Real time clock module
Epson Toyocom
Product Number (Please contact us)
RX-8571SA : X1B000071xxxx00
RX-8571NB : X1B000061xxxx00
RX-8571LC : X1B000051xxxx00
Low current consumption
I
2
C-Bus INTERFACE REAL TIME CLOCK MODULE
RX - 8571 SA
/
NB
/
LC
•
Built-in frequency adjusted 32.768 kHz crystal unit.
•
Interface Type
:
I
2
C-Bus Interface (400 kHz)
•
Operating voltage range
:
1.6 V to 5.5 V
•
Wide Timekeeper voltage range
:
1.3 V to 5.5 V
•
Low backup current
:
220 nA (Typ.) / 3 V
•
32.768 kHz frequency output function
:
C-MOS output With Control Pin
•
User RAM
:
128 bit
•
The various functions include full calendar, alarm, timer,etc.
(Long-running timer : 65535 hours)
*
The I
2
C-Bus is a trademark of NXP Semiconductors
Actual size
RX-8571SA
RX-8571NB
RX-8571LC
Block diagram
( 32.768 kHz )
Overview
•
32.768 kHz frequency output function
!
FOE pin enable output on/off control.
!
Output frequency can be selected
as 32.768 kHz, 1024 Hz, 1 Hz.
•
Timer Function
!
Timer function can be set up between
1/4096 second and 65535 hours.
!
Timing period are 1 h, 1 min, 64 Hz, 4096 Hz.
!
It is recorded automatically to TF-bit at the time of
event occurs, and possible to output with /IRQ pin
output.
•
Alarm function
!
Alarm function can be set to day of week,
day, hour, or minute.
!
It is recorded automatically to AF-bit at the time of
event occurs, and possible to output with /IRQ pin
output.
•
Built-in RAM
!
128 bit (16 word x 8 bit)
XD
OSC
XG
DIVIDER
FOUT
CONTROLLER
CLOCK
and
CALENDAR
FOE
FOUT
TIMER REGISTER
INTERRUPTS
/ IRQ
CONTROLLER
ALARM REGISTER
/BM
DAS
SDA
SCL
INTERFACE
CIRCUIT
CONTROL
REGISTER
and
SYSTEM
CONTROLLER
USER REGISTER
128 bit (16 word x 8 bit)
Terminal connection / External dimensions
RX
−
8571 SA
1.
2.
3.
4.
5.
6.
7.
GND
N.C.
DAS
SCL
5.0
1.27
(Unit:mm)
RX
−
8571 NB
0.5
RX
−
8571 LC
22.
21.
6.3
Max.
14.
0.2
FOUT
N.C.
N.C.
N.C.
/ IRQ
N.C.
V
DD
1.
2.
3.
4.
5.
6.
7.
8.
9.
10.
11.
FOE
/BM
(GND)
SDA
SCL
DAS
GND
N.C.
FOUT
/IRQ
V
DD
SON
−
22 pin
5.0
±
0.2
4.8
1.3
±
0.1
N.C.
N.C.
N.C.
N.C.
N.C.
N.C.
N.C.
N.C.
N.C.
−
−
10.1
±
12.
11.
10.
19.
18.
17.
16.
15.
14.
13.
12.
3.
4.
5.
6.
SDA
SCL
DAS
GND
2.8
2.4
3.6
13.
20.
2.
/BM
0.5
1.
FOE
12.
11.
10.
9.
1.2
M ax.
V
DD
N.C.
N.C.
N.C.
/IRQ
FOUT
SDA
3.2
±
0.1
/BM
FOE
7.4
±
0.2
9.
8.
8.
7.
SOP - 14 pin
VSOJ
−
12pin
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
∗
Refer to application manual for details.
"
Current consumption characteristics
Typ.
3.0
3.0
+25
Max.
5.5
5.5
+85
Unit
V
V
°
C
Symbol
V
DD
V
CLK
T
OPR
Condition
-
-
-
Min.
1.6
1.3
-40
Item
Symbol
Condition
FOE=/BM=”L”
FOUT= OFF
/IRQ = OFF
V
DD
=3.0V
Ta= +25
°
C
LC
type
SA/NB
type
Min.
Typ.
220
Max.
400
Unit
nA
200
400
"
Frequency characteristics
Item
Frequency
tolerance
Oscillation
start up time
Symbol
∆
f/f
t
STA
Condition
T
a
= +25
°
C
V
DD
= 3.0 V
T
a
= +25
°
C
V
DD
= 1.6 V
Rating
5
±
23
∗
1 Max.
Unit
×
10
−
6
s
Current
Consumption
I
DD
FOE=/BM=”L”
FOUT= OFF
/IRQ = OFF
V
DD
=3.0V
Ta= -40
°
C to +85
°
C
550
nA
∗
Please ask for tighter tolerance. ( Equivalent to 1 minute of monthly deviation )
http://www.epsontoyocom.co.jp
EPSONTOYOCOM [ EPSON TOYOCOM ]
