Seiko Epson RTC-4553AC Istruzioni per l’uso

MQ342-01

Application Manual

Real Time Clock Module

RTC-4553AC

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NOTICE

• No part of this material may be reproduced or duplicated in any form or any means without the written

permission of Seiko Epson.

• Seiko Epson reserves the right to make changes to this material without notice.

• Seiko Epson does not assume any liability of any kind arising out of any inaccuracies contained in this

material or due to its application or use in any product or circuit and, further, there is no representation

that this material is applicable to products requiring high level reliability, such as, medical products.

• Moreover, no license to any intellectual property rights is granted by implication or otherwise, and there

is no representation or warranty that anything made in accordance with this material will be free from

any patent or copyright infringement of a third party.

• This material of portions thereof may contain technology or the subject relating to strategic products

under the control of the Foreign Exchange and Foreign Trade Law of Japan and may require an export

license from the Ministry of international Trade and industry or other approval from another government

agency.

In pursuit of "Saving" Technology ,Epson electronic device.

Our Lineup of semiconductors, Liquid crystal displays and quartz devices

assists in creating the products of our customers' dreams.

Epson IS energy savings.

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RTC – 4553AC

CONTETS

1. Overview..........................................................................................1

2. Block Diagram.................................................................................1

3. Terminal description ........................................................................2

3.1. Terminal connections........................................................................................ 2

3.2. Terminal functions............................................................................................. 2

4. Absolute maximum ratings...............................................................3

5. Recommended operating conditions................................................3

6. Frequency characteristics................................................................3

7. Electrical characteristics..................................................................4

7.1. DC, AC Characteristics..................................................................................... 4

7.1.1. VDD = 5 V...........................................................................................................................4

7.1.2. VDD = 3 V...........................................................................................................................5

7.2. Timing Chart..................................................................................................... 6

8. How to use.......................................................................................7

8.1. Registers........................................................................................................... 7

8.1.1. Register Table................................................................................................................... 7

8.1.2. Register Bit Functions ....................................................................................................... 8

8.2. Register Description.......................................................................................... 9

8.2.1. Time/Calendar Counter Registers.....................................................................................9

8.2.2. Control Registers............................................................................................................. 10

8.3. How to use...................................................................................................... 12

8.3.1. Data Read ....................................................................................................................... 12

8.3.2. Data Write/Modify............................................................................................................ 12

8.3.3. Initialize............................................................................................................................ 12

8.3.4. Timing Pulse Output........................................................................................................ 12

8.3.5. Sample Operation Flow Charts........................................................................................13

8.3.6. CS1 and CS0 Operation................................................................................................. 15

8.3.7. System Power Down During Interface Operation............................................................ 15

8.3.8. Power Supply and CS1 Operation................................................................................... 15

8.3.9. Power-On Reset.............................................................................................................. 16

8.3.10. Power Supply Connection Example ..............................................................................16

8.3.11. Processing of Non-Existent Data...................................................................................17

8.3.12. Timing Charts................................................................................................................ 18

9. External dimensions / Marking layout ............................................21

9.1. External dimensions........................................................................................ 21

9.2. Marking layout................................................................................................. 21

10. Reference Data ...........................................................................22

11. Application notes .........................................................................23

11.1. Notes on handling......................................................................................... 23

11.2. Notes on packaging...................................................................................... 23

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RTC – 4553AC

Page - 1 MQ - 342 - 01

Real-Time Clock Module

RTC – 4553AC

•Designed for E-mater

•Built-in 32.768 kHz quartz crystal allows adjustment- free operation and assures high accuracy

•Integrated clock (hours, minutes, seconds) and calendar (year, month, day, day of the week) counter

•Automatic leap year compensation until 2099

•Selectable 24-hour/12-hour display mode (with AM/PM indication)

•Clock data modification using increment method

•Clock data serial output in BCD format

•Software controlled 30 second adjustment

•Selectable 1/10 Hz or 1024 Hz timing pulse output

•Built-in SRAM (30 ×4 bit)

•Constant voltage drive realizes low power consumption (1 µA Typ.)

and minimizes voltage-induced frequency fluctuations

•Supports low-voltage operation (3 V)

1. Overview

The RTC-4553 is a very compact real-time clock module with permanent calendar and serial data

input/output. The module is designed for E-mater; time accuracy is within ±5×10-6 (±0.432 sec./day).

