MQ252-03
Application Manual
Real Time Clock Module
RTC-4543SA/SB
Model
Product Number
RTC-4543SA
RTC-4543SB
Q4145435x000200
Q4145436x000200
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. ABSOLUTE MAXIMUM RATINGS ..........................................................................................3
5-2. OPERATING CONDITION.......................................................................................................3
5-3. FREQUENCY CHARACTERISTICS........................................................................................3
5-4. DC CHARACTERISTICS ........................................................................................................3
5-5. AC CHARACTERISTICS.........................................................................................................4
5-6. TIMING CHARTS.....................................................................................................................5
6. TIMER DATA ORGANIZATION..................................................................6
7. DESCRIPTION OF OPERATION...............................................................7
7-1.DATA READS............................................................................................................................7
7-2. DATA WRITES.........................................................................................................................7
7-3. DATA WRITES (DIVIDER RESET).........................................................................................8
7-4. FOUT OUTPUT AND 1 HZ 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
12-1. NOTES ON HANDLING.......................................................................................................12
12-2. NOTES ON PACKAGING ....................................................................................................12
RTC - 4543 SA/SB
32-kHz Output Serial RTC Module
RTC - 4543 SA/SB
zꢀ Built-in crystal permits operation without requiring adjustment
zꢀ Built-in time counters (seconds, minutes, hours) and calendar counters (days, days of the week
months, years)
zꢀ Operating voltage range: 2.5 V to 5.5 V
zꢀ Supply voltage detection voltage: 1.7 ±0.3 V
zꢀ Low current consumption: 1.0 µA/2.0 V (Max.)
zꢀ Automatic processing for leap years
zꢀ 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
CLOCK AND CALENDAR
DIVIDER
OSC
FOUT
FSEL
OUTPUT
CONTROLLER
SHIFT REGISTER
FOE
VOLTAGE
DETECT
DATA
CLK
WR
I / O
CONTROL
CIRCUIT
CONTROLLER
CE
Page - 1
MQ - 252 - 03
RTC - 4543 SA/SB
3. Pin Connections
RTC - 4543SA
RTC - 4543SB
14 FOUT
1
2
GND
N.C
1 N.C
2 N.C
3 N.C
18 N.C
17 N.C
1
18
1
14
13
N.C
N.C
16
15
N.C
12
11 DATA
CLK
3
4
5
CE
N.C
4
N.C
FSEL
WR
5 FOE
6 WR
14 VDD
13 N.C
10
7
12 CLK
11 DATA
10 FOUT
FSEL
7
8
9 VDD
8 N.C
6 FOE
7 N.C
9
10
8 CE
9 GND
SOP - 14pin
SOP - 18pin
Function
4. Pin Functions
Pin No.
SOP-14pin
Signal
I/O
(SOP-18pin)
1
( 9 )
GND
Connects to negative (-) side (ground) of the power supply.
Chip enable input pin.
3
( 8 )
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.
Input
CE
FSEL
WR
4
( 7 )
Input
Input
Input
5
( 6 )
6
( 5 )
FOE
When low, the FOUT pin goes to high impedance.
9
V
DD
Connects to positive (+) side of the power supply.
( 14 )
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.
10
( 12 )
CLK
Input
11
( 11 )
DATA
FOUT
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
14
( 10 )
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.
2,7,8,12,13
( 1,2,3,4,13,
15,16,17,18 )
N.C.
* Always connect a passthrough capacitor of at least 0.1 µF as close as possible between V and GND.
DD
Page - 2
MQ - 252 - 03
RTC - 4543 SA/SB
Page - 3
MQ - 252 - 03
RTC - 4543 SA/SB
5-5. AC Characteristics
Item
Unless specified otherwise: Ta = - 40 to +85 °C, CL = 50 pF
Symbol
Unit
V =5 V ± 10 %
DD
V =3 V ± 10 %
DD
Min.
Max.
Min.
