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PSD833F2 датащи(PDF) 74 Page - STMicroelectronics

номер детали PSD833F2
подробное описание детали  Flash In-System Programmable (ISP) Peripherals for 8-bit MCUs, 5V
PDF  110 Pages
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производитель  STMICROELECTRONICS [STMicroelectronics]
домашняя страница  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

PSD833F2 датащи(HTML) 74 Page - STMicroelectronics

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Table 37. Example of PSD Typical Power Calculation at VCC = 5.0V (Turbo Mode Off)
Conditions
Highest Composite PLD input frequency
(Freq PLD)
= 8 MHz
MCU ALE frequency (Freq ALE)
= 4 MHz
% Flash memory Access
= 80%
% SRAM access
= 15%
% I/O access
= 5% (no additional power above base)
Operational Modes
% Normal
= 10%
% Power-down Mode
= 90%
Number of product terms used
(from fitter report)
= 45 PT
% of total product terms
= 45/182 = 24.7%
Turbo Mode
= Off
Calculation (using typical values)
ICC total
= Ipwrdown x %pwrdown + %normal x (ICC (ac) + ICC (dc))
= Ipwrdown x %pwrdown + % normal x (%flash x 2.5mA/MHz x Freq ALE
+ %SRAM x 1.5mA/MHz x Freq ALE
+ % PLD x (from graph using Freq PLD))
= 50µA x 0.90 + 0.1 x (0.8 x 2.5mA/MHz x 4 MHz
+ 0.15 x 1.5mA/MHz x 4 MHz
+ 24mA)
= 45µA + 0.1 x (8 + 0.9 + 24)
= 45µA + 0.1 x 32.9
= 45µA + 3.29mA
= 3.34mA
This is the operating power with no EEPROM WRITE or Flash memory Erase cycles in progress. Calculation is based
on IOUT = 0mA.



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