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MC9S12A128 Datasheet(PDF) 89 Page - Freescale Semiconductor, Inc |
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MC9S12A128 Datasheet(HTML) 89 Page - Freescale Semiconductor, Inc |
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89 / 140 page  Device User Guide — 9S12DT128DGV2/D V02.17 89 Freescale Semiconductor Section 23 Printed Circuit Board Layout Proposal The PCB must be carefully laid out to ensure proper operation of the voltage regulator as well as of the MCU itself. The following rules must be observed: • Every supply pair must be decoupled by a ceramic capacitor connected as near as possible to the corresponding pins (C1 – C6). • Central point of the ground star should be the VSSR pin. • Use low ohmic low inductance connections between VSS1, VSS2 and VSSR. • VSSPLL must be directly connected to VSSR. • Keep traces of VSSPLL, EXTAL and XTAL as short as possible and occupied board area for C7, C8, C11 and Q1 as small as possible. • Do not place other signals or supplies underneath area occupied by C7, C8, C10 and Q1 and the connection area to the MCU. • Central power input should be fed in at the VDDA/VSSA pins. Table 23-1 Suggested External Component Values Component Purpose Type Value C1 VDD1 filter cap ceramic X7R 100 … 220nF C2 VDD2 filter cap ceramic X7R 100 … 220nF C3 VDDA filter cap ceramic X7R 100nF C4 VDDR filter cap X7R/tantalum >= 100nF C5 VDDPLL filter cap ceramic X7R 100nF C6 VDDX filter cap X7R/tantalum >= 100nF C7 OSC load cap C8 OSC load cap C9 / CS PLL loop filter cap See PLL specification chapter C10 / CP PLL loop filter cap C11 / CDC DC cutoff cap Colpitts mode only, if recommended by quartz manufacturer R1 / R PLL loop filter res See PLL Specification chapter R2 / RB Pierce mode only R3 / RS Q1 Quartz |
Similar Part No. - MC9S12A128 |
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Similar Description - MC9S12A128 |
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