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RP5C01A Datasheet(PDF) 7 Page - RICOH electronics devices division |
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RP5C01A Datasheet(HTML) 7 Page - RICOH electronics devices division |
7 / 10 page RP/RF5C01A 7 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. C1 GND C2 OSCIN OSCOUT RP/RF5C01A 16 17 R C1=5pF to 30pF C2=30pF R=100k W (Crystal from Nihon Denpa Kogyo : MX38T) *) 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. |
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