It incorporates a heat-resistant 32.768 kHz quartz oscillator. The space saving package allows high-density

mounting and facilitates automated production.

Besides the clock and calendar functions (comprising all items from years to seconds), the RTC-4553

incorporates also a 30 ×4 bit SRAM and offers other useful features.

The use of a CMOS IC makes possible low-voltage, low-power operation, to ensure proper timekeeping

also when powered from a backup battery.

2. Block Diagram

YearMon.Day

Hou. Day

week

Min.

Control circuit

Shift controller

Input

controller

Output controller

Control

3RAM

(120bit)

Control

Output

controller

32.768 kHz

OSC Counter Sec.

TPOUT

CS0

CS1

SCK

SIN

SOUT

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RTC – 4553AC

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3. Terminal description

3.1. Terminal connections

RTC - 4553

1. GND 14. TPOUT

2. WR 13. SOUT

3. SIN 12. CS1

4. SCK 11. CS0

5. L110. L5

6. L29. L4

7. L3

# 1

# 7

#14

# 8 8. VDD

SOP - 14 pin

3.2. Terminal functions

Signal designation Pin No. Input

/ Output Function

GND 1 — Power supply negative pin. Connect to ground.

( WRITE enable ) 2 I

Address and data are written at WR = "L". Counter data (second digit to

year digit) are written using the incrementing method.

Data at the specified address are read at WR = "H". While the address is

being set at SIN, the data at SOUT are for the previously specified address.

SIN

( Serial input ) 3 I

Serial address and data I/O pin. Serves for address and control register

writing for the various counters, and for RAM address and data writing.

SCK

( Serial clock ) 4 I

Serial I/O sync signal input pin. Input a sync signal to this pin to allow address

and data read/write synchronized to this signal.

One cycle comprises 8 clocks (4 address clocks + 4 data clocks)

L1−L3

L4 , L5 5−7

9, 10 — Test pins reserved for use by Epson. Be sure to leave these pins

unconnected.

VDD 8 —

Power supply pin. Connect to a power source. For normal operation and bus

access, supply 5 V ±10% or 3 V ±10%. For backup battery operation, provide

a voltage of 2 V or higher.

See Note 1.

CS0

( Chip select 0 ) 11 I

This pin serves to select the RTC. While CS0 is "L", the microprocessor

can perform register access. While CS0 is "H", SOUT is in the

high-impedance state.

CS1

( Chip select 1 ) 12 I

Connect this pin to the power down detection circuit. If no power down

detection circuit is used, fix the pin at "H" (VDD). When CS1 is "L", SOUT and

TPOUT are in the high-impedance state, regardless of CS0 .

SOUT

( Serial output ) 13 O

Serial address and data output pin. Serves for address and control register

readout of the various counters, and for RAM address and data readout.

TPOUT

( Timing pulse

output ) 14 O

Output pin for 1024 Hz or 1/10 Hz timing pulse, based on internal reference

clock. For clock accuracy checking, use 1/10 Hz.

For 1024 Hz, the duty cycle changes once every 10 seconds.

Note1 At initial power-on or voltage restoration from an intermediate potential outside of the range where operation is

assured (0.3 V to 1.9 V), the power-on reset circuit may not operate normally, leading to possible malfunction.

(See section " 8.3.9. Power-On Reset ".)

Note2 Be sure to connect a bypass capacitor of 0.1 µF or more directly between VDD and GND.

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RTC – 4553AC

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4. Absolute maximum ratings GND=0 V

Item Symbol Condition (pin) Min. Max. Unit

Power supply voltage VDD VDD−GND −0.3 +6.0

Input voltage VIN S

IN, SCK , WR , CS0 , CS1 −0.3 VDD+0.3

Output voltage VOUT S

OUT, TPOUT −0.3 VDD+0.3

Storage temperature TSTG Stored bare product after unpacking −55 +125 °C

Soldering conditions TSOL —

Twice at under +260 °C within 10 seconds, or

under +230 °C within 3 minutes

5. Recommended operating conditions GND=0 V

Item Symbol Condition Min. Typ. Max. Unit

Power supply voltage VDD VDD−GND 2.7 5.0 5.5 V

Operation temperature TOPR No condensation −30 — +70 °C

6. Frequency characteristics GND=0 V

Item Symbol Condition Rating Unit

± 5 ×10-6

Frequency precision ∆f / fo Ta = +25 °C

VDD = 5.0 V AC ± 0.432 sec. / day

Frequency/temperature

characteristics tOP Ta = −10 °C to +70 °C,

VDD = 5 V (Referenced at +25 °C ) +10

−120 ×10-6

Frequency/voltage

characteristics f / V Ta = Fixed, VDD = 2 V to 5.5 V

(Referenced at 5 V) ± 5 ×10-6

Aging fa Ta = +25 °C, VDD = 5 V, First year ± 5 ×10-6 / year

Note

(1) Frequency tolerance rating applies to VDD = 5.0 V.