Max.
CLK clock cycle
t
0.75
7800
3900
1.5
7800
3900
CLK
µs
µs
CLK low pulse width
CLK high pulse width
CLK setup time
t
0.375
0.75
CLKL
t
0.375
25
3900
3900
0.9
0.75
50
3900
3900
0.9
CLKH
µs
ns
t
CLKS
CE setup time
t
t
0.375
0.375
0.75
0.75
CES
CEH
µs
µs
s
CE hold time
CE enable time
t
t
CE
SD
HD
Write data setup time
Write data hold time
WR setup time
0.1
0.1
0.2
0.1
µs
µs
ns
ns
t
t
100
100
100
100
WRS
WR hold time
t
WRH
DATA output delay time
DATA output floating time
Clock input rise time
Clock input fall time
FOUT rise time (CL=30 pF)
FOUT fall time (CL=30 pF)
t
0.2
0.1
50
0.4
0.2
DATD
µs
µs
ns
ns
ns
ns
ns
ns
%
t
DZ
t
100
100
200
200
200
200
60
r1
f1
r2
f2
t
50
t
t
100
100
100
100
60
Disable time
Enable time
(CL=30 pF)
(CL=30 pF)
t
t
XZ
ZX
FOUT duty ratio (CL=30 pF)
Wait time
Duty
40
40
t
0.95
1.9
RCV
µs
Page - 4
MQ - 252 - 03
RTC - 4543 SA/SB
5-6. Timing Charts
( 1 ) Data read
tCE
WR
CE
tWRS
tWRH
tCES tCLK
tCEH
tRCV
CLK
tCLKH
tCLKL
tDZ
tCLKS
tr1 tf1
DATA
tDATD
( 2 ) Data write
t
CE
WR
CE
t
t
WRH
WRS
t
t
CEH RCV
t
t
CLK
CES
CLK
t
t
CLKL
CLKH
t
t
t
f1
r1
CLKS
t
HD
t
SD
DATA
( 3 ) FOUT output
FOUT
tH
tf2
90%
50%
10%
tr2
t
t
H
=
×
Duty
100 %
[ ]
t
( 4 ) Disable/enable
FOE
VIH
Enable
Disable
VIL
tXZ
tZX
High impedance
FOUT
Page - 5
MQ - 252 - 03
RTC - 4543 SA/SB
6. Timer Data Organization
• The counter data is BCD code.
• The timer automatically adjusts for different month lengths and for leap year.
• The time is indicated in 24-hour format.
• Writes and reads are both performed on an LSB-first basis.
MSB
LSB
s1
Second
( 0 to 59 )
FDT
s40
mi40
*
s20
mi20
h20
s10
mi10
h10
s8
s4
s2
Minutes
( 0 to 59 )
*
*
mi8
mi4
mi2
mi1
Hour ( 0 to 23 )
h8
*
h4
h2
h1
Day of the week
( 1 to 7 )
w4
w2
w1
Day ( 1 to 31 )
Month ( 1 to 12 )
Year ( 0 to 99 )
*
*
*
d20
*
d10
mo10
y10
d8
mo8
y8
d4
mo4
y4
d2
mo2
y2
d1
mo1
y1
TM
y80
y40
y20
* bits: Any data may be written to these bits.
• FDT bit: Supply voltage detection bit
• This bit is set to “1” when voltage of 1.7 ±0.3 V or less is detected between VDD and GND.
• The FDT bit is cleared if all of the digits up to the year digits are read.
• Although this bit can be both read and written, normally set this bit to “0”.
VDD
VDET
0.5 s
0.5 s
Detection
pulse
Mode
Read
FDT bit
The supply voltage detection circuit monitors the supply voltage once every 0.5 seconds;
if the supply voltage is lower than the detection voltage value, the FDT bit is set to “1”.
• TM bit: This is a test bit for SEIKO-EPSON’s use. Always set this bit to “0”.
