RA-8581SA Datasheet, PDF (1/2 Pages) Epson ToYoCom – I2C-Bus INTERFACE REAL TIME CLOCK MODULE

Real time clock module
Epson Toyocom
For Automotive
I²C-Bus INTER FACE REAL TIME C LOCK MOD ULE
RA - 8581 SA
•Built-in frequency adjusted 32.768 kHz crystal unit.
•Interface Type
: I²C-B us Interface (400 kHz)
•Operating voltage range
: 1.8 V to 5.5 V
•Wide Timekeeper voltage range : 1.6 V to 5.5 V
•Low backup current
: 0.45 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
* The I²C-Bus is a trademark of NXP Semiconductors
Product Number (Please contact us)
RA-8581SA : Q41A88151xxxx00
Block diagramç
32.768 kHz
OSC
FOUT
FOE
/ INT
DIVIDER
FOUT
CONTROLLER
INTE RRUPTS
CONTROLLER
SCL
SDA
I²C-BUS
INTERFACE
CIRCUIT
CLOCK
and
CALENDAR
TIMER
REGISTER
ALARM
REGISTER
CONTROL
REGISTER
and
SYSTEM
CONTROLLER
ç ç ç Overviewç
ç
• Interface Type
• I²C-Bus interface. ( Hi-s peed bus specifications 400 kHz )
∗ I²C-Bus slave address : read A3h and write A2h
• 32.768 kHz frequency output function
• FOUT pin output (C-MOS output ), CL=30 pF
• 32.768 kHz clock frequency output. (Duty 50 ±5%)
• Timer function
• Timer interrupt 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
(N-ch open-drain output).
• Interrupt function
• Alarm interrupt function, Time update interrupt function.
Pin Functionç
ç ç ç Terminal connection / External dimensionsç (Unit:mm) ç
Signal Name
SCL
SDA
FOUT
FOE
/INT
VDD
GND
Input / Output
Input
Bi- dir ectional
Function
Serial clock input pin
Data input and output pin
Output
Input
FOUT pin outputs the reference clock signal at 32.768 kHz.
FOE pin inputs the FOUT output control.
F O E pin
inp u t
F O U T pin
o utp ut
HIG H
O utpu t ( C -M O S )
LO W
OFF
( LOW )
Output
-
-
Interrupt output ( N-ch open drain )
Connected to a positive power supply.
Connected to a ground.
RA − 8581 SA
1. N.C.
2. SCL
14. FOUT
13. N.C.
3. SDA
12. N.C.
4. N.C.
5. GND
11. VDD
5.0
10. FOE
6. N.C.
7. / INT
7 .4 ± 0 .2
SOP − 14 pin
9. N.C.
8. N.C.
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
Con dition
Min.
Power voltage
VD D
-
1.8
Clock voltage
VCLK
-
1.6
Oper atin g
temperature
TOPR
-
-40
! Frequency characteristics
Item
Symbol
Condition
Freq uenc y
t oleran ce
∆f/f
Ta = +25 °C
VDD = 3.0 V
FOUT output Duty tw / t
Ta = -40 °C to +85 °C
VDD = 2.4 V to 5.5 V
∗ _{Equivalent to 1 minute of monthly deviation}
Typ. Max.
3.0 5.5
3.0 5.5
+25 +85
Rating
5 ± 23 ^∗
50 ± 5
Unit
V
V
°C
Unit
× 10^−6
%
∗ Refer to application manual for details.
! Current consumption characteristics
Item Symbol
Condition
Min.
Current
C onsu mpti on
fSCL = 0 Hz
FOE = GND
IBK
FOUT ;Output OFF
( LOW )
VD D
=5V
VD D
=3V
fSCL = 0 Hz
FOE = VDD
VD D
=5V
I32k _{FOUT ;}
VD D
32.768 kHz Output ON _{= 3 V}
CL = 30 pF
T a = -40 °C to +85 °C
Typ. Max. Unit
0.65 1.2
µA
0.45 0.8
8.0 20.0
µA
5.0 12.0
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