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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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SC312XDP512F0MPVR датащи(PDF) 1242 Page - Freescale Semiconductor, Inc |
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SC312XDP512F0MPVR датащи(HTML) 1242 Page - Freescale Semiconductor, Inc |
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1242 / 1348 page  Appendix A Electrical Characteristics MC9S12XDP512 Data Sheet, Rev. 2.21 1244 Freescale Semiconductor A.1.8 Power Dissipation and Thermal Characteristics Power dissipation and thermal characteristics are closely related. The user must assure that the maximum operating junction temperature is not exceeded. The average chip-junction temperature (TJ) in °C can be obtained from: The total power dissipation can be calculated from: Two cases with internal voltage regulator enabled and disabled must be considered: 1. Internal voltage regulator disabled PIO is the sum of all output currents on I/O ports associated with VDDX and VDDR. For RDSON is valid: respectively 2. Internal voltage regulator enabled IDDR is the current shown in Table A-10. and not the overall current flowing into VDDR, which additionally contains the current flowing into the external loads with output high. PIO is the sum of all output currents on I/O ports associated with VDDX and VDDR. T J T A P D Θ JA • () + = T J Junction Temperature, [ °C ] = T A Ambient Temperature, [ °C ] = P D Total Chip Power Dissipation, [W] = Θ JA Package Thermal Resistance, [ °C/W] = P D P INT P IO + = P INT Chip Internal Power Dissipation, [W] = P INT I DD V DD ⋅ I DDPLL V DDPLL ⋅ I DDA +V DDA ⋅ + = P IO R DSON i ∑ I IO i 2 ⋅ = R DSON V OL I OL ------------ for outputs driven low ; = R DSON V DD5 V OH – I OH ------------------------------------ for outputs driven high ; = P INT I DDR V DDR ⋅ I DDA V DDA ⋅ + = P IO R DSON i ∑ I IO i 2 ⋅ = |
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