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R2061S02-E2 Datasheet(PDF) 4 Page - RICOH electronics devices division

Part # R2061S02-E2
Description  wire interface Real-Time Clock ICs with Battery Backup switch-over Function
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Manufacturer  RICOH [RICOH electronics devices division]
Direct Link  http://www.ricoh.com
Logo RICOH - RICOH electronics devices division

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R2061 series
4
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 5.5 volts 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 SIO pin.
Allows a maximum input voltage of
5.5 volts regardless of supply voltage.
SIO
Serial
Input / Output
The SIO pin is used to input or output data intended for writing or reading in
synchronization with the SCLK pin.
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. Nch. open drain output.
VCC
Main Battery
input
Supply power to the IC.
VSB
Power Supply
Input for Backup
Battery
Connect a primary battery for backup. Normally, power is supplied from VCC
to the IC. If VCC level is equal or less than –VDET1, power is supplied from this
pin.
OSCIN
OSCOUT
Oscillation
Circuit
Input / Output
The OSCIN and OSCOUT pins are used to connect the 32.768-kHz quartz
crystal unit (with all other oscillation circuit components built into the R2061
series).
VDD
Positive Power
Supply Input
The VDD pin is connected to the power supply. Connect a capacitor as much
as 0.1
µF between VDD and VSS. In the case of using a secondary battery,
connecting the secondary battery to this pin is possible.
VDCC
VCC Power
Supply Monitoring
Result Output
While monitoring VCC Power supply, if the voltage is equal or lower than
–VDET1, this output level is “L”. When VDCC becomes “L”, SW1 turns off
and SW2 turns on. As a result, power is supplied from VSB pin to the internal
real time clock. When VCC is equal to +VDET1 or more, SW1 turns on and
SW2 turns off. After t DELAY passed, VDCC output becomes off, or “H”.
Nch Open-drain output.
CIN
Noise Bypass Pin
To stabilize the internal reference, connect a capacitor as much as 0.1uF
between this pin and VSS.
VSS
Negative Power
Sup Supply Input
The VSS pin is grounded.


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