R2023K datasheet(44/50 Pages) RICOH

44 / 50 page

R2023K/T

• Connection of INTRA or INTRB Pin

The INTRA or INTRB pin follows the N-channel open drain output logic and contains no protective diode on the

power supply side.

As such, it can be connected to a pull-up resistor of up to 5.5v regardless of supply voltage.

VDD

OSCIN

OSCOUT

INTRA or INTRB

*1)

32768Hz

Backup power supply

System power supply

VSS

• Connection of 32KOUT Pin

As the 32KOUT pin is CMOS output, the supply voltage of the R2023K/T and any devices to be connected should

be the same.

When the device is powered down, the 32KOUT output pin should be disabled.

When the CLKC pin is connected to the system power supply through the pull-up resistor, the pull-up resistor

should be 0

Ω to 10kΩ, and the 32KOUT pin should be connect to the host device through the resistor (approx.

10k

Ω)

VDD

CLKC

VSS

Back-up Power Supply

CPU Power Supply

32KOUT

R3111

XXXXC

VDD

CPU

VSS

Back-up Power supply

CPU Power Supply

Approx.10K

Ω

32KOUT

0 to 10K

Ω

CLKC

*1) Depending

whether

the

INTRA

INTRB pin is used during battery backup, it

should be connected to a pull-up resistor at

the following different positions:

(1) Position A in the left diagram when it is not to

be used during battery backup.

(2) Position B in the left diagram when it is to be

used during battery backup.

R2023K Datasheet(PDF) 44 Page - RICOH electronics devices division

R2023K Datasheet(HTML) 44 Page - RICOH electronics devices division

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