Page - 6
MQ - 252 - 03
RTC - 4543 SA/SB
7. Description of Operation
7-1.Data reads
1
2
52
53
54
54+n
CLK
CE
WR
s1 s2 s4 s8 s10 s20 s40 FDT
Sec
y8 y10 y20 y40 y80
Year
DATA
Output data does not change
1) When the WR pin is low and the CE pin is high, the RTC enters data output mode.
2) At the first rising edge of the CLK signal, the clock and calendar data are loaded into the shift
register and the LSB of the seconds digits is output from the DATA pin.
3) The remaining seconds, minutes, hour, day of the week, day, month, and year data is shifted out,
in sequence and in synchronization with the rising edge of the CLK signal, so that the data is
output from the DATA pin.
The output data is valid until the rising edge of the 52nd clock pulse; even if more than 52 clock
pulses are input, the output data does not change.
4) If data is required in less than 52 clock pulses, that part of the data can be gotten by setting the
CE pin low after the necessary number of clock pulses have been output.
Example: If only the data from “seconds” to “day of the week” is needed:
After 28 clock pulses, set the CE pin low in order to get the data from “seconds” to “day of
the week.”
5) When performing successive data read operations, a wait (tRCV) is necessary after the CE pin
is set low.
6) Note that if an update operation (a one-second carry) occurs during a data read operation,
the data that is read will have an error of -1 second.
7) Complete data read operations within tCE (Max.) = 0.9 seconds, as described earlier.
7-2. Data writes
1
2
52
53
54
54+n
CLK
CE
WR
0
s1 s2 s4 s8 s10 s20 s40
Seconds
y8 y10 y20 y40 y80
Year
DATA
( FDT )
1) When the WR pin is high and the CE pin is high, the RTC enters data input mode.
2) In this mode, data is input, in succession and in synchronization with the rising edge of the CLK
signal, to the shift register from the DATA pin, starting from the LSB of the seconds digits.
3) The sub-seconds counter is reset between the falling edge of the first clock pulse and the rising
edge of the second clock pulse. In addition, carries to the seconds counter are prohibited at the
falling edge of the first clock pulse.
4) After the last data is input to the shift register at the rising edge of the 52nd clock pulse, the
contents of the shift register are transferred to the timer counter.
5) Note that during a data write operation, 52 bits of data must be input.
Correct write-access isn't completed when CE terminal turned into low on a state of less
than 52 bits.
•
If more than 52 bits of data are input, the 53rd and subsequent bits are ignored.
(The first 52 bits of data are valid.)
•
6) Once the CE pin is set low, the prohibition on carries to the seconds counter is lifted.
Complete data write operations within t (Max.) = 0.9 seconds, as described earlier.
CE
7) If a data read operation is to be performed immediately after a data write operation, a wait (tRCV)
is necessary after the CE pin is set low.
* Malfunction will result if illegal data is written. Therefore, be certain to write legal data.
Page - 7
MQ - 252 - 03
RTC - 4543 SA/SB
7-3. Data writes (Divider Reset)
CE
WR
1
2
52
CLK
N Seconds
DATA
s1 s2 s4 s8 s10 s20 s40
y8 y10 y20 y40 y80
Timer,counter
N seconds
0 seconds
N seconds
Divider reset
Pulse
Carry stop
Pulse
After the counter is reset, carries to the seconds digit are halted.After the data write operation,
the prohibition on carries to the seconds counter is lifted by setting the CE pin low.
Complete data write operations within tCE (Max.) = 0.9 seconds, as described earlier.
7-4. FOUT output and 1 Hz carries
CE
WR
tCES
CLK
0
1.0 s
-7.8 ms
tCLK
1Hz
FOUT
15.6 ms
15.6 ms
During a data write operation, because a reset is applied to the Devider counter (from the 128 Hz
level to the 1 Hz level) after the CE pin goes high during the time between the falling edge of the first
clock cycle and the rising edge of the second clock cycle, the length of the first 1 Hz cycle after the
data write operation is 1.0 s +0 / 7.8ms +tCES+tCLK. Subsequent cycles are output at 1.0-second intervals.
