RS5C313 Просмотр технического описания (PDF) - RICOH Co.,Ltd.

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производитель

RS5C313

ULTRA-COMPACT REAL-TIME CLOCK IC

RICOH Co.,Ltd. 

RS5C313

PIN DESCRIPTIONS

Pin No. Symbol

Name

1 CE

Chip enable input

2 SCLK Shift clock input

3 SIO

Serial input

and output

5 INTR Interrupt output

7 OSCIN Oscillation circuit

6 OSCOUT input and output

8 VDD

4 VSS

Positive power

supply input

Negative power

supply input

Description

The CE pin is used to interface with the CPU and is accessible when held at the high

level. This pin incorporates a pull-down resistor. It should be switched to the low lev-

el or opened when not accessed or when powering off the system. Holding the CE

pin at the high level for more than 2.5 seconds forces 1Hz interrupt pulses to be out-

put from the INTR pin for oscillation frequency measurement .

(No pulse is output for less than 1.5 seconds.)

The SCLK pin is used to input shift clock pulses to synchronize data input to, and

output from, the SIO pin.

The SIO pin inputs and outputs written or read data in synchronization with and out-

put shift clock pulses from the SCLK pin. The SIO pin causes high impedance when

the CE pin is held at the low level. After the CE pin is switched to the high level and

the control bits and the address bits are input from the SIO, the SIO pin performs

serial input and output operations

The INTR pin outputs cyclic interrupt pulses to the CPU. This pin functions as an

Nch open drain output even when the CE pin is held at the low level.

These pins configure an oscillation circuit by connecting a 32.768 kHz crystal

oscillator between the OSCIN and OSCOUT pins and by connecting a capacitor

between the OSCIN and VSS pins.

(Any other oscillation circuit components are built into the RS5C313.)

The VDD pin is connected to a power supply and the VSS pin is connected to the

ground.

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