PSD853F5VA-15UI データシートの表示（PDF） - STMicroelectronics

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PSD853F5VA-15UI

Flash in-system programmable (ISP) peripherals for 8-bit MCUs, 5 V

STMicroelectronics 

AC/DC parameters

PSD8XXFX

Table 38. Example of PSD typical power calculation at VCC=5.0 V (Turbo mode on) (1)

Conditions

Number of product terms used

(from fitter report)

% of total product terms

Turbo mode

= 45 PT

= 45/182 = 24.7%

= ON

Calculation (using typical values)

ICC total

= Ipwrdown x %pwrdown + %normal x (ICC (ac) + ICC (dc))

= Ipwrdown x %pwrdown + % normal x (%flash x 2.5 mA/MHz x Freq ALE

+ %SRAM x 1.5 mA/MHz x Freq ALE

+ % PLD x 2 mA/MHz x Freq PLD

+ #PT x 400 µA/PT)

= 50 µA x 0.90 + 0.1 x (0.8 x 2.5 mA/MHz x 4 MHz

+ 0.15 x 1.5 mA/MHz x 4 MHz

+ 2 mA/MHz x 8 MHz

+ 45 x 0.4 mA/PT)

= 45 µA + 0.1 x (8 + 0.9 + 16 + 18 mA)

= 45 µA + 0.1 x 42.9

= 45 µA + 4.29 mA

= 4.34 mA

1. This is the operating power with no EEPROM WRITE or Flash memory Erase cycles in progress. Calculation is based on

IOUT = 0 mA.

Table 39. Example of PSD typical power calculation at VCC = 5.0 V (Turbo mode off) (1)

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

94/128

Doc ID 7833 Rev 7

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