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R2045S Datasheet(PDF) 3 Page - RICOH electronics devices division

Part No. R2045S
Description  4-wire Serial Interface Real Time Clock Module
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Maker  RICOH [RICOH electronics devices division]
Homepage  http://www.ricoh.com
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R2045S Datasheet(HTML) 3 Page - RICOH electronics devices division

 
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R2045S/D
3
PIN DESCRIPTION
Symbol
Item
Description
CE
Chip enable
Input
The CE pin is used for interfacing with the CPU.
Should be held high to
allow access to the CPU.
Incorporates a pull-down resistor.
Should be
held low or open when the CPU is powered off.
Allows a maximum input
voltage of 5.5v regardless of supply voltage.
SCLK
Serial Clock
Input
The SCLK pin is used to input clock pulses synchronizing the input and
output of data to and from the SI and SO pins.
Allows a maximum input
voltage of 5.5v regardless of supply voltage.
SI
Serial Input
The SI pin is used to input data intended for writing in synchronization with
the SCLK pin. CMOS input.
Allows a maximum input voltage of 5.5v
regardless of supply voltage.
SO
Serial
Output
The SO pin is used to output data intended for reading in synchronization
with the SCLK pin. CMOS output.
INTR
Interrupt
Output
The INTR pin is used to output alarm interrupt (Alarm_W) and alarm
interrupt (Alarm_D) and output periodic interrupt signals to the CPU signals.
Disabled at power-on from 0V. N-channel open drain output.
Allows a
maximum pull-up voltage of 5.5v regardless of supply voltage.
32KOUT
32kHz Clock
Output
The 32KOUT pin is used to output 32.768-kHz clock pulses. And controlled
by resister setting.
When VDD power-on from 0v, this output is enabled.
The pin is N-channel open drain output.
Allows a maximum pull-up voltage
of 5.5v regardless of supply voltage.
VDD
Positive
Power
Supply Input
The VDD pin is connected to the power supply.
VSS
Negative
Power
Supply Input
The VSS pin is grounded.
VPP
Test input
This pin is power pin for testing in the factory. Please don’t connect to any
other pins.
N.C.
No
Connection
These pins are not connected to internal IC chip.
In R2045D (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.


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