Real time clock module
REAL TIME CLOCK MODULE (I
2
C-Bus)
High-Stability Frequency with Built in Timestamp and
Power Switching
Product Number (Please contact us)
RX-8035SA: X1B000172xxxx00
RX-8035LC: X1B000182xxxx00
RX
-
8035SA
/
LC
:
Frequency adjusted for high accuracy.
(510
6
/T
a
=+25C)
2
Interface
Type
:
I C-Bus Interface (400kHz)
Operating
voltage range
:
2.4Vto5.5V
Timekeeping
voltage range
:
1.0Vto5.5V
Low
backup current
:
350 nA (SA) 400 nA (LC)/
3V(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
:
When V
DD
deteriorates than 2.4V,
internal source is switched to V
BAT.
.
The I C-Bus is a trademark of NXP Semiconductors
2
Built-in
32.768 kHz crystal unit
Actual size
RX-8035SA
RX-8035LC
Block diagram
Main
Vout
VBAT
VOLTAGE
DETECTOR
VOLTAGE
DETECTOR
/ RES
/ RESET
Overview
The
event detection and Timestamp function
Dual event detection terminals.
Selectable de-bounce period 35ms or 2s.
Available event detection interrupt output.
Power
switching functions.
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-alarm.
Interrupt
period are selectable from 2Hz to Monthly.
CLKOUT outputs 32.768kHz clock powered by V
DD
.
VDD
Rechargeable
Battery.
or
Capacitor.
CLOCK
OSC
CALENDER
TIME STAMP
SCL
SDA
CLKOUT
/ INTA
/ INTB
LEVEL
SHIFTER
External
CPU
Detects High level.
EVIN1
EVIN2
GND
De-bounce
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 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
2
Terminal connection/External dimensions
RX8035SA
1.
2.
3.
4.
5.
6.
7.
N.C.
SCL
CLKOUT
VBAT
5.0
(Unit:mm)
RX8035LC
0.5
1.27
14.
10.1
0.2
EVIN2
/ INTB
SDA
GND
/ INTA
/ RES
EVIN1
1. Vout
2. VDD
3. N.C.
4. VBAT
5. CLKOUT
6. SCL
12.
3.6
EVIN1
/ RES
/ INTA
GND
SDA
/ INTB
13.
12.
11.
10.
11.
10.
2.4
9.
1.2
Max.
N.C.
3.2
0.1
8.
7.
VDD
Vout
7.4
0.2
9.
8.
2.8
VSOJ12pin
SOP14 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 cryst al
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
Consumption
Refer to application manual for details.
Current consumption characteristics
Item
Symbol
T
a
=-40Cto+85C
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
=3.0V
T
a
=+25°C
V
DD
=3.0V
T
a
=+25°C
V
DD
=2.4Vto5.5V
Rating
B: 523
1)
AA: 55
2)
AC: 05
2)
1Max.
1Max.
Unit
10
6
s
10
6
I
DD
-
1.40
2.50
µA
Power supply detection voltage
Item
V
BAT
detect voltage
Power switching voltage
(V
DD
to V
BAT
)
Symbol
V
LOW
V
D2B
Conditions
-
+25
C
Min.
1.10
2.328
T
a
=-40Cto+85C
t
STA
f/V
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.)
Talking
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