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전자부품 데이터시트 검색엔진 |
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전자부품 데이터시트 검색엔진 |
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TLE9461ES 데이터시트(PDF) 43 Page - Infineon Technologies AG |
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TLE9461ES 데이터시트(HTML) 43 Page - Infineon Technologies AG |
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43 / 140 page  TLE9461ES Lite CAN SBC Family System Features Datasheet 43 Rev.1.1 2019-09-27 5.5 Spread Spectrum Modulation Frequency Function The spread spectrum modulation frequency function can be used to reduce electromagnetic emissions for the charge pump. The spread spectrum function can be enabled and configured by the bits SS_MOD_FR. The spread spectrum function is derived from the internal 2MHz oscillator (~0.5µs period). The calculations below are applied to the 2.0MHz setting (2MHZ_FREQ = ‘001’ (for all the other frequencies the values can be derived). There is a counter adjusting the oscillator step values up and down. There is a maximum of 32 steps for the counter available. For the frequency range 2MHZ_FREQ = ‘0xx’ we can choose following modulation frequencies: Table 13 Deriving the Modulation Frequency Steps Setting Periods / Step Width Typ. Resulting Period Typ. Modulation Frequency SS_MOD_FR = ‘11’ 0.5us / 1 period of 0.5us 16us 1/16us = 62.5 kHz SS_MOD_FR = ‘10’ 1.0us / 2 periods of 0.5us 32us 1/32us = 31.25 kHz SS_MOD_FR = ‘01’ 2.0us / 4 periods of 0.5us 64us 1/64us = 15.625 kHz |
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