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ATSAMD20E14A-AU Datasheet(PDF) 16 Page - ATMEL Corporation |
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ATSAMD20E14A-AU Datasheet(HTML) 16 Page - ATMEL Corporation |
16 / 25 page 16 Atmel SAM D20 [DATASHEET Summary] 42129JS–SAM–12/2013 8. Packaging Information 8.1 Thermal Considerations 8.1.1 Thermal Resistance Data Table 8-1 summarizes the thermal resistance data depending on the package. Table 8-1. Thermal Resistance Data 8.1.2 Junction Temperature The average chip-junction temperature, T J, in °C can be obtained from the following equations: Equation 1 Equation 2 where: θ JA = package thermal resistance, Junction-to-ambient (°C/W), provided in Table 8-1 θ JC = package thermal resistance, Junction-to-case thermal resistance (°C/W), provided in Table 8-1 θ HEATSINK = cooling device thermal resistance (°C/W), provided in the manufacturer datasheet P D = device power consumption (W) T A = ambient temperature (°C) From “Equation 1” , the user can derive the estimated lifetime of the chip and decide if a cooling device is necessary or not. If a cooling device is to be fitted on the chip, “Equation 2” should be used to compute the resulting average chip- junction temperature T J in °C. Package Type θ JA θ JC 32-pin TQFP 68 °C/W 25.8 °C/W 48-pin TQFP 78.8 °C/W 12.3 °C/W 64-pin TQFP 66.7 °C/W 11.9 °C/W 32-pin QFN 37.2 °C/W 3.1 °C/W 48-pin QFN 33 °C/W 11.4 °C/W 64-pin QFN 33.5 °C/W 11.2 °C/W T J T A P D θ JA × () + = T J T A P D θ HEATSINK θ JC + () × () + = |
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