ETM09E-03
Application Manua
l
Real Time Clock Module
RTC-4543SA/SB
Preliminary
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NOTICE
This material is subject to change without notice.
Any part of this material may not be reproduced or duplicated in any form or any means without the
written permission of Seiko Epson.
The information about applied circuitry, software, usage, etc. written in this material is intended for
reference only. Seiko Epson does not assume any liability for the occurrence of infringing on any
patent or copyright of a third party. This material does not authorize the licensing for any patent or
intellectual copyrights.
When exporting the products or technology described in this material, you should comply with the
applicable export control laws and regulations and follow the procedures required by such laws and
regulations.
You are requested not to use the products (and any technical information furnished, if any) for the
development and/or manufacture of weapon of mass destruction or for other military purposes. You
are also requested that you would not make the products available to any third party who may use the
products for such prohibited purposes.
These products are intended for general use in electronic equipment. When using them in specific
applications that require extremely high reliability, such as the applications stated below, you must
obtain permission from Seiko Epson in advance.
/ Space equipment (artificial satellites, rockets, etc.) / Transportation vehicles and related
(automobiles, aircraft, trains, vessels, etc.) / Medical instruments to sustain life /
Submarine transmitters / Power stations and related / Fire work equipment and security
equipment / traffic control equipment / and others requiring equivalent reliability.
All brands or product names mentioned herein are trademarks and/or registered trademarks of their
respective.
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RTC - 4543 SA/SB
CONTENTS
1. OVERVIEW
........................................................................................................ 1
2. BLOCK DIAGRAM
........................................................................................... 1
3. PIN CONNECTIONS
...................................................................................... 2
4. PIN FUNCTIONS
............................................................................................. 2
5. ELECTRICAL CHARACTERISTICS
......................................................... 3
5-1. A
BSOLUTE
M
AXIMUM
R
ATINGS .......................................................................................... 3
5-2. O
PERATING
C
ONDITION ....................................................................................................... 3
5-3. F
REQUENCY
C
HARACTERISTICS ........................................................................................ 3
5-4. DC C
HARACTERISTICS ........................................................................................................ 3
5-5. AC C
HARACTERISTICS ......................................................................................................... 4
5-6. T
IMING
C
HARTS ..................................................................................................................... 5
6. TIMER DATA ORGANIZATION
.................................................................. 6
7. DESCRIPTION OF OPERATION
.............................................................. 7
7-1.D
ATA READS............................................................................................................................ 7
7-2. D
ATA WRITES ......................................................................................................................... 7
7-3. D
ATA WRITES
(D
IVIDER
R
ESET
)
........................................................................................ 8
7-4. FOUT
OUTPUT AND
1 H
Z CARRIES ................................................................................... 8
8. EXAMPLES OF EXTERNAL CIRCUITS
................................................. 9
9. EXTERNAL DIMENSIONS
......................................................................... 10
10. LAYOUT OF PACKAGE MARKINGS
.................................................. 10
11. REFERENCE DATA
................................................................................... 11
12. APPLICATION NOTES
............................................................................. 12
ETM09E-03
RTC - 4543 SA/SB
32-kHz Output Serial RTC Module
RTC - 4543 SA/SB
Built-in crystal permits operation without requiring adjustment
Built-in time counters (seconds, minutes, hours) and calendar counters (days, days of the week
months, years)
Operating voltage range: 2.5 V to 5.5 V
Supply voltage detection voltage: 1.7
±0.3
V
Low current consumption: 1.0
µA/2.0
V (Max.)
Automatic processing for leap years
Output selectable between 32.768 kHz/1 Hz
1. Overview
This module is a real-time clock with a serial interface and a built-in crystal 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 that
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
DIVIDER
CLOCK
AND
CALENDAR
FOUT
FSEL
FOE
OUTPUT
CONTROLLER
SHIFT REGISTER
VOLTAGE
DATA
C
L
K
WR
CE
I/O
CONTROLLER
DETECT
CONTROL
CIRCUIT
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1
RTC - 4543 SA/SB
3. Pin Connections
RTC - 4543SA
1 GND
2 N.C
3 CE
4 FSEL
5 WR
6 FOE
7 N.C
7
8
RTC - 4543SB
14 FOUT
13 N.C
12 N.C
11 DATA
10 CLK
9 V
DD
8 N.C
1
2
3
4
5
6
7
8
9
N.C
N.C
N.C
N.C
FOE
WR
FSEL
CE
GND
1
18
1
14
9
10
18
17
16
15
14
13
12
11
10
N.C
N.C
N.C
N.C
V
DD
N.C
CLK
DATA
FOUT
SOP - 14pin
SOP - 18pin
4. Pin Functions
Pin No.
Signal
GND
SOP-14pin
(SOP-18pin)
I/O
Function
Connects to negative (-) side (ground) of the power supply.
Chip enable input pin.
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.
High : 1 Hz
Low : 32.768 kHz
DATA pin input/output switching pin.
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
the FOUT pin.
When low, the FOUT pin goes to high impedance.
Connects to positive (+) side of the power supply.
1
(9)
3
(8)
4
(7)
5
(6)
6
(5)
9
( 14 )
10
( 12 )
11
( 11 )
14
( 10 )
2,7,8,12,13
( 1,2,3,4,13,
15,16,17,18 )
Input
Input
CE
FSEL
Input
WR
Input
FOE
V
DD
CLK
DATA
FOUT
Input
Serial clock input pin.
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.
Output
Outputs the frequency selected by the FSEL pin. 1 Hz output is
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.
N.C.
* Always connect a passthrough capacitor of at least 0.1
µF
as close as possible between V
DD
and GND.
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