−
The 1-Hz signal that is output on FOUT is the internal 1-Hz signal with a 15.6-ms shift applied.
Page - 8
MQ - 252 - 03
RTC - 4543 SA/SB
8. Examples of External Circuits
• Example 1. When used as an RTC + clock source
VDD
Power supply
Switching circuit
VDD
Power supply
Detection circuit
RTC 4543
VDD
CE
WR
DATA
CLK
0.1 µF
FOUT
FSEL
FOE
*1
*2
GND
*1: FOUT output frequency setting (High: 1 Hz; low: 32.768 kHz)
*2: Prohibits FOUT output during back up, reducing current consumption.
• Example 2. When used as a clock source (oscillator)
VDD
RTC-4543
DD
V
CE
WR
VDD
VDD
DATA
CLK
0.1 µF
FOUT
FSEL
FOE
∗1
GND
Page - 9
MQ - 252 - 03
RTC - 4543 SA/SB
9. External Dimensions
RTC - 4543 SA ( SOP-14pin )
10.1 ± 0.2
5.0 7.4 ± 0.2
0.05
Min.
3.2 ± 0.1
0.15
0 - 10°
0.35
1.27
1.2
0.6
∗
The cylinder of the crystal oscillator can be seen in this area ( front ),
but it has no affect on the performance of the device.
RTC - 4543 SB ( SOP-18pin )
0.2
11.4 ±
0.2
7.8 ±
5.4
0.15
1.8 2.0
Max.
0.4
1.27
0.1
0 Min.
0.2
0.6 ±
0 - 10
0.12
10. Layout of Package Markings
Model
RTC - 4543 SA
Frequency
torerance
( SOP-14pin )
R4543 B
E 1234A
Manufacturing
Lot
Model
Frequency
tolerance
RTC - 4543 SB
( SOP-18pin )
R4543 B
1234A
E
Manufacturing
Lot
Note :
The markings and their positions as pictured above are only approximations.
These illustrations do not define the details of the style, size, and position of the characters marked on the packages.
Page - 10
MQ - 252 - 03
RTC - 4543 SA/SB
11. Reference Data
(1) Example of Frequency-Temperature Characteristics
T = +25 °C Typ.
θ
Determining the frequency stability (clock accuracy)
-6
2
α = -0.035 × 10 / °C Typ.
10-6
1.The frequency-temperature characteristics can be
×
+10
0
-10
-20
-30
-40
-50
-60
-70
-80
approximated by the following equation:
2
∆fT = α( T- X)
θ θ
fT
α( /°
: Frequency deviation at any given temperature
: Second-order temperature
∆
C2
)
((-0.035 0.005) 10-6/ C2)
±
×
°
: Highest temperature(+25 C 5 C)
T( C)
θ °
° ± °
-90
: Any given temperature
X( C)
θ
°
-100
-110
-120
-130
-140
-150
2. In order to determine the clock accuracy, add in the
frequency tolerance and the voltage characteristics.
∆f/f = ∆f/f0 + ∆fT + ∆fv
-50 -40 -30 -20 -10
0
+10 +20 +30 +40 +50 +60 +70 +80 +90+100
Temperature [°C]
∆f/f
: Clock accuracy at any given temperature
and voltage (frequency stability)
f/f
∆
: Frequency accuracy
0
∆fT
∆fv
: Frequency deviation at any given temperature
: Frequency deviation at any given voltage
3. Determining the daily error
Daily error =∆f/f × 86400 (seconds)
-6
With error of 11.574 × 10 , the error of the clock is
about one second per day.
