Real time clock module
Epson Toyocom
Product Number (Please contact us)
RA-4574SA : Q41A47451xxxx00
For Automotive
SERIAL-INTER FACE REA L TIME C LOCK MODULE
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
µ
A / 3 V (Typ.)
•
32.768 kHz frequency output function
:
C-MOS output With Control Pin
Actual size
•
The various functions include full calendar, alarm, timer.
•
Conforms to AEC-Q200
Block diagram
32.768 kHz
CONTROL LINE
Overview
•
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)
OSC
DIVIDER
CLOCK and
CALENDAR
•
Timer function
FOUT
FCON
/ TIRQ
/ AIRQ
DATA
CLK
CE 1
CE 0
OUTPUT
CONTROLLER
INTERRUPTS
CONTROLLER
TIMER
REGISTER
ALARM
REGISTER
CONTROL
REGISTER
• 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
BUS
INTERFACE
CIRCUIT
• 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 Function
Signal Name Input / Output
CE0
CE1
CLK
DATA
FOUT
FCON
/ AIRQ
/ TIRQ
V
DD
GND
Input
Input
Input
Bi-directional
Output
Input
Output
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.
The shift clock input pin for serial data transfer.
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.
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.
Terminal connection / External dimensions
RA
−
4574 SA
1.
2.
3.
4.
5.
6.
7.
GND
FOUT
N.C.
N.C.
5.0
1.27
(Unit:mm)
14.
10.1
±
0.2
FCON
CE1
DATA
CLK
/ TIRQ
/ AIRQ
CE0
13.
12.
11.
10.
N.C.
N.C.
V
DD
7.4
±
0 .2
3.2
±
0.1
9.
8.
SOP
−
14 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)
!
Recommended Operating Conditions
Item
Power voltage
Clock voltage
Operating
temperature
Symbol
V
DD
V
CLK
T
OPR
Condition
-
-
-
Min.
1.6
1.6
−
40
Typ.
3.0
3.0
+25
Max.
5.5
5.5
+85
Unit
V
V
°C
∗
Refer to application manual for details.
!
Current consumption characteristics
Item
Symbol
Condition
V
DD
=5V
V
DD
=3V
V
DD
=5V
V
DD
=3V
Min.
T
a
=
−
40
°
C to +85
°
C
Typ.
1.0
Max.
2.0
Unit
CE0, CE1 = GND
I
BK
Current
Consumption
!
Frequency characteristics
Item
Frequency
tolerance
Oscillation
start-up time
Symbol
∆
f/f
Condition
T
a
= +25 °C
V
DD
= 3.0 V
T
a
= +25 °C
V
DD
= 1.6 V
Rating
5
±
23
∗
3 Max.
Unit
×
10
−
6
s
FOUT ;Output OFF
( Hi - z )
µA
0.5
1.0
CE0 = GND
CE1 = V
DD
I
32k
FOUT ;
32.768 kHz output ON
CL = 30 pF
8.0
20.0
µA
t
STA
5.0
12.0
∗
Equivalent to 1 minute of monthly deviation
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