Real time clock module
REAL TIME CLOCK MODULE (I
2
C-Bus)
High-Stability Frequency with Built in Timestamp and
Power Switching
RX - 8035 SA
/
LC
:
Frequency adjusted for high accuracy.
(± 5
×10
−
6
/ T
a
= +25
°C)
2
•Interface
Type
:
I C-Bus Interface (400kHz .
•Operating
voltage range
:
2.4 V to 5.5 V
•wide
voltage for Timekeeping.
:
1.0 V to 5.5 V
•Low
backup current
:
350 nA (SA) 400 nA (LC) / 3 V (Typ.)
•Event
detection and Time stamp
:
One-shot full timestamp and interrupt.
•Dual
event detection ports
:
Each terminal has a de-bounce circuit.
•Auto
power switching functions
:
It switches VDD and VBAT, automatically.
•Dual
Alarm, Periodic interruption.
Epson prepared Linux driver for development.
(http://www5.epsondevice.com/en/information/support/linux_rtc/)
The registered trademark Linux® is used pursuant to a sublicense from LMI(Linux Mark Institute)
2
The I C-Bus is a trademark of NXP Semiconductors.
•Built-in
32.768 kHz crystal unit
Product Number (Please contact us)
RX-8035SA B : X1B000172000100
RX-8035SA AC : X1B000172000200
RX-8035SA AA : X1B000172000300
RX-8035LC B : X1B000182000100
RX-8035LC AC : X1B000182000200
RX-8035LC AA : X1B000182000300
Actual size
RX-8035SA
RX-8035LC
Block diagram
Main
V
OUT
Battery backup connection example (1)
V
BAT
V
OUT
R
Overview
•
The event detection and Timestamp function
Dual event detection terminals.
Selectable de-bounce time 35ms or 2s.
Available event detection interrupt output.
•
Power switching functions.
•An
external diode is unnecessary to have a reverse
current prevention switch built-in in the VBAT side to
connect a primary cell to.
•
When V
DD
is less than 2.4V, an internal source is switched
to V
BAT
, and /RES is Low level. When V
DD
voltage rises to
higher than 2.52V, an internal source is switched to V
DD
,
and /RES is released with 105ms delay.
•
Note: When the supply from V
BAT
, SCL and SDA are
disabled.
•
Alarm, Periodic interrupt, 32.768kHz clock output.
•Available
monthly-alarm and weekly- Dual alarm.
•Interrupt
period are selectable from 2Hz to Monthly.
•
CLKOUT outputs 32.768kHz, it powered from V
DD
.
V
BAT
VOLTAGE
DETECTOR
VOLTAGE
DETECTOR
V
DD
primary
battery
C
/ RES
Battery backup connection example (2)
V
BAT
R
CLOCK
OSC
CALENDER
TIME STAMP
SCL
SDA
CLKOUT
/ INTA
/ INTB
LEVEL
SHIFTER
V
OUT
C
EDLC
or
secondary
battery
Detects High level.
EVIN1
EVIN2
De-bounce
GND
Pin function
Signal
Name
SCL
SDA
V
DD
V
BAT
Vout
/ RES
GND
EVIN1
EVIN2
/ INTA
/ INTB
CLKOUT
N.C.
Input /
Output
Input
In/Out
-
-
Output
Output
-
Input
Input
Output
Output
Output
-
Function
I
2
C serial clock.
I C data in/out.
Main power supply.
Power supply for backup.
Switched power out.
(maximum output current 20mA)
V
DD
voltage state.
Ground
Event detection input 1
Event detection input 2
Interrupt out A.
Interrupt out B.
32.768kHz output. (CMOS. Can not inhibit.)
Do not connect.
2
Terminal connection / External dimensions
RX
−
8035 SA
1.
2.
3.
4.
5.
6.
7.
N.C.
SCL
CLKOUT
VBAT
5.0
1.27
(Unit:mm)
RX
−
8035 LC
13.
12.
11.
10.
3.2
±
0.1
10.1
±
SDA
GND
/ INTA
/ RES
EVIN1
3. N.C.
4. VBAT
5. CLKOUT
6. SCL
2.8
2.4
3.6
/ INTB
0.2
2. VDD
0.5
14.
EVIN2
1. Vout
12.
11.
10.
9.
1.2
Max.
EVIN1
/ RES
/ INTA
GND
SDA
/ INTB
N.C.
VDD
Vout
7.4
±
0.2
8.
7.
