RX-8035SA Datasheet, PDF (1/2 Pages) Epson Company – REAL TIME CLOCK MODULE (I2C-Bus)

Real time clock module
REAL TIME CLOCK MODULE (I²C-Bus)
High-Stability Frequency with Built in Timestamp and
Power Switching
RX-8035SA/LC
Built-in 32.768 kHz crystal unit : Frequency adjusted for high accuracy.
 (510^6/Ta=+25C)
Interface Type
: I²C-Bus Interface (400kHz)
Operating voltage range
: 2.4Vto5.5V
Timekeeping voltage range
: 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 : When VDD deteriorates than 2.4V,
internal source is switched to VBAT.
.Epson is prepared Linux driver for this product.
(http://www5.epsondevice.com/en/quartz/tech/linux_for_rtc/index.html)
Actual size
RX-8035SA
The registered trademark Linux® is used pursuant to a sublicense from LMI(Linux Mark Institute)
The I²C-Bus is a trademark of NXP Semiconductors.
Product Number (Please contact us)
RX-8035SA: X1B000172xxxx00
RX-8035LC: X1B000182xxxx00
RX-8035LC
Block diagramç
ç ç ç Overviewç
ç
VBAT
Rechargeable
Battery.
or
Capacitor.
VOLTAGE
DETECTOR
OSC
Vout
VOLTAGE
DETECTOR
CLOCK
CALENDER
TIME STAMP
Detects High level.
EVIN1
EVIN2
De-bounce
Main
VDD
/ RES
SCL
SDA
CLKOUT
/ INTA
/ INTB
GND
/ RESET
External
CPU
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 VDD is less than 2.4V, an internal source is switched
to VBAT, and /RES is Low level. When VDD voltage rises to
higher than 2.52V, an internal source is switched to VDD,
and /RES is released with 105ms delay.
Note: When the supply from VBAT, 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 VDD.
Pin functionç
Signal
Name
SCL
SDA
VDD
VBAT
Vout
/ RES
GND
EVIN1
EVIN2
/ INTA
/ INTB
CLKOUT
N.C.
Input /
Output
Input
In/Out
-
-
Output
Output
-
Input
Input
Output
Output
Output
-
Function
I²C serial clock.
I²C data in/out.
Main power supply.
Power supply for backup.
Switched power out.
(maximum output current 20mA)
VDD 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.
Specifications (characteristics)
ç ç ç Terminal connection/External dimensionsç
(Unit:mm)ç
RX8035SA
1. N.C.
2. SCL
3. CLKOUT
4. VBAT
5.0
5. N.C.
6. VDD
7. Vout
7.40.2
SOP14 pin
14. EVIN2
13. / INTB
12. SDA
11. GND
10. / INTA
9. / RES
8. EVIN1
RX8035LC
1. Vout
12. EVIN1
2. VDD
11. / RES
3. N.C.
10. / INTA
4. VBAT
2.4
9. GND
5. CLKOUT
8. SDA
6. SCL
2.8
7. / INTB
VSOJ12pin
 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
 Refer to application manual for details.
 Recommended Operating Conditions
Item
Symbol Conditions Min.
Operating voltage
VACCESS
VDD
2.4
Time keeping voltage VCLK
VBAT
1.0
Operating temperature TOPR
-
-40
Storage temperature
TSTG
-
-55
 Frequency characteristics
Item
Symbol
Conditions
Frequency
tolerance
f/f
Ta=+25°C
VBAT=3.0V
Oscillation
start-up time
tSTA
Ta=+25°C
VDD=3.0V
Frequency / voltage
characteristics
f/V
Ta=+25°C
VDD=2.4Vto5.5V
1) Equivalent to 1 minute of monthly deviation (excluding offset.)
2) Equivalent to 13 seconds of monthly deviation (excluding offset.)
Typ. Max. Unit
3.0 5.5
V
3.0 5.5
V
+25 +85 C
- +125 C
Rating
B: 523 ^1)
AA: 55^2)
AC: 05^2)
1Max.
1Max.
Unit
10^6
s
10^6
 Current consumption characteristics
Item
Symbol
Conditions
Min.
RX-8035SA
VBAT=3.0V, VDD = 0.0V
IBAT
 SCL=SDA = GND
RX-8035LC
-
Current
Consumption
VBAT=3.0V, VDD = 0.0V
SCL=SDA = GND
VDD = 3.0V
IDD SCL=SDA = GND
-
CLKOUT = open
Ta=-40Cto+85C
Typ. Max. Unit
350
1200 nA
400
1.40 2.50 µA
 Power supply detection voltage
Item
Symbol Conditions
VBAT detect voltage
Power switching voltage
(VDD to VBAT)
VLOW
VD2B
-
+25C
Min.
1.10
2.328
Ta=-40Cto+85C
Typ. Max. Unit
1.25 1.40 V
2.40 2.472 V