RA-4574SA Datasheet, PDF (1/2 Pages) Epson ToYoCom – SERIAL-INTERFACE REAL TIME CLOCK MODULE

Real time clock module
For Automotive
SERIAL-INTERFACE REAL TIME CLOCK 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 µA / 3 V (Typ.)
•32.768 kHz frequency output function : C-MOS output With Control Pin
•The various functions include full calendar, alarm, timer.
•Conforms to AEC-Q200
Actual size
Epson Toyocom
Product Number (Please contact us)
RA-4574SA : Q41A47451xxxx00
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 s electable 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 tim e 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 s et to any com bination of day of
week, hour, or minute.
• It is recorded automatically to AF-bit at the tim e of event
occurrence, and it’s possible to output with /AIRQ pin output
(open-drain output).
SHIFT REGISTER
Pin Functionç
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.
ç ç ç Terminal connection / External dimensionsç (Unit:mm) ç
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
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
Symbol
Condition
Min.
Power voltage
VD D
-
1.6
Clock voltage
VCLK
-
1.6
Operating
temperature
TOPR
-
−40
! Frequency characteristics
Item
Symbol
Condition
Frequency
tolerance
∆f/f
Ta = +25 °C
VDD = 3.0 V
Oscillation
start-up time
tSTA
Ta = +25 °C
VDD = 1.6 V
∗ Equivalent to 1 minute of monthly deviation
Typ. Max.
3.0
5.5
3.0
5.5
+25 +85
Rating
5 ± 23 ^∗
3 Max.
Unit
V
V
°C
Unit
× 10^−6
s
∗ Refer to application manual for details.
! Current consumption characteristics
Ta = −40 °C to +85 °C
Item
Symbol
Condition
Min. Typ. Max. Unit
Current
C onsu mpti on
CE0, CE1 = GND
IBK _{FOUT ;Output OFF}
( Hi - z )
VD D
=5V
VD D
=3V
CE0 = GND
CE1 = VDD
VD D
=5V
I32k _{FOUT ;}
VD D
32.768 kHz output ON _{= 3 V}
CL = 30 pF
1.0 2.0
µA
0.5 1.0
8.0 20.0
µA
5.0 12.0
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