RX-8025SA Datasheet, PDF (1/2 Pages) Epson ToYoCom – I2C-Bus INTERFACE REAL TIME CLOCK MODULE

Real time clock module
High-Stability
I²C-Bus INTER FACE REAL TIME C LOCK MODU LE
RX - 8025 SA / NB
•Built-in 32.768 kHz crystal unit
: Frequency adjusted for high accuracy
(± 5 ×10^−6 / Ta = +25 °C)
•Interface Type
: I²C-Bus Interface (400 kHz)
•Operating voltage range: 1.70 V to 5.5 V
•Wide Timekeeper voltage range
: 1.15 V to 5.5 V
•Various detection Functions
: Ex. Oscillation stop detection function
•Low backup current
: 0.48 µA / 3 V (Typ.)
•32.768 kHz frequency output function : C-MOS output With Control Pin
•The various functions include full calendar, alarm, timer.
Actual size
RX-8025SA
* The I²C-Bus is a trademark of NXP Semiconductors
Epson Toyocom
Product Number (Please contact us)
RX-8025SA : Q41802551xxxx00
RX-8025NB : Q41802591xxxx00
RX-8025NB
Block diagramç
FOUT
FOE
/ INTA
/ INTB
32 kHz
O ut put
Control
Comparator_W
Comparator_D
Alarm_W Register
( Min,Hour,W eek )
Alarm_D Regi ster
( Min,Hour )
Volt age
Det ec t
OSC
Divider
Correc
D iv.
-tion
Time Counter
( Sec,Min,Hour,Week,Day,Month,Year )
OSC
Detect
Interrupt Control
A ddr ess
D ecod er
Address
Register
Shift Register
I/O
Control
ç ç ç Overviewç
ç
• Features built-in 32.768 kHz crystal unit
• Frequency adjus ted for high accuracy.
( ± 5 ×10^−6 / Ta = +25 °C )
VDD
( Equivalent to 13 s econds of monthly deviation )
• The various detection function
• Power s upply voltage monitoring function
(with selectable detection threshold )
• Stop detection function
• Power-on reset detection function
• Alarm function and Timer function
SCL
• Timer function produces a periodic interruption signal.
As for the Alarm function an optional combination is produced.
(Date of the week , time , minute)
SD A
GN D
Pin Functionç
Signal
Name
SCL
SDA
FOUT
FOE
/ INTA
/ INTB
TEST
VDD
GND
Input / output
Function
Input
Bi-directional
Output
Input
Serial clock input pin
Data input and output pin
32.768 kHz clock output pin with the output
control function. (C-MOS)
FOE /CLEN1 /CLEN2
inpu t
bit
b it
FO UT
o utp ut
L
X
X
OFF ( LOW )
0
0
32.768 kHz
H
0
1
1
0
32.768 kHz
32.768 kHz
1
1
OFF(LOW )
Output
Output
-
-
-
Interrupt output A pin ( N-ch open drain )
Interrupt output B pin ( N-ch open drain )
∗ Used by the manufacture for testing.
(Do not connect externally.)
Connected to a positive power supply.
Connected to a ground.
ç ç ç Terminal connection / External dimensionsç
(Unit:mm) ç
1. N.C.
2. SCL
3. FOUT
4. N.C.
5. TEST
6. VDD
7. FOE
RX − 8025 SA
5.0
7 .4 ± 0 .2
SOP − 14 pin
14. N.C.
13. SDA
12. / INTB
11. GND
10. / INTA
9. N.C.
8. N.C.
1. FOE
2. VDD
3. (GND)
4. TEST
5. FOUT
6. SCL
7. SDA
8. / INTB
9. GND
10. / INTA
11. N.C.
RX − 8025 NB
22. ^N.C.
21. N.C.
20. N.C.
19. N.C.
18. N.C.
17. ^N.C.
4.8
16. N.C.
15. ^N.C.
1.3 ± 0.1 _{14. N.C.}
5.0 ± 0. 2
13. −
12. ^−
SON − 22 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
VDD
VCLK
TOPR
Condition
-
-
-
Min. Typ. Max.
1.7
3.0 5.5
1.15 3.0 5.5
−40 +25 +85
! Frequency characteristics
Item
Symbol
Condition
Range
Frequency
tolerance
Oscillation
start-up time
Frequency voltage
characteristics
∆_f/f
tSTA
f/V
Ta = +25 °C
VDD = 3.0 V
Ta = +25 ^°C
VDD = 2.0 V
Ta = +25 °C
VDD = 2.0 V to 5.5 V
AA: 5 ± 5 ^∗1)
AC: 0 ^± 5 ^∗2)
1 Max.
± 1 Max.
∗1) ∗2) Equivalent to 13 seconds of monthly deviation (excluding offset).
Unit
V
V
°C
Unit
× ₁₀^−6
s
× 10^−6
∗ Refer to application manual for details.
! Current consumption characteristics
Ta = −40 °C to +85 °C
Item
Symbol
Condition
Min. Typ. Max. Unit
Curent
Consumption
fSCL = 0Hz
IBK ^{FOE = GND}
FOUT ; output
VDD
=5V
VDD
OFF(LOW)
=3V
fSCL = 0Hz
VDD, FOE = 5.5 V V^DD
I32k _{FOUT ; output ON} = 5.5 V
( Output=OPEN;
CL = 0 pF )
0.60 1.80
µA
0.48 1.20
3.0 6.5 µA
! Power supply detection voltage
Item
Symbol
Condition
Ta = −30 °C to +70 °C
Min. Typ. Max. Unit
High-voltage mode
VDET H
VDD pin
1.90 2.10 2.30 V
Low-voltage mode
VDET L
VDD pin
1.15 1.30 1.45 V
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