(2)Example of Frequency-Voltage
Characteristics
(3)Example of Current Consumption-Voltage
Characteristics
Current consumpiton[ A ]
µ
Frequency [ 10-6 ]
×
Conditions
No load, Ta=+25 C
Conditions
°
5 V reference Voltage,
+1.0
0.0
Ta=+25 C
°
2.0
1.0
2
3
4
5
-1.0
-2.0
Supply voltage (VDD)[V]
0.0
2.0
3.0
4.0
5.0
Supply voltage (VDD) [V]
Note :
This data shows values obtained from a sample lot.
Page - 11
MQ - 252 - 03
RTC - 4543 SA/SB
12. Application notes
12-1. Notes on handling
This module uses a C-MOS IC to realize low power consumption. Carefully note the following cautions when
handling.
(1) Static electricity
While this module has built-in circuitry designed to protect it against electrostatic discharge, the chip
could still be damaged by a large discharge of static electricity. Containers used for packing and
transport should be constructed of conductive materials. In addition, only soldering irons, measurement
circuits, and other such devices which do not leak high voltage should be used with this module, which
should also be grounded when such devices are being used.
(2) Noise
If a signal with excessive external noise is applied to the power supply or input pins, the device may
malfunction or "latch up." In order to ensure stable operation, connect a filter capacitor (preferably
ceramic) of greater that 0.1F as close as possible to the power supply pins (between VDD and GNDs).
Also, avoid placing any device that generates high level of electronic noise near this module.
* Do not connect signal lines to the shaded area in the figure shown in Fig. 1 and, if possible, embed
this area in a GND land.
(3) Voltage levels of input pins
When the input pins are at the mid-level, this will cause increased current consumption and a reduced
noise margin, and can impair the functioning of the device. Therefore, try as much as possible to apply
the voltage level close to VDD or GND.
(4) Handling of unused pins
Since the input impedance of the input pins is extremely high, operating the device with these pins in
the open circuit state can lead to unstable voltage level and malfunctions due to noise. Therefore, pull-
up or pull-down resistors should be provided for all unused input pins.
12-2. Notes on packaging
(1) Soldering heat resistance.
If the temperature within the package exceeds 260, the characteristics of the crystal oscillator will be
degraded and it may be damaged. The reflow conditions within our reflow profile is recommended.
Therefore, always check the mounting temperature and time before mounting this device. Also, check
again if the mounting conditions are later changed.
* See Fig. 2 profile for our evaluation of Soldering heat resistance for reference.
(2) Mounting equipment
While this module can be used with general-purpose mounting equipment, the internal crystal oscillator
may be damaged in some circumstances, depending on the equipment and conditions. Therefore, be
sure to check this. In addition, if the mounting conditions are later changed, the same check should be
performed again.
(3) Ultrasonic cleaning
Depending on the usage conditions, there is a possibility that the crystal oscillator will be damaged by
resonance during ultrasonic cleaning. Since the conditions under which ultrasonic cleaning is carried
out (the type of cleaner, power level, time, state of the inside of the cleaning vessel, etc.) vary widely,
this device is not warranted against damage during ultrasonic cleaning.
(4) Mounting orientation
This device can be damaged if it is mounted in the wrong orientation. Always confirm the orientation of
the device before mounting.
(5) Leakage between pins
Leakage between pins may occur if the power is turned on while the device has condensation or dirt on
it. Make sure the device is dry and clean before supplying power to it.
Fig. 1: Example GND Pattern
Fig. 2: Reference profile for our evaluation of Soldering heat resistance.
( SOP-14pin )
RTC - 4543 SA
Temperature [ °C ]
+260 °C Max.
−1 ∼ −5 °C / s
+1 ∼ +5 °C / s
( SOP-18pin )
RTC - 4543 SB
+170 °C
100 s
+220 °C
35 s
+1 +5 C / s
∼
°
Pre-heating area
Stable Melting area
time [ s ]
Page - 12
MQ - 252 - 03
Application Manual
Distributor
AMERICA
EPSON ELECTRONICS AMERICA, INC.
