RP5C01A 데이터 시트보기 (PDF) - RICOH Co.,Ltd.

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RP5C01A

REAL-TIME CLOCK WITH INTERNAL RAM

RICOH Co.,Ltd. 

RP/RF5C01A

OSCILLATOR CIRCUIT

• When the oscillator circuit is to be configured using crystal oscillators:

The oscillator circuit is configured as shown in Figure 1.

External components include: a resistor, a capacitor and a trimmer capacitor for fine tuning of the frequency.

Adjust the trimmer capacitor (16Hz or 1Hz signal output from the ALARM pin is used) to correct oscillation fre-

quency.

Correction with 16Hz signal:

Set addresses (A3, A2, A1, A0)=(1, 1, 1, 1).

Set Data (D3, D2, D1, D0)=(1, 0, 0, ´).

Correction with 1Hz signal:

Set addresses (A3, A2, A1, A0)=(1, 1, 1, 1).

Set Data (D3, D2, D1, D0)=(0, 1, 0, ´).

In each case, set addresses (A3, A2, A1, A0)=(1, 1, 0, 1), and set data (D3, D2, D1, D0)=(´, 0, ´, ´) to disable

ALARM output before setting 16Hz or 1Hz signal.

RP/RF5C01A

C1

OSCIN

16

R

17

C2

OSCOUT

C1=5pF to 30pF

C2=30pF

R=100kW

(Crystal from Nihon Denpa Kogyo : MX38T)

GND

*) Values of C1, C2 and R are not absolute conditions but are indicated for reference only. Regard those C1, C2 and R values shown above as our

optimum values in our experiments which employed MX38T.

Difference between the RP5C01 and the RP/RF5C01A

Since the RP5C01 and the RP/RF5C01A have different oscillator circuit characteristics, approximately 12 to

19ppm (31 to 41 seconds/month) of difference will result if the RP/RF5C01A are used with an external value

that has been set to the RP5C01 oscillating characteristics. Therefore, determine a new external value for the

RP/RF5C01A.

7

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