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STM32F405 Datasheet(PDF) 106 Page - STMicroelectronics |
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STM32F405 Datasheet(HTML) 106 Page - STMicroelectronics |
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106 / 204 page  Electrical characteristics STM32F405xx, STM32F407xx 106/203 DS8626 Rev 9 5.3.11 PLL spread spectrum clock generation (SSCG) characteristics The spread spectrum clock generation (SSCG) feature allows to reduce electromagnetic interferences (see Table 44: EMI characteristics). It is available only on the main PLL. Equation 1 The frequency modulation period (MODEPER) is given by the equation below: MODEPER round fPLL_IN 4fMod × () ⁄ [] = fPLL_IN and fMod must be expressed in Hz. As an example: If fPLL_IN = 1 MHz, and fMOD = 1 kHz, the modulation depth (MODEPER) is given by equation 1: MODEPER round 10 6 410 3 × () ⁄ [] 250 == Equation 2 Equation 2 allows to calculate the increment step (INCSTEP): INCSTEP round 2 15 1 – () md PLLN × × () 100 5 × MODEPER × () ⁄ [] = fVCO_OUT must be expressed in MHz. IDD(PLLI2S)(4) PLLI2S power consumption on VDD VCO freq = 100 MHz VCO freq = 432 MHz 0.15 0.45 - 0.40 0.75 mA IDDA(PLLI2S)(4) PLLI2S power consumption on VDDA VCO freq = 100 MHz VCO freq = 432 MHz 0.30 0.55 - 0.40 0.85 mA 1. Take care of using the appropriate division factor M to have the specified PLL input clock values. 2. Guaranteed by design. 3. Value given with main PLL running. 4. Guaranteed by characterization. Table 37. PLLI2S (audio PLL) characteristics (continued) Symbol Parameter Conditions Min Typ Max Unit Table 38. SSCG parameters constraint Symbol Parameter Min Typ Max(1) Unit fMod Modulation frequency - - 10 KHz md Peak modulation depth 0.25 - 2 % MODEPER * INCSTEP - - 215 −1- 1. Guaranteed by design. |
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