Epson RX-8025SA - 3 Description of Pins; Pin Layout; Pin Functions

RX - 8025 SA / NB
Page - 2 ETM10E-04
3. Description of Pins
3.1. Pin Layout
RX - 8025 SA
1.
N.C.
14.
N.C.
2.
SCL
13.
SDA
3.
FOUT
12.
/ INTB
4.
N.C.
11.
GND
5.
TEST
10.
/ INTA
6.
VDD
9.
N.C.
7.
FOE
8.
N.C.
SOP - 14pin
RX - 8025 NB
1.
FOE 22. N.C.
2.
VDD 21. N.C.
3.
(GND)
20. N.C.
4.
TEST 19. N.C.
5.
FOUT 18. N.C.
6.
SCL 17. N.C.
7.
SDA 16. N.C.
8.
/ INTB 15. N.C.
9.
GND 14. N.C.
10.
/ INTA (13)
−
11.
N.C.
# 1
# 11
# 22
(#12)
(12)
−
SON - 22pin
3.2. Pin Functions
Signal
name
I / O Function
SCL I
This is the serial clock input pin for I
2
C communications. Data input and output across the
SDA pin is synchronized with this pin's clock signal.
Up to 5.5 V can be used for this input, regardless of the power supply voltage.
SDA I/O
This pin's signal is used for input and output of address, data, and ACK bits, synchronized
with the serial clock used for I
2
C communications.
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.
FOUT O
FOUT terminal is 32.768 kHz clock output terminal (C-MOS) that output control is possible.
FOE terminal is the input terminal controlling the output of FOUT pin with /CLEN1 and
/CLEN2 bit.
The output of FOUT terminal stops when /CLEN1bit and /CLEN2 bit both sets to "1".
FOUT output stops when FOE is Low or OPEN. Status of FOUT output stopped is " L ".
∗The logic table.
FOE
input
/CLEN1
bit
/CLEN2
bit
FOUT
output
L
Χ Χ
OFF ( " L " )
0 0 32.768 kHz
0 1 32.768 kHz
1 0 32.768 kHz
H
1 1
OFF ( " L " )
' Χ ' Don't care.
FOE terminal had pull-down resistor built-in and input voltage is possible regardless of
power supply voltage to 5.5 V.
FOE I
/INTA O
This interrupt output A pin is an N-ch open drain output.
It outputs alarm interrupts (Alarm_D) and periodic interrupts.
/INTB O
This interrupt output B pin is an N-ch open drain output.
It outputs alarm interrupts (Alarm_W).
TEST
−
This pin is used by the manufacturer for testing. Do not connect externally.
V
DD
−
This pin is connected to a positive power supply.
GND
−
This pin is connected to a ground.
(GND)
−
This pin has the same voltage level as GND. Do not connect externally.
N.C.
−
This pin is not connected to the internal IC.
However, note with caution that the RX-8025NB's N.C. pins (pins 14 to 22) are interconnected
via the internal frame.
Leave N.C. pins open or connect them to GND or V DD .
Note: Be sure to connect a bypass capacitor rated at least 0.1 µF between V DD and GND.