RS5C317B 查看數據表（PDF） - RICOH Co.,Ltd.

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RS5C317B

ULTRA-COMPACT HIGH PERFORMANCE SERIAL REAL-TIME CLOCK ICs

RICOH Co.,Ltd. 

RS5C317A/B

PIN DESCRIPTIONS

Pin No. Symbol

Name

Description

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

level. This pin is connected to a pull-down resistor. It should be switched to the

low level or opened when not accessed or when powering off the system. Holding

1

CE Chip enable input

the CE pin high for more than 2.5 seconds forces 1Hz interrupt pulses to be output

from the INTR pin for oscillation frequency measurement. (No “1Hz pulse” is out-

put for less than 1.5 seconds.)

SCLK

(A type)

2

Shift clock input

SCLK

(B type)

This pin is used to input shift clock pulses to synchronize data input to, and output

from, the SIO pin. SCLK and SCLK are for writing data at falling and rising edge of

clock pulses respectively and also reading data at rising and falling edge of clock

pulses respectively.

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

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

3

SIO Serial input/output CE pin is held at the low level (CMOS input/output). 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 periodic interrupt pulses and alarm interrupt to the CPU.

8 INTR Interrupt output This pin functions as an Nch open drain output even when the CE pin is held at the

low level.

5 ALRM Alarm output

The ALRM pin outputs alarm interrupt to the CPU. This pin functions as an Nch

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

6 TMOUT Timer output

TMOUT pin outputs timer counter output pulses for watch-dog-timer and free-run-

timer. This pin functions as an Nch open drain output even when the CE pin is

held at the low level. Timer function is disabled and TMOUT is OFF state when

the RS5C317 is in the oscillation halt sensing state.

11 OSCIN Oscillator circuit

10 OSCOUT input/output

These pins configure an oscillator circuit by connecting a 32.768kHz crystal oscilla-

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

the OSCIN and Vss pins. (Any other oscillator circuit components are built into

the RS5C317A/B.)

13 32KOUT 32kHz output

32kHz clock output pin for peripheral circuit.

The 32kHz clock output is controlled by CLKC pin and 32kHz control register.

The 32KOUT pin outputs 32kHz clock when the CLKC pin is held at high and

CLEN=0, and this pin is held at high impedance state when the CLKC pin and

CLEN is in any other states and even when the CLKC pin is open. CMOS output.

Control input for Control pin for an output of the 32KOUT pin. This pin incorporates a pull-down-

4 CLKC

32kHz output

resistor.

14 VDD Positive/Negative

VDD and VSS is connected to power supply and ground respectively.

7

VSS power supply input

9, 12 NC No Connection

Ordinarily connected to VSS pin.

3

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