Real time clock module
Product Number (Please contact us)
RX-4803SA: X1B000132xxxx00
RX-4803LC: X1B000122xxxx00
REAL TIME CLOCK MODULE (SPI-Bus)
Built-in 32.768 kHz-DTCXO, High Stability
RX - 4803 SA/LC
Built in frequency adjusted 32.768 kHz crystal unit and DTCXO.
1/100s resolution Time register
Interface Type
: 4-wire serial interface
Interface voltage range
: 1.6 V to 5.5 V
Temp. compensated voltage range : 2.2 V to 5.5 V
Clock supply voltage range : 1.6 V to 5.5 V
Selectable clock output (32.768 kHz, 1024 Hz, 1 Hz)
The various functions include full calendar, alarm, timer, EVIN input.
Epson is prepared Linux driver for this product.
Actual size
RX-4803SA
RX-4803LC
(http://www5.epsondevice.com/en/quartz/tech/linux_for_rtc/index.html)
The registered trademark Linux® is used pursuant to a sublicense from LMI(Linux Mark Institute)
Block diagram
Overview
High Stability
UA ± 3.4 x 10-6
/
-40 ºC to +85 ºC
32.768 kHz
( Equivalent to 9 seconds of month deviation )
UB ± 5.0 x 10-6
-40 ºC to +85 ºC
( Equivalent to 13 seconds of month deviation )
UC -30 ºC to +70 ºC
± 5.0 x 10-6
AA (+5 ± 5.0) x 10-6
+25 ºC
/
32kHz
DTCXO
/
/
High Resolution: 1/100s Time register with capture buffer
CLOCK
and
DIVIDER
CALENDAR
32.768 kHz frequency output function
FOUT pin output (C-MOS output), CL=30 pF
Output selectable: 32.768 kHz, 1024 Hz, 1 Hz
FOE
FOUT
TIMER
REGISTER
FOUT
CONTROLLER
The various interrupt
Timer Function can be set between 1/ 4096 second and
4095 minutes.
EVIN
/ INT
INTERRUPT
CONTROLLER
ALARM
REGISTER
Alarm Function can be set to day of week, day, hour, or minute.
EVIN input.
D I
SYSTEM
CONTROLLER
and
CONTROL
REGISTER
DO
INTERFACE
CIRCUIT
Time synchronize function with 1PPS signal input
Register compatibility: upper compatible with RX-4801.
CLK
CE
*It is possible to use it by the terminal connection as
32.768 kHz-DTCXO.
Pin Function
Terminal connection/External dimensions
(Unit:mm)
RX4803LC
RX4803SA
Signal Name
I / O
Function
The chip enable input pin.
The shift clock input pin for serial data transfer.
The pin outputs the reference clock signal.
( CMOS output )
Use by the manufacture for testing.
( Do not connect externally. RX-4803SA only.)
Connected to a positive power supply
The input pin for the FOUT output control.
External event input.
1. CE
14. DI
1. N.C.
2. FOE
3. VDD
4. FOUT
5. CLK
6. CE
12. EVIN
CE
CLK
input
input
2. CLK
3. FOUT
4. N.C.
5. TEST
6. VDD
7. FOE
13. DO
11. /INT
10. GND
9. T2(Vpp)
8. DO
12. T2(VPP)
11. GND
FOUT
TEST
Output
input
5.0
2.4
10.
/INT
VDD
FOE
EVIN
/ INT
GND
-
9. EVIN
8. N.C.
input
input
7.40.2
7. DI
2.8
SOP14 pin
VSOJ12pin
Output Interrupt output (N-ch. open drain).
-
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.
Connected to a ground
Use by the manufacture for testing.
( Do not connect externally.)
*Stop using the glue
T2(VPP)
-
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
DO
D I
Output The data output pin for serial data transfer.
input The data input pin for serial data transfer.
expansion of glue.In this case
LC-package
a
crystal oscillation stops.Consider glue abolition or glue do not touch to
Specifications (characteristics)
Refer to application manual for details.
Electrical Characteristics
32.768 kHz-DTCXO Frequency temperature characteristics (Example)
Item
Interface voltage
Symbol
Conditions
Interface voltage
Min.
Typ.
Max.
Unit
Frequency temperature characteristics
VDD
VTEM
VCLK
1.6
2.2
1.6
3.0
3.0
3.0
5.5
5.5
5.5
V
V
V
10
Temp. compensated Voltage
Clock supply voltage
Temp. compensated voltage
-
5
32.768 kHz DTCXO
0
-5
Operating temperature
TOPR
No condensation
-40
+25
+85
ºC
1
UA
Ta= -40 ºC to +85 ºC
±3.4
±5.0
UB
UC
Ta=-40 ºC to +85 ºC
Ta= -30 ºC to +70 ºC
-10
f/f
10-6
2
3
Stability
-15
Tuning fork X'tal
AA
Ta=+25 ºC
5 ± 5.0
0.75
-20
-25
-30
Backup Mode
FOE = GND,
/INT = VDD
Current consumption (1)
IDD1
IDD2
VDD = 5V
VDD = 3V
-
-
3.4
2.1
A
Current consumption (2)
0.75
FOUT output : OFF
-45 -35 -25 -15
-5
5
15
25
35
45
55
65
75
85
1)
2)
Equivalent to 9 seconds of month deviation.
Equivalent to 13 seconds of month deviation.
Temperature (ºC)
3)
Equivalent to 13 seconds of month deviation. ( excluding offset )
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