http://www.epsontoyocom.co.jp
Real time clock module
Real time clock moduleReal time clock module
Real time clock module
Epson Toyocom
Eps o n To yo co mEps o n To yo co m
Eps o n To yo co m
Actual size
Block diagram
Overview
BUS
INTERFACE
CIRCUIT
CE 1
CLK
DATA
32.768 kHz
CE 0
CONTROL
REGISTER
SHIFT REGISTER
ALARM REGISTER
TIMER REGISTER
CLOCK a nd
CALENDAR
INTERRUPTS
CONTROLLER
OUTPUT
CONTROLLER
DIVIDER
CONTROL LIN E
FOUT
/ TIRQ
/ AIRQ
OSC
FCON
•
••
•
32.768 kHz frequ ency output function
• FOUT pin output (C-MOS output), CL=30 pF
• Output frequency is selectable from 1/30 Hz to 32.768 kHz
(32 Values)
•
••
•
Timer function
• Timer function which can be set up 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).
• Selectable one time mode or repeat mode.
•
••
•
Alarm function
• Alarm function can be set to any combination of day of
week, hour, or minute.
•It is recorded autom atically to AF-bit at the time of event
occurrence, and it’s possible to output with /AIRQ pin output
(open-drain output).
∗
∗∗
∗
Functions are compatible with RTC -4574
SA
/
JE
/
NB.
Pin Fu nction
Terminal connection
/
Exte rnal dimensions
(
Unit:mm
)
Signal Name Inpu t / Output Function
CE0 Input
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.
CE1 Input
The chip enabled input pin 1.
When the CE1 pin is at the HIGH level, the FOUT pin is in th e output state.
CLK Input The shift clock input pin for serial data transfer.
DATA Bi-directional The data input / output pin for serial data transfer.
FOUT Output
This pin outputs the reference clock s ignal at 32.768 kHz ( C-MOS output ).
High impedance at the time of output off.
FCON Input The input pin for the FOUT output control.
/ AIRQ Output The open drain output pin for alarm and time update interrupts.
/ TIRQ Output The open drain output pin for timer interrupt.
V
DD
-
Connected to a positive power supply.
GND
-
Connected to a ground.
RX − 4574 LC
1. N.C. 12. V
DD
2. N.C. 11. CE1
3. /
TIRQ 10. CLK
4. /
AIRQ 9. DATA
5. FCON 8. CE0
6. FOUT
0.5
2.4
3.6
1.2
Max.
2.8
7. GND
VSOJ − 12pin
S
p
ecifications
(
characteristics
)
∗Refer to a
pp
lication manual for details.
!
!!
!
Recommended Operating Conditions
Item Symbol Condition Min. Typ. Max. Unit
Power voltage V
DD
-
1.6 3.0 5.5 V
Cl oc k voltag e V
CLK
-
1.3 3.0 5.5 V
Operating
temperature T
OPR
-
-40 +25 +85
°C
!
!!
!
Frequency characteristics
Item Symbol Condition Rating Unit
Frequency
tolerance ∆ f / f T
a
= +25 °C
V
DD
= 3.0 V 5 ± 23 *
× 10−6
T
a
= +25 °C
V
DD
= 1.6 V 1 Max. s
Oscillation
Start-up time
t
STA
T
a
= -40 °C to +85 °C
V
DD
= 1.6 V 3 Max. s
*Equ iv alent to 1 minut e of monthl y d eviation
!
!!
!
Cu rrent consumption characteris tics
T
a
= −40 °C to +85 °C
Item Symbol Condition Min. Typ. Max. Unit
V
DD
= 5 V
0.45 0.9
I
BK
CE0, CE1 = GND
FOUT ;output OFF
( Hi - z ) V
DD
= 3 V
0.35 0.7
µA
V
DD
= 5 V
8.0 20.0
Current
Consumption
I
32k
CE0 = GND
CE1 = V
DD
FOUT ;
32.768 kHz output ON
CL = 30 pF
V
DD
= 3 V
5.0 12.0
µA
Small size, low p rofile mod el package
SERIAL-INT ERF ACE REAL TIME CLOC K MODUL E
RX
-
4574
LC
•
Built in frequency adjusted 32.768 kHz crystal unit.
•
In te r fa ce T ype
:
3-wire serial interface
•
Op er at in g volt ag e r an g e
:
1.6
V
to
5.5
V
•
Wide Timekeeper voltage range
:
1.3
V
to
5.5
V
•
Low backup current
:
0.35
µ
A
/
3
V
(Typ.)
•
32.768 kHz frequency output function
:
C-MOS output With Control Pin
•
T h e vari ous func tions inc l ud e ful l c al end ar, al arm, ti m er.
“Quartz + MEMS” EPSON TOYOCOM
I n or der t o m eet c ustom er n eeds in a ra pidl y adv anc ing digi tal ,
broadband and ubiquitous society, we are committed to offering
products t hat are one step ahead of the m arket and a r ank above
the rest in quality. To achieve our goals, we follow a “3D (three
device) strategy” designed to drive both horizontal and vertical
growth. We will to grow our three device categories of “Timing
Devices”, ”Sensing Devices” and “Optical Devices”, and expand
vertical growth through a combination of products from these
categories.
A Quartz MEMS is any high added value quartz device that exploits the
characteristics of quartz crystal material but that is produced using MEMS
(micro-electro-mechanical system ) processing technology.
Market needs are advancing faster than previously imagined toward
sm al ler, m ore st able cr yst al produc ts, but we w ill st ay ahead of t he c urve
by rolling out products that exceed market speed and quality
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Quartz devices have b ecome cruc ial i n the network environment
where products are increasingly intended for broadband,
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cour se of the c omi ng months .
We apologize for the inconvenience, but we will eventually have a unified part numbering system for Epson Toyocom that will be user friendly.
QS-9000 is an enhanced standard for qualit
y
assurance systems formulated by leading
U.S . aut om obil e m anufact ur ers b as ed on
th e int er n ati on al I SO 90 00 s eri es .
ISO 14000 is an international standard for environmental
management that was establi shed by the Internat ional
Standards Organization in 1996 against the background
of growing concern regarding global warming, de struction
of th e oz on e lay er, and gl ob al deforest ation.
ISO/TS 16949 is a global standard based on
QS-9000 , a s evere st andard c orresp onding t o
the requirements from the automobile industry.
