

Symbol

STA

OPR

CLK

f / f

32.768 kHz

OSC

Serial Clock input pin.

Data input and output pin.

Device address A0 input pin.

FOUT pin is 32.768 kHz clock output pin ( C-MOS ) that output control is

possible.

FOE pin control the frequency output from FOUT pin with FSEL1-bit and

FSEL0-bit.

Interrupt output pin. ( N-ch open drain )

Programmable I/O ports.

Connected to a positive power supply.

Connected to a ground.

= +25 C

= -40 C to +85 C

Condition

= 3.0 V

= 1.6 V

INTERRUPTS

Condition

CONTROLLER

INTERFACE

FOUT

CIRCUIT

C-Bus

DIVIDER

I/O Port

: I

: 1.7 V to 5.5 V

: 0.35 A / 3 V (Typ.)

C-Bus interface (400 kHz)

Min.

1.7

1.3

-40

10 Byte ( 80 bit )

6 Byte ( 48 bit )

EEPROM

ID-ROM

Typ.

+25

3.0

Function

1 Max.

3 Max.

Rating

5 23 *

http://www.epsontoyocom.co.jp

TIMER REGISTER

ALARM REGISTER

CLOCK

CALENDAR

SYSTEM

CONTROL

and

CONTROLLER

Max.

+85

5.5

Unit

Actual size

! ! ! !

Current

Consumption

Current consumption characteristics

Item

The various interrupt function

Built in EEPROM and ID-ROM

Programmable I/O ports

32.768 kHz frequency output function

Interface Type

Overview

Symbol

• Built in 10 Byte ( 80 bit) EEPROM

• Built in 6 Byte ( 48 bit ) ID-ROM

• 4 Programmable I/O ports

• I

• FOUT pin output (C-MOS output), CL=30 pF

• FOE pin enables output on/off control.

• Output frequency is selectable.

• Alarm interrupt function

• Timer interrupt function

• Update interrupt function

32k

< 32.768 kHz, 1024 Hz, 1 Hz >

C-Bus high-speed bus specifications. (400 kHz)

Terminal connection / External dimensions

/ IRQ = OFF

FOUT : output OFF

/ IRQ = OFF

FOUT :

CL = 30 pF

SCL

32.768 kHz output

= 0 Hz

1. FOE

2. P00

3. SDA

4. SCL

5. A 0

6. GND

( Hi - z )

Condition

Refer to application manual for details.

VSOJ 12pin

Epson Toyocom

= 5 V

= 3 V

= 5 V

= 3 V

8731 LC

2.8

2.4

Min.

Typ.

0.45

0.35

12. V

10. P02

8.0

5.0

11. P01

9. P03

8. / IRQ

7. FOUT

= 40 C to +70 C

Max.

16.0

10.0

0.9

0.7

(Unit:mm)

Unit

µA

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