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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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ATmega169P датащи(PDF) 329 Page - ATMEL Corporation |
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ATmega169P датащи(HTML) 329 Page - ATMEL Corporation |
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329 / 393 page  329 8018N–AVR–08/09 ATmega169P 28.3 Speed Grades Maximum frequency is depending on V CC. As shown in Figure 28-1 and Figure 28-2, the Maxi- mum Frequency vs. V CC curve is linear between 1.8V < VCC < 4.5V. To calculate the maximum frequency at a given voltage in this interval, use this equation: To calculate required voltage for a given frequency, use this equation:: At 3 Volt, this gives: Thus, when V CC = 3V, maximum frequency will be 9.33 MHz. At 6 MHz this gives: Thus, a maximum frequency of 6 MHz requires V CC = 2.25V. Figure 28-1. Maximum Frequency vs. V CC, ATmega169PV Table 28-1. Constants used to calculate maximum speed vs. V CC Voltage and Frequency range a b Vx Fy 2.7 < VCC < 4.5 or 8 < Frq < 16 8/1.8 1.8/8 2.7 8 1.8 < V CC < 2.7 or 4 < Frq < 8 1.8 4 Frequency a V Vx – () • Fy + = Voltage b F Fy – () • Vx + = Frequency 8 1.8 -------- 32.7 – () • 8 + 9.33 == Voltage 1.8 8 -------- 64 – () • 1.8 + 2.25 == 8 MHz 4 MHz 1.8V 2.7V 5.5V Safe Operating Area |
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