Real time clock module
Product Number (Please contact us)
RA-4574SA : Q41A47452xxxx00
REAL TIME CLOCK MODULE (SPI-Bus)
For Automotive
RA - 4574SA
Built in frequency adjusted 32.768 kHz crystal unit.
Interface Type
: 3-wire serial interface
: 1.6Vto5.5V
Operating voltage range
Wide Timekeeper voltage range : 1.6Vto5.5V
Low backup current
: 0.5A/3V(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
Block diagram
Overview
32.768 kHz
CONTROL LINE
32.768 kHz frequency output function
• FOUT pin output (C-MOS output ), CL=30 pF
• Output frequency selectable from 1/30Hz to 32.768kHz(32 Values)
OSC
CLOCK and
CALENDAR
DIVIDER
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).
FOUT
FCON
OUTPUT
TIMER
CONTROLLER
REGISTER
REGISTER
• Selectable one time mode or repeat mode.
/ TIRQ
/ AIRQ
INTERRUPTS
CONTROLLER
ALARM
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).
DATA
CLK
CONTROL
REGISTER
BUS
INTERFACE
CIRCUIT
CE 1
CE 0
SHIFT REGISTER
Pin Function
Terminal connection/External dimensions (Unit:mm)
RA4574SA
Signal Name Input / Output
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.
1. GND
2. FOUT
3. N.C.
4. N.C.
5. N.C.
6. N.C.
7. VDD
14. FCON
13. CE1
12. DATA
11. CLK
CE0
CE1
Input
Input
CLK
Input
Bi-directional
Output
The shift clock input pin for serial data transfer.
DATA
The data input / output pin for serial data transfer.
5.0
This pin outputs the reference clock signal at 32.768 kHz ( C-MOS output ).
High impedance at the time of output off.
10.
9.
/TIRQ
/AIRQ
FOUT
FCON
/ AIRQ
/ TIRQ
VDD
Input
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.
Output
Output
7.40.2
8. CE0
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.
GND
Connected to a ground.
Specifications (characteristics)
Refer to application manual for details.
Recommended Operating Conditions
Current consumption characteristics
Ta=-40Cto+85C
Item
Symbol
Conditions
Min.
Typ.
Max.
Unit
Item
Symbol
Conditions
Min. Typ. Max. Unit
Power voltage
Clock voltage
Operating
VDD
VCLK
1.6
1.6
3.0
3.0
5.5
5.5
V
V
VDD
=5V
-
-
-
-
1.0
0.5
2.0
1.0
CE0,CE1=GND
TOPR
-40
+25
+85
°C
IBK
µA
µA
temperature
FOUT;Output OFF
(Hi-z)
VDD
=3V
Frequency characteristics
Current
Consumption
Item
Symbol
Conditions
Rating
Unit
VDD
=5V
CE0=GND
CE1=VDD
8.0 20.0
5.0 12.0
Ta=+25°C
VDD=3.0V
Frequency
tolerance
6
f/f
10
B: 523
3Max.
I32k
FOUT;
32.768kHz output ON
CL=30pF
VDD
=3V
Ta=+25°C
VDD=1.6V
Oscillation
start-up time
s
tSTA
Equivalent to 1 minute of monthly deviation