R2025S/D
PIN DESCRIPTION
Symbol
Item
Description
SCL
Serial
Clock Line
The SCL pin is used to input clock pulses synchronizing the input and
output of data to and from the SDA pin. Allows a maximum input
voltage of 5.5 volts regardless of supply voltage.
SDA
Serial
Data Line
The SDA pin is used to input or output data intended for writing or
reading in synchronization with the SCL pin. Up to 5.5v beyond VDD
may be input. This pin functions as an N-ch open drain output.
The /INTRA pin is used to output alarm interrupt (Alarm_D) and output
periodic interrupt signals to the CPU signals. Disabled at power-on
from 0V. N-ch. open drain output.
The /INTRA pin is used to output alarm interrupt (Alarm_W) and output
periodic interrupt signals to the CPU signals. Disabled at power-on
from 0V. N-ch. open drain output.
The 32KOUT pin is used to output 32.768-kHz clock pulses. Enabled
at power-on from 0 volts. CMOS output. The output is disabled and
held “L” when CLKC pi set to “L” or open, or certain register setting.
This pin is enabled at power-on from 0v.
/INTRA
/INTRB
32KOUT
Interrupt
Output A
Interrupt
Output B
32K Clock
Output
CLKC
Clock control
input
The CLKC pin is used to control output of the 32KOUT pin. The clock
output is disabled and held low when the pin is set to low or open.
Incorporates a pull-down resistor.
VDD
VSS
Positive Power
Supply Input
Negative Power
Supply Input
Test input
The VDD pin is connected to the power supply.
The VSS pin is grounded.
VPP
N.C.
This pin is power pin for testing in the factory. Don’t connect to any lines.
These pins are not connected to internal IC chip.
No Connection
In R2025D (SON22), N.C. pins from 14 pin to 22 pin are connected
together internally. Never connect these pins to any lines, or connect to
VDD or VSS. And never connect different voltage level lines each other.
3
RICOH [ RICOH ELECTRONICS DEVICES DIVISION ]
