RX-4581NB Datasheet, PDF (1/2 Pages) Epson ToYoCom – SERIAL-INTERFACE REAL TIME CLOCK MODULE

Real time clock module
Built-in SRAM
SERIAL-INTERFACE REAL TIME CLOCK MODULE
RX - 4581 NB
•Built in frequency adjusted 32.768 kHz crystal unit.
•Interface Type
: 4-wire serial interface
•Operating voltage range
: 1.6 V to 5.5 V
•Wide Timekeeper voltage range : 1.6 V to 5.5 V
•Low backup current
: 0.4 µA / 3 V ( Typ. )
•Built-in SRAM
: Built-in 128 bit ( 8 bit × 16 ) RAM.
•32.768 kHz frequency output function : C-MOS output With Control Pin
•The various functions include full calendar, alarm, timer.
Actual size
Epson Toyocom
Product Number (Please contact us)
RX-4581NB : Q41458191000200
Block diagramç
32.768 kHz
FOUT
FOE
/ AIRQ
/ TIRQ
OSC
DIVIDER
FOUT
CONTROLL ER
INTERRUPTS
CONTROLL ER
DI
DO
BUS
CLK
INTERFACE
CE1
CIRCUIT
CE0
CLOCK
an d
CALENDAR
TIMER
REGISTER
AL ARM
REGISTER
CONTROL
REGISTER
an d
SYSTEM
CONTROLL ER
RAM 128 bit
( 8 bit × 16 )
ç ç ç Overviewç
ç
• Built-in SRAM
• Include 128 bit ( 8 bit × 16 ) RAM.
• Interface Type
• Serial interface in 4 lines form.
∗ It is poss ible to make it to 3 lines by wired-OR connecting
DI and DO pins.
• 32.768 kHz frequency output function
• FOUT pin output (C-MOS output), CL=30 pF
• FOE pin enables output on/off control.
• Timer function
• Timer function can be set up between
1/4096 second and 4095 minutes.
• It is recorded automatic to TF-bit at the time of event
occurrence,and possible to output with /TIRQ pin output
(open-drain output).
• Interrupt function
• Alarm interrupt function , and timer interrupt function.
Pin Functionç
Signal Name Input/Output
Function
CE0
Input
The chip enabled input pin 0. ( It has a built -in pull-down resistance )
CE1
CLK
DI
DO
Input
Input
Input
Output
The chip enabled input pin 1. ( It does not have a built -in pull-down resistance )
The shift clock input pin for serial data transfer.
The data input pin for serial data trasfer.
The data output pin for serial data trasfer.
FOUT
Output
This pin outputs the reference clock signal at 32.768 kHz ( CMOS output ).
High impedance at the time of output off.
FOE
/ AIRQ
/ TIRQ
VDD
GND
Input
Output
Output
-
-
The input pin for the FOUT output control.
The open drain output pin for alarm and time update interrupts.
The open drain output pin for timer interrupt.
Connected to a positive power supply.
Connected to a ground.
ç ç ç Terminal connection / Externaldimensionsç
(Unit:mm) ç
1. GND
2. CE1
3. CE0
4. DI
5. DO
6. CLK
7. / TIRQ
8. / AIRQ
9. FOE
10. FOUT
11. VDD
RX− 4581 NB
22. ^N.C.
21. ^N.C.
20. N.C.
19. ^N.C.
18. ^N.C.
17. ^N.C.
4.8
16. ^N.C.
15. ^N.C.
1.3 ± 0.1 _{14. N.C.}
5.0 ± 0.2
13. ^−
12. ^−
SON − 22 pin
Metal may be exposed on the top or bottom of this product.
This w ill not affect any quality, reliability or electrical spec.
Specifications (characteristics)
* Refer to application manual for details.
! Recommended Operating Conditions
Item
Symbol
Condition
Min. Typ. Max.
Power voltage
VD D
-
1.6 3.0 5.5
Clock voltage
VCLK
-
1.6 3.0 5.5
Operating
temperature
TOPR
-
−40 +25 +85
! Frequency characteristics
Item
Symbol
Condition
Rating
Frequency
tolerance
Oscillation
start-up time
∆f/f
tSTA
Ta = +25 °C
VDD = 3.0 V
Ta = +25 °C
VDD = 3.0 V
5 ± 23 ^∗
3 Max.
∗ Please ask for tighter tolerance. (Equivalent to 1 minute of monthly deviation)
Unit
V
V
°C
Unit
× 10^−6
s
! Current consumption characteristics
Item
Symbol
Condition
T a = −40 °C to +85 °C
Min. Typ. Max. Unit
Current
Consumption
CE0, CE1 = GND ^VDD
FOE = GND
=5V
IBK
FOUT ;output OFF _VDD
( Hi - z )
=3V
CE0, CE1 = GND VDD
FOE = VDD
=5V
I32k _{FOUT ;}
32.768 kHz output ON ^VDD
CL = 30 pF
=3V
0.6 1.2
µA
0.4 0.8
8.0 20.0
µA
5.0 12.0
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