Datasheet > RA-4574SA:B

RA-4574SA:B

更新时间： 2024-02-23 14:31:09

品牌	Logo	应用领域
精工 - SEIKO		时钟光电二极管外围集成电路
页数	文件大小	规格书
2页	262K
描述
REAL TIME CLOCK, PDSO14, SOP-14

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中文翻译

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RA-4574SA:B 数据手册

Real time clock module

Product Number (Please contact us)

RA-4574SA : Q41A47452xxxx00

REAL TIME CLOCK MODULE (SPI-Bus)

For Automotive

RA - 4574SA



Built in frequency adjusted 32.768 kHz crystal unit.

Interface Type

: 3-wire serial interface

: 1.6Vto5.5V

Operating voltage range

Wide Timekeeper voltage range : 1.6Vto5.5V

Low backup current

: 0.5A/3V(Typ.)

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

The various functions include full calendar, alarm, timer.

Applications : Car audio, Car navigation system, Clock, ECU sub clock

Conforms to AEC-Q200

Actual size

Block diagram

Overview

32.768 kHz

CONTROL LINE

32.768 kHz frequency output function

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

• Output frequency selectable from 1/30Hz to 32.768kHz(32 Values)

OSC

CLOCK and

CALENDAR

DIVIDER

Timer function

• Timer function can be set between 1/4096 second and 255 minutes.

• It is recorded automatically to TF-bit at the time of event

occurrence, and it’s possible to output with /TIRQ pin output

(open-drain output).

FOUT

FCON

OUTPUT

TIMER

CONTROLLER

• Selectable one time mode or repeat mode.

/ TIRQ

/ AIRQ

INTERRUPTS

CONTROLLER

ALARM

Alarm function

• Alarm function can be set to any combination of day of

week, hour, or minute.

• It is recorded automatically to AF-bit at the time of event

occurrence, and it’s possible to output with /AIRQ pin output

(open-drain output).

DATA

CLK

CONTROL

BUS

INTERFACE

CIRCUIT

CE 1

CE 0

SHIFT REGISTER

Pin Function

Terminal connection/External dimensions (Unit:mm)

RA4574SA

Signal Name Input / Output

Function

The chip enabled input pin 0. (Built-in pull-down resistance)

When both CE0 and CE1 pins are at the “H” level , access to this

Real time clock module becomes possible.

The chip enabled input pin 1.

When the CE1 pin is at the HIGH level, the FOUT pin is in the output state.

1. GND

2. FOUT

3. N.C.

4. N.C.

5. N.C.

6. N.C.

7. VDD

14. FCON

13. CE1

12. DATA

11. CLK

CE0

CE1

Input

CLK

Input

Bi-directional

Output

The shift clock input pin for serial data transfer.

DATA

The data input / output pin for serial data transfer.

5.0

This pin outputs the reference clock signal at 32.768 kHz ( C-MOS output ).

High impedance at the time of output off.

10.

/TIRQ

/AIRQ

FOUT

FCON

/ AIRQ

/ TIRQ

VDD

Input

The input pin for the FOUT output control.

The open drain output pin for alarm and time update interrupts.

The open drain output pin for timer interrupt.

Connected to a positive power supply.

Output

7.40.2

8. CE0

SOP14 pin

The metal case inside of the molding compound may be exposed on the top or

bottom of this product. This purely cosmetic and does not have any effect on

quality, reliability or electrical specs.

GND

Connected to a ground.

Specifications (characteristics)

 Refer to application manual for details.

 Recommended Operating Conditions

 Current consumption characteristics

Ta=-40Cto+85C

Item

Symbol

Conditions

Min.

Typ.

Max.

Unit

Item

Symbol

Conditions

Min. Typ. Max. Unit

Power voltage

Clock voltage

Operating

VDD

VCLK

1.6

3.0

5.5



VDD

=5V



1.0

0.5

2.0

1.0

CE0,CE1=GND

TOPR

-40

+25

+85

°C

IBK

µA

temperature

FOUT;Output OFF

(Hi-z)

VDD

=3V



 Frequency characteristics

Current

Consumption

Item

Symbol

Conditions

Rating

Unit

VDD

=5V



CE0=GND

CE1=VDD

8.0 20.0

5.0 12.0

Ta=+25°C

VDD=3.0V

Frequency

tolerance

f/f

10^



B: 523

3Max.

I32k

FOUT;

32.768kHz output ON

CL=30pF

VDD

=3V



Ta=+25°C

VDD=1.6V

Oscillation

start-up time

tSTA

 Equivalent to 1 minute of monthly deviation

中文翻译

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