(AtV

DD = 3 V, voltage characteristics must be taken into consideration.)

(2) Frequency tolerance rating applies at the time of shipment.

(3) Design the peripheral circuitry so that power start-up time (tR) is 1.0 µs/V ≤tR≤1.6 ms/V.

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RTC – 4553AC

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7. Electrical characteristics

7.1. DC, AC Characteristics

7.1.1. VDD = 5 V

(1) DC Characteristics ( GND=0 V , Ta = −30 °C ∼+70 °C )

VDD = 5 V ± 10 %

Item Symbol Condition Min. Typ. Max. Unit

Data retention

voltage VDH — 2.0 — 5.5 V

IDD1

(normal operation) SCK = 500 kHz

CS0 = L, CS1 = H — — 100

Current

consumption IDD2

(backup

operation)

SCK = 0 Hz

CS0 = H, CS1 = L — 1.0 3.0

µA

VOH IOH = −400 µA VDD −

0.4 — —

Output voltage VOL I

OL = 1.6 mA — — 0.4 V

IOZH V

OUT = 5.5 V −2.0 — 2.0

Output leak

current IOZL V

OUT = 0 V −2.0 — 2.0 µA

VIH — 4/5 VDD — —

Input voltage VIL — — — 1/5 VDD V

IIH V

IN = 5.5 V −2.0 — 2.0

Input current IIL V

IN = 0 V −2.0 — 2.0 µA

Oscillation

startup time Ts Ta = +25 °C — — 3.0 s

(2) AC Characteristics ( GND=0 V , Ta = −30 °C ∼+70 °C )

VDD = 5 V ± 10 %

Item Symbol Condition Min. Typ. Max. Unit

SCK frequency fCLK — — — 500 kHz

SCK "L" time tWCKL — 1.0 — —

SCK "H" time tWCKH — 1.0 — —

SCK pause time tPS — 1.0 — —

CS0 setup time tSCS — 0 — —

CS0 hold time tHCS — 0.5 — —

SIN data setup time tSD — 0.2 — —

SIN data hold time tHD — 0.2 — —

WR setup time tSWR — 1.0 — —

WR hold time tHWR — 0.5 — —

µs

SOUT delay time tDS0 CL=100 pF — 150 500

Time lag between CS0 , CS1 enable

and SOUT output tDSZ1 CL=100 pF — — 100

Time lag between CS0 disable and

SOUT high Z tDSZ2 CL=100 pF — — 100

Time lag between CS1 enable and

TPOUT output tDPZ1 CL=100 pF — — 100

Time lag between CS1 disable and

TPOUT high Z tDPZ2 CL=100 pF — — 100

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RTC – 4553AC

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7.1.2. VDD = 3 V

(1) DC Characteristics ( GND=0 V , Ta = −30 °C ∼+70 °C )

VDD = 3 V ±10 %

Item Symbol Condition Min. Typ. Max. Unit

Data retention

voltage VDH — 2.0 — 3.3 V

IDD1

(normal operation) SCK = 300 kHz

CS0 = L, CS1 = H — — 100

Current

consumption IDD2

(backup

operation)

SCK = 0 Hz

CS0 = H, CS1 = L — 1.0 3.0

µA

VOH IOH = −400 µA VDD−0.4 — —

Output voltage VOL I

OL = 1.2 mA — — 0.4 V

IOZH V

OUT = 3.3 V −2.0 — 2.0

Output leak

current IOZL V

OUT = 0 V −2.0 — 2.0 µA

VIH — 4/5 VDD — —

Input voltage VIL — — — 1/5 VDD V

IIH V

IN = 3.3 V −2.0 — 2.0

Input current IIL V

IN = 0 V −2.0 — 2.0 µA

Oscillation

startup time TSTa = +25 °C — — 3.0 s

(2) AC Characteristics ( GND=0 V , Ta = −30 °C ∼+70 °C )

