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RV5C387A Datasheet(PDF) 32 Page - RICOH electronics devices division |
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RV5C387A Datasheet(HTML) 32 Page - RICOH electronics devices division |
32 / 49 page RV5C387A 32 2.3 Adjustment of Oscillation Frequency The oscillation frequency of the oscillation circuit can be adjusted by varying procedures depending on the usage of the RV5C387A in the system into which they are to be built and on the allowable degree of time count errors. The flow chart below serves as a guide to selecting an optimum oscillation frequency adjustment procedure for the relevant system. Start Use 32-kHz clock circuit? NO NO NO YES YES YES YES NO Use 32-kHz clock circuit without regard to its frequency precision? Allowable time count precision is on order of oscillation frequency variations of crystal oscillator *1 plus frequency variations of real-time clock? *2 *3 Allowable time count precision is on order of oscillation frequency variations of crystal oscillator *1 plus frequency variations of real-time clock? *2 *3 To Course (A) To Course (B) To Course (C) To Course (D) *1) Generally, crystal oscillators for commercial use are classified in terms of their center frequency depending on their load capacitance (CL) and further divided into ranks on the order of ±10, ±20, and ±50ppm depending on the degree of their oscillation frequency variations. *2) Basically, the RV5C387A is configured to cause frequency variations on the order of ±5 to ±10ppm at normal temperature. *3) Time count precision as referred to in the above flow chart is applicable to normal temperature and actually affected by the temperature characteristics and other properties of crystal oscillators. 2.2 Measurement of Oscillation Frequency Frequency counter 32.768kHz OSCIN OSCOUT VDD V SS 32KOUT RV5C387A *1) The RV5C387A is configured to generate 32.768-kHz clock pulses for output from the 32KOUT pin at power-on conditionally on setting the XSTP bit to 1 in the control register 2. *2) A frequency counter with 6 (more preferably 7) or more digits on the order of 1ppm is recommended for use in the measurement of the oscillation fre- quency of the oscillation circuit. *3) The 32KOUT pin should be connected to the VDD pin with a pull-up resistor. |
Similar Part No. - RV5C387A_03 |
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Similar Description - RV5C387A_03 |
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