PSD854F515UI View Datasheet(PDF) - STMicroelectronics

Part Name

Description

Manufacturer

PSD854F515UI

Flash In-System Programmable (ISP) Peripherals for 8-bit MCUs, 5V

STMicroelectronics 

PSD813F2, PSD833F2, PSD834F2, PSD853F2, PSD854F2

Table 36. Example of PSD Typical Power Calculation at VCC = 5.0V (Turbo Mode On)

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

= ON

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 2mA/MHz x Freq PLD

+ #PT x 400µA/PT)

= 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

+ 2mA/MHz x 8 MHz

+ 45 x 0.4mA/PT)

= 45µA + 0.1 x (8 + 0.9 + 16 + 18mA)

= 45µA + 0.1 x 42.9

= 45µA + 4.29mA

= 4.34mA

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

on IOUT = 0mA.

73/110

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