VDD = 3 V ±10 %

Item Symbol Condition Min. Typ. Max. Unit

SCK frequency fCLK — — — 300 kHz

SCK "L" time tWCKL — 1.5 — —

SCK "H" time tWCKH — 1.5 — —

SCK pause time tPS — 1.5 — —

CS0 setup time tSCS — 0 — —

CS0 hold time tHCS — 1.0 — —

SIN data setup time tSD — 0.2 — —

SIN data hold time tHD — 0.2 — —

WR setup time tSWR — 1.5 — —

WR hold time tHWR — 1.0 — —

µs

SOUT delay time tDSO CL=100 pF — 300 500

Time lag between CS0 , CS1 enable

and SOUT output tDSZ1 CL=100 pF — — 200

Time lag between CS0 disable and

SOUT high Z tDSZ2 CL=100 pF — — 200

Time lag between CS1 enable and

TPOUT output tDPZ1 CL=100 pF — — 200

Time lag between CS1 disable and

TPOUT high Z tDPZ2 CL=100 pF — — 200

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RTC – 4553AC

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7.2. Timing Chart

tps

tDSO

90 %

10 %

90 %

10 %

tDPZ2

tDPZ1

90 %

10 %

90 %

10 %

tSWR tHWR

tDSZ2

tHCS

tWCKH

tWCKL

tSCS 1/f CLK

tHD

tSD

tDSZ1

CS0

SCK

SIN

SOUT

CS0

SCK

SOUT

CS1

TPOUT

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RTC – 4553AC

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8. How to use

8.1. Registers

8.1.1. Register Table

* In positive logic, "H" on the data bus corresponds to "1" in the register.

"ADDRESS_F" of MODE 1 and MODE 2 is the same as "ADDRESS_F" of MODE 0.

Notes

(1) Do not set invalid (out of range) data for the time and calendar. Otherwise counting errors may occur.

(2) At power-on (before initialization), the data for each bit are cleared. Write the registers to set the values.

(3) Always set the D0 bit ( ∗bit) of the control register 2 to "0".

(4) When reading the D1 bit (— bit) of the control register 2, data of this bit are undefined.

(5) Always set the D3 bit (TEST bit) of the control register 3 to "0".

MODE 2 (User RAM register 2)

Address User RAM register

A3 A2 A1 A0 D3 D2 D1 D0

0 0 0 0 0 RA63 RA62 RA61 RA60

100

104

108

112

116

MS0

MODE 1 (User RAM register 1)

Address User RAM register

A3 A2 A1 A0 D3 D2 D1 D0

0 0 0 0 0 RA3 RA2 RA1 RA0

RA4

RA8

RA12

RA16

RA20

RA24

RA28

RA32

RA36

RA40

RA44

RA48

RA52

RA56

MS0

MODE 0

Address Counter control register

A3 A2 A1 A0 Register

designation D3 D2 D1 D0 Register name

0 0 0 0 0 S1 S8S4S2S11-second digit counter

1 0 0 0 1 S10 0 S40 S20 S10 10-second digit counter

2 0 0 1 0 MI1 mi8mi4mi2mi11-minute digit counter

3 0 0 1 1 MI10 0 mi40 mi20 mi10 10-minute digit counter

4 0 1 0 0 H1 h8h4h2h11-hour digit counter

5 0 1 0 1 H10 PM/

AM 0 h20 h10 10-hour digit counter

6 0 1 1 0 W 0 w4w2w1Day of the week digit counter

7 0 1 1 1 D1 d8d4d2d11-day digit counter

8 1 0 0 0 D10 0 0 d20 d10 10-day digit counter

9 1 0 0 1 MO1 mo8mo4mo2mo11-month digit counter

A 1 0 1 0 MO10 0 0 0 mo10 10-month digit counter

B 1 0 1 1 Y1 y8y4y2y11-year digit counter

C 1 1 0 0 Y10 y80 y40 y20 y10 10-year digit counter

D 1 1 0 1 CNT 1 TPS 30ADJ CNTR 24/ 12 Control register 1

E 1 1 1 0 CNT 2 BUSY PONC —∗Control register 2

F 1 1 1 1 CNT 3 SYSR TEST MS1 MS0 Control register 3

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