Terminal Description; Examples Of External Connection - Epson RX8130 CE Applications Manual

RX8130CE

3. Terminal description

3.1. Terminal connections
3.2. Pin Functions
Signal
I/O
name
SCL Input
SDA Bi-directional
FOUT Output
Open-Drain
/ RST
Output
Open-Drain
/ IRQ
Output

V
DD

V
IO

V
OUT

V
BAT

GND
Note: Connect a bypass capacitor rated at least 0.1μF between power supply pins and GND pin.
Note: Input pins are able to input up to 5.5V regardless of V
Note: Open drain pins are able to Pull-up to 5.5V regardless of V
Note: Use the FOUT, /RST, /IRQ terminals as OPEN when not in use.
4.

Examples of external connection

4.1. Examples of power supply connection
(1) Case of different I/F voltage
and charge vlotage
VD1.8
V
IO
0.1F
V
DD
0.1F
V
OUT
V
BAT
0.1F

1. V
IO
2. SCL
3. SDA
4. FOUT
5. /RST
Serial clock input pin.
Data input and output pin.
Frequency output pin with output control function. (CMOS)
Output frequency can be selected as 32.768kHz, 1024Hz, 1Hz.
Even in the backup mode, this pin can opperate. In case of V
reset signal is outputted.
In case of V voltage rise detection, it releases the reset signal after 60ms.
DD
Interrupt output by Alarm and Timer events.(N-ch open drain)
This pin can output even a backup mode.
This is a power-supply pin for the internal logic.
This is a interface power supply pin. (There is an level shifter between VDD and VIO)
Internal voltage output pin.
Connect smoothing capacitor of 1.0uF
This is a power supply pin for backup battery.
This is a pin to connect a large-capacity capacitor, a secondary battery, and a primary
battery.
In a backup mode, the voltage is supplied inside by this pin.
Connected to a ground.
(2) Same I/F voltage and
charge voltage
(CHGEN=1, INIEN=1)
VD3
1.0F
R
EDLC
or
secondary
battery
RX8130CE
10. V
BAT
9. V
OUT
8. V
DD
7. GND
6. /IRQ
Function
applied voltage.
IO
applied voltage.
IO
VD3 VD3
V
IO
0.1F
V
DD
V
OUT
1.0F
V
BAT
R
0.1F
EDLC
or
secondary
battery
Page2
voltage drop detection, a
DD
(3) Primary battery as backup
(CHGEN=0)
VD3
V
IO
0.1F
V
DD
V
OUT
1.0F
V
BAT
R
0.1F
Primary
battery
ETM50E-05
