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RS5C372A-E2-F Datasheet(PDF) 37 Page - RICOH electronics devices division |
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RS5C372A-E2-F Datasheet(HTML) 37 Page - RICOH electronics devices division |
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37 / 57 page  RS5C372A/B 36 2. Configuration of Oscillating Circuit and Time Trimming 2.1 Configuration of Oscillating Circuit 8 7 6 RS5C372A/B RF RD CD CG OSCIN OSCOUT 32kHz VDD VDD A Typical external device: X'tal: 32.768kHz or 32.000kHz (R1 30k Typ.) (CL 6pF to 8pF) Typical values of internal devices: RF 15M (Typ.) RD 60k (Typ.) CG, CD 10pF (Typ.) The oscillation circuit is driven at a constant voltage of about 1.2V relative to the Vss level. Consequently, it generates a wave form having a peak-to-peak amplitude of about 1.2V on the positive side of the Vss level. Considerations on Crystal Oscillator Basic characteristics of a crystal oscillator includes R1 (equivalent series resistance: ease of oscillation) and CL (load capacitance: rank of center frequency). R1 Typ. of 30k, CL6 to 8pF is recommended for the RS5C372A/B. Confirm recommended values to the manufacturer of the crystal oscillator used. Considerations in Mounting Components Surrounding Oscillating Circuit 1) Mount the crystal oscillators in the closest possible position to the IC. 2) Avoid laying any signal or power line close to the oscillation circuit (particularly in the area marked with “ A ” in the above figure). 3) Apply the highest possible insulation resistance between the OSCIN or OSCOUT pin and the PCB. 4) Avoid using any long parallel line to wire the OSCIN and OSCOUT pin. 5) Take extreme care not to cause condensation, which leads to various problems such as oscillation halt. Other Relevant Considerations 1) When applying an external input of clock pulses (32.768kHz or 32.000kHz) to the OSCIN pin: DC coupling : Prohibited due to mismatching of input levels. AC coupling : Permissible except that unpredictable results may occur in oscillator halt sensing due to possible sensing errors caused by noises, etc. 2) Avoid using the oscillator output of the RS5C372A/B (from the OSCOUT pin) to drive any other IC for the purpose of ensuring stable oscillation. |
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