Epson RTC-4543SB, RTC-4543SA User Manual

MQ252-03

Application Manua

Real Time Clock Module

RTC-4543SA/SB

Model Product Number
RTC-4543SA Q4145435x000200

RTC-4543SB Q4145436x000200

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NOTICE

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RTC - 4543 SA/SB

CONTENTS

1. OVERVIEW

2. BLOCK DIAGRAM

3. PIN CONNECTIONS

4. PIN FUNCTIONS

........................................................................................................1

...........................................................................................1

.......................................................................................2

..............................................................................................2

5. ELECTRICAL CHARACTERISTICS

5-1. A

BSOLUTE MAXIMUM RATINGS ..........................................................................................3

5-2. O
5-3. F
5-4. DC C
5-5. AC C
5-6. T

6. TIMER DATA ORGANIZATION

7. DESCRIPTION OF OPERATION

7-1.D
7-2. D
7-3. D
7-4. FOUT

PERATING CONDITION.......................................................................................................3

REQUENCY CHARACTERISTICS........................................................................................3

HARACTERISTICS........................................................................................................3

HARACTERISTICS.........................................................................................................4

IMING CHARTS.....................................................................................................................5

..................................................................6

...............................................................7

ATA READS............................................................................................................................7

ATA WRITES.........................................................................................................................7

ATA WRITES (DIVIDER RESET).........................................................................................8

OUTPUT AND

1 H

Z CARRIES...................................................................................8

.........................................................3

8. EXAMPLES OF EXTERNAL CIRCUITS

9. EXTERNAL DIMENSIONS

.........................................................................10

10. LAYOUT OF PACKAGE MARKINGS

11. REFERENCE DATA

12. APPLICATION NOTES

12-1. N
12-2. N

OTES ON HANDLING.......................................................................................................12

OTES ON PACKAGING....................................................................................................12

...................................................................................11

..............................................................................12

.................................................9

..................................................10

RTC - 4543 SA/SB

32-kHz Output Serial RTC Module

RTC - 4543 SA/SB

Built-in crystal permits operation without requiring adjustment

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Built-in time counters (seconds, minutes, hours) and calendar counters (days, days of the week

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months, years)

Operating voltage range: 2.5 V to 5.5 V

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Supply voltage detection voltage: 1.7 ±0.3 V

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Low current consumption: 1.0 µA/2.0 V (Max.)

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Automatic processing for leap years

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Output selectable between 32.768 kHz/1 Hz

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1. Overview

This module is a real-time clock with a serial interface and a built-in crys t al oscillator. This module
is also equipped with clock and calendar circuits, an automatic leap year compensation function,
and a supply voltage detection function.
In addition, this module has a 32.768 kHz/1 Hz selectable output function for hardware control t hat
is independent of the RTC circuit.
This module is available in a compact SOP 14-pin package (RTC-4543SA) and a thin SOP 18-pin
package (RTC-4543SB).

2. Block diagram

32.768 kHz

OSC

FOUT
FSEL

FOE

DATA

CLK

WR
CE

OUTPUT

CONTROLLER

I / O

CONTROLLER

DIVIDER

CLOCK AND CALENDAR

SHIFT REGISTER

VOLTAGE
DETECT

CONTROL

CIRCUIT

Page - 1 MQ - 252 - 03

RTC - 4543 SA/SB

3. Pin Connections

RTC - 4543SB

N.C

1

910

18

18

17

N.C
N.C

16
15

N.C

14

DD

V
N.C

13
12

CLK

11

DATA
FOUT

10

SOP - 18pin

1
2

3
4
5
6
7

GND
N.C

CE
FSEL

WR
FOE
N.C

RTC - 4543SA

14

FOUT

1

78

14

13

N.C

N.C

12
11

DATA

CLK

10

9

V

DD

8

N.C

SOP - 14pin

2
3
4

8
9

1

5
6
7

N.C
N.C
N.C
N.C
FOE
WR
FSEL
CE
GND

4. Pin Functions

Pin No.

Signal

GND

CE

FSEL

WR

FOE

VDD

CLK

DATA

FOUT

SOP-14pin

(SOP-18pin)

1

( 9 )

3

( 8 )

4

( 7 )

5

( 6 )

6

( 5 )

9

( 14 )

10

( 12 )

11

( 11 )

14

( 10 )

2,7,8,12,13

N.C.

( 1,2,3,4,13,

15,16,17,18 )

* Always connect a passthrough capacitor of at least 0.1 µF as close as possible between VDD and GND.

I/O Function

Connects to negative (-) side (ground) of the power supply.

Chip enable input pin.

Input

When high,the chip is enabled. When low,the DATA pin goes to
high impedance and the CLK,DATA,and WR pins are not able to
accept input.In addition, when low,the TM bit is cleared.
Serect the frequency that is output from the FOUT pin.

Input

High : 1 Hz
Low : 32.768 kHz
DATA pin input/output switching pin.

Input

High : DATA input (when writing the RTC)
Low : DATA output (when reading the RTC)
When high, the frequency selected by the FSEL pin is output from

Input

the FOUT pin.
When low, the FOUT pin goes to high impedance.

Connects to positive (+) side of the power supply.

Serial clock input pin.

Input

Data is gotten at the rising edge during a write, and data is output
at the rising edge during a read.

Bi-directional Input/outout pin that is used for writing and reading data.

Outputs the frequency selected by the FSEL pin. 1 Hz output is

Output

synchronized with the internal one-second signal.
This output is not affected by the CE pin.
Although these pins are not connected internally,they should
always be left open in order to obtain the most stable oscillation
possible.

Page - 2 MQ - 252 - 03