HEADQUARTER
150 River Oaks Parkway, San Jose, CA 95134, U.S.A.
Phone: (1)800-228-3964 (Toll free) : (1)408-922-0200 (Main) Fax: (1)408-922-0238
Atlanta Office
3010 Royal Blvd. South, Ste. 170, Alpharetta, GA 30005, U.S.A.
Phone: (1)877-332-0020 (Toll free) : (1)770-777-2078 (Main) Fax: (1)770-777-2637
Boston Office
Chicago Office
El Segundo Office
301Edgewater Place, Ste. 120, Wakefield, MA 01880, U.S.A.
Phone: (1)800-922-7667 (Toll free) : (1)781-246-3600 (Main) Fax: (1)781-246-5443
101 Virginia St., Ste. 290, Crystal Lake, IL 60014, U.S.A.
Phone: (1)800-853-3588 (Toll free) : (1)815-455-7630 (Main) Fax: (1)815-455-7633
1960 E. Grand Ave., 2nd Floor, El Segundo, CA 90245, U.S.A.
Phone: (1)800-249-7730 (Toll free) : (1)310-955-5300 (Main) Fax: (1)310-955-5400
EUROPE
EPSON EUROPE ELECTRONICS GmbH
HEADQUARTER
Riesstrasse 15, 80992 Munich, Germany
Phone: (49)-(0)89-14005-0 Fax: (49)-(0)89-14005-110
Düsseldorf Branch Office
Altstadtstrasse 176, 51379 Leverkusen, Germany
Phone: (49)-(0)2171-5045-0 Fax: (49)-(0)2171-5045-10
UK & Ireland Branch Office Unit 2.4, Doncastle House, Doncastle Road, Bracknell, Berkshire RG12 8PE, England
Phone: (44)-(0)1344-381700 Fax: (44)-(0)1344-381701
French Branch Office
LP 915 Les Conquérants, 1 Avenue de l' Atlantique, Z.A. de Courtaboeuf 2
91976 Les Ulis Cedex, France
Phone: (33)-(0)1-64862350 Fax: (33)-(0)1-64862355
ASIA
EPSON (CHINA) CO., LTD.
23F, Beijing Silver Tower 2# North RD DongSangHuan ChaoYang District, Beijing, China
Phone: (86) 10-6410-6655 Fax: (86) 10-6410-7319
4F, Bldg.,27, No.69, Gui Qing Road, Cao hejing, Shanghai, China
Phone: (86) 21-6485-0835 Fax: (86) 21-6485-0775
EPSON HONG KONG LTD.
20/F., Harbour Centre, 25 Harbour Road, Wanchai, Hong kong
Phone: (852) 2585-4600 Fax: (852) 2827-2152
EPSON ELECTRONIC TECHNOLOGY DEVELOPMENT (SHENZHEN )CO., LTD.
Flat 16A, 16/F, New Times Plaza, No.1 Taizi Road, Shenzhen, China
Phone: (86) 755-6811118 Fax: (86) 755-6677786
EPSON TAIWAN TECHNOLOGY & TRADING LTD.
14F, No.7, Song Ren Road, Taipei 110
Phone: (886) 2-8786-6688 Fax: (886)2-8786-6660
EPSON SINGAPORE PTE. LTD.
No.1, Temasek Avenue #36-00, Millenia Tower, Singapore 039192
SEIKO EPSON CORPORATION KOREA Office
50F, KLI 63 Building,60 Yoido-dong, Youngdeungpo-Ku, Seoul, 150-763, Korea
Gumi Branch Office
6F, Good Morning Securities Bldg., 56, Songjeong-dong Gumi-City, Gyongsangbuk-Do,
730-090, Korea
Phone: (82) 54-454-6027 Fax: (82) 54-454-6093
ELECTRONIC DEVICE MARKETING DEPARTMENT
Electronic devices information on WWW server
|