9.
8.
VSOJ
−
12pin
SOP
−
14 pin
The metal case inside of the molding compound may be exposed on the top or bottom of this product.
This purely cosmetic and does not have any effect on quality, reliability or electrical specs.
*Stop using the glue
Any glue must never use it after soldering LC-package to a circuit board.This product has glass on the back side of a package.When
glue invasions between circuit board side and glass side, then glass cracks by thermal expansion of glue.In this case a crystal
oscillation stops.Consider glue abolition or glue do not touch to LC-package
Specifications (characteristics)
Recommended Operating Conditions
Item
Symbol
Conditions
V
DD
V
BAT
-
-
Min.
2.4
1.0
-40
-55
Typ.
3.0
3.0
+25
-
Max.
5.5
5.5
+85
+125
Unit
V
V
°C
°C
Current
C onsumption
∗
Refer to application manual for details.
Current consumption characteristics
Item
Symbol
T
a
= -40
°C
to +85
°C
Conditions
RX-8035SA
V
BAT
= 3.0V, V
DD
= 0.0V
SCL=SDA = GND
RX-8035LC
V
BAT
= 3.0V, V
DD
= 0.0V
SCL=SDA = GND
V
DD
= 3.0V
SCL=SDA = GND
CLKOUT = open
Min.
Typ.
350
Max.
Unit
Operating voltage
V
ACCESS
Time keeping voltage
V
CLK
Operating temperature
T
OPR
Storage temperature
T
STG
I
BAT
-
400
1200
nA
Frequency characteristics
Item
Frequency
tolerance
Oscillation
start-up time
Frequency / voltage
characteristics
Symbol
∆
f/f
Conditions
T
a
= +25°
C
V
BAT
= 3.0 V
T
a
= +25 °C
V
DD
= 3.0 V
T
a
= +25 °C
V
DD
= 2.4 V to 5.5 V
Rating
B: 5
±
23
AA: 5
±
5
AC: 0
±
5
1 Max.
±
1 Max.
∗1)
∗2)
∗2)
Unit
×
10
−6
I
DD
-
1.40
2.50
µA
Power supply detection voltage
s
×
10
−6
T
a
= -40
°C
to +85
°C
t
STA
f/V
Item
Symbol
Conditions
-
+25
°C
Min.
1.10
2.328
Typ.
1.25
2.40
Max.
1.40
2.472
Unit
V
V
∗1)
Equivalent to 1 minute of monthly deviation (excluding offset.)
∗2)
Equivalent to 13 seconds of monthly deviation (excluding offset.)
Voltage of low battery
V
LOW
voltage.
Power switching voltage
V
D2B
(V
DD
to V
BAT
)
PROMOTION OF ENVIRONMENTAL MANAGEMENT SYSTEM
CONFORMING TO INTERNATIONAL STANDARDS
At Seiko Epson, all environmental initiatives operate under the
Plan-Do-Check-Action (PDCA) cycle designed to achieve continuous
improvements. The environmental management system (EMS)
operates under the ISO 14001 environmental management standard.
All of our major manufacturing and non-manufacturing sites, in
Japan and overseas, completed the acquisition of ISO 14001
certification.
ISO 14000 is an international standard for environmental
management that was established by the International
Standards Organization in 1996 against the background of
growing concern regarding global warming, destruction of
the ozone layer, and global deforestation.
WORKING FOR HIGH QUALITY
In order provide high quality and reliable products and services
than meet customer needs,
Seiko Epson made early efforts towards obtaining ISO9000 series
certification and has acquired ISO9001 for all business
establishments in Japan and abroad. We have also acquired ISO/TS
16949 certification that is requested strongly by major automotive
manufacturers as standard.
►Explanation
of the mark that are using it for the catalog
►Pb
free.
►Complies
with EU RoHS directive.
*About the products without the Pb-free mark.
Contains Pb in products exempted by EU RoHS directive.
(Contains Pb in sealing glass, high melting temperature type solder or other.)
►Designed
for automotive applications such as Car Multimedia, Body Electronics, Remote Keyless Entry etc.
ISO/TS16949 is the international standard that added the
sector-specific supplemental requirements for automotive
industry based on ISO9001.
►Designed
for automotive applications related to driving safety (Engine Control Unit, Air Bag, ESC etc ).
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 data, circuitry, software, usage, etc. written in this material is intended for reference only. Seiko Epson
does not assume any liability for the occurrence of customer damage or 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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