Table of Contents
Advertisement
RX - 8581 SA
JE
/
3. Terminal description
3.1. Terminal connections
RX - 8581 SA
SOP 14 pin
# 1
# 7
No. Pin terminal No. Pin terminal
1
N.C.
14
2
SCL
13
3
SDA
12
4
N.C.
11
5
GND
10
6
N.C.
9
7
8
/ INT
3.2. Pin Functions
Signal
I/O
name
SCL
I
SDA
I/O
FOUT
O
FOE
I
/INT
O
V
DD
(V
)
DD
GND
N.C.
Note: Be sure to connect a bypass capacitor rated at least 0.1 µF between V
NB
/
RX - 8581 JE
# 14
# 1
# 10
# 8
No. Pin terminal No. Pin terminal
FOUT
1
N.C.
N.C.
2
N.C.
N.C.
3
FOE
V
4
V
DD
DD
FOE
5
FOUT
N.C.
6
SCL
N.C.
7
SDAT
8
( V
DD
9
GND
10
/ INT
This is the serial clock input pin for I
This pin's signal is used for input and output of address, data, and ACK bits,
synchronized with the serial clock used for I
Since the SDA pin is an N-ch open drain pin during output, be sure to connect a suitable
pull-up resistance relative to the signal line capacity.
This is the C-MOS output pin with output control provided via the FOE pin.
When FOE = "H" (high level), this pin outputs a 32.768-kHz signal.
When output is stopped, the FOUT pin = "L" (low level).
This is an input pin used to control the output mode of the FOUT pin.
When this pin's level is high, the FOUT pin is in output mode. When it is low, output via the
FOUT pin is stopped.
This pins is used to output alarm signals, timer signals, time update signals, and other
signals. This pin is an open drain pin.
This pin is connected to a positive power supply.
Although this pin has the same potential as V
This pin is connected to a ground.
This pin is not connected to the internal IC.
Leave N.C. pins open or connect them to GND or V
(Note) Note with caution that in the RX-8581NB (SON-22 pin), the N.C. pins (pins 14 to
22) are interconnected via the internal frame.
VSOJ 20 pin
# 14
# 11
20
N.C.
19
N.C.
18
N.C.
17
N.C.
16
N.C.
15
N.C.
14
N.C.
)
13
N.C.
12
N.C.
11
N.C.
Function
2
C Bus communications.
2
C communications.
DD,
and GND.
DD
Page - 2
RX - 8581 NB
SON 22 pin
# 1
# 11
No. Pin terminal No. Pin terminal
1
/ INT
22
N.C.
2
GND
21
N.C.
3
( V
)
20
N.C.
DD
4
N.C.
19
N.C.
5
SDA
18
N.C.
6
SCL
17
N.C.
7
FOUT
16
N.C.
8
V
15
N.C.
DD
9
FOE
14
N.C.
10
N.C.
(13)
11
N.C.
(12)
it should not be connected externally.
.
DD
# 14
(#12)
MQ372-02
Advertisement
Table of Contents
