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RA-4574SA Datasheet, PDF (1/2 Pages) Epson ToYoCom – SERIAL-INTERFACE REAL TIME CLOCK MODULE
Real time clock module
REAL TIME CLOCK MODULE (SPI-Bus)
For Automotive
RA - 4574SA
Built in frequency adjusted 32.768 kHz crystal unit.
Interface Type
: 3-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
: 0.5A/3V(Typ.)
32.768 kHz frequency output function : C-MOS output With Control Pin
The various functions include full calendar, alarm, timer.
Applications : Car audio, Car navigation system, Clock, ECU sub clock
Conforms to AEC-Q200
Actual size
Product Number (Please contact us)
RA-4574SA : Q41A47452xxxx00
Block diagramç
32.768 kHz
OSC
DIVIDER
FOUT
FCON
/ TIRQ
/ AIRQ
DATA
CLK
CE 1
CE 0
OUTPUT
CONTROLLER
INTERRUPTS
CONTROLLER
BUS
INTERFACE
CIRCUIT
ç ç ç Overviewç
ç
CONTROL LINE
CLOCK and
CALENDAR
TIMER
REGISTER
ALARM
REGISTER
CONTROL
REGISTER
32.768 kHz frequency output function
• FOUT pin output (C-MOS output ), CL=30 pF
• Output frequency selectable from 1/30Hz to 32.768kHz(32 Values)
Timer function
• Timer function can be set between 1/4096 second and 255 minutes.
• It is recorded automatically to TF-bit at the time of event
occurrence, and it’s possible to output with /TIRQ pin output
(open-drain output).
• Selectable one time mode or repeat mode.
Alarm function
• Alarm function can be set to any combination of day of
week, hour, or minute.
• It is recorded automatically to AF-bit at the time of event
occurrence, and it’s possible to output with /AIRQ pin output
(open-drain output).
SHIFT REGISTER
Pin Functionç
ç ç ç Terminal connection/External dimensionsç (Unit:mm)
Signal Name Input / Output
CE0
Input
CE1
Input
CLK
Input
Function
The chip enabled input pin 0. (Built-in pull-down resistance)
When both CE0 and CE1 pins are at the “H” level , access to this
Real time clock module becomes possible.
The chip enabled input pin 1.
When the CE1 pin is at the HIGH level, the FOUT pin is in the output state.
The shift clock input pin for serial data transfer.
DATA
FOUT
FCON
Bi-directional
Output
Input
The data input / output pin for serial data transfer.
This pin outputs the reference clock signal at 32.768 kHz ( C-MOS output ).
High impedance at the time of output off.
The input pin for the FOUT output control.
/ AIRQ
Output The open drain output pin for alarm and time update interrupts.
/ TIRQ
Output The open drain output pin for timer interrupt.
VDD
-
Connected to a positive power supply.
GND
-
Connected to a ground.
RA4574SA
1. GND
14. FCON
2. FOUT
13. CE1
3. N.C.
12. DATA
4. N.C.
5. N.C.
11. CLK
5.0
10. /TIRQ
6. N.C.
7. VDD
7.40.2
SOP14 pin
9. /AIRQ
8. CE0
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.
Specifications (characteristics)
 Refer to application manual for details.
 Recommended Operating Conditions
Item
Symbol Conditions
Min.
Power voltage
VDD
-
1.6
Clock voltage
VCLK
-
1.6
Operating
temperature
TOPR
-
-40
 Frequency characteristics
Item
Symbol
Conditions
Frequency
tolerance
Oscillation
start-up time
f/f
tSTA
Ta=+25°C
VDD=3.0V
Ta=+25°C
VDD=1.6V
 Equivalent to 1 minute of monthly deviation
Typ. Max. Unit
3.0 5.5
V
3.0 5.5
V
+25 +85 °C
Rating
B: 523
Unit
106
3Max.
s
 Current consumption characteristics
Item Symbol
Conditions
Min.
VDD
CE0,CE1=GND
IBK FOUT;Output OFF
(Hi-z)
=5V -

VDD
=3V -
Current

Consumption
CE0=GND
VDD
CE1=VDD
=5V -

I32k FOUT;
VDD
32.768kHz output ON =3V -
CL=30pF

Ta=-40Cto+85C
Typ. Max. Unit
1.0 2.0
µA
0.5 1.0
8.0 20.0
µA
5.0 12.0