PSD4231G3V-15UIT View Datasheet(PDF) - STMicroelectronics

Part Name

Description

Manufacturer

PSD4231G3V-15UIT

Flash In-System Programmable (ISP) Peripherals For 16-bit MCUs (5V Supply)

STMicroelectronics 

PSD4235G2

Table 54. Example of PSD Typical Power Calculation at VCC = 5.0 V (with 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 = 45/193 = 23.3%

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 2.5 mA/MHz x Freq ALE

+ %SRAM x 1.5 mA/MHz x Freq ALE

+ % PLD x (from graph using Freq PLD))

= 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

+ 24 mA)

= 45 µA + 0.1 x (8 + 0.9 + 24)

= 45 µA + 0.1 x 32.9

= 45 µA + 3.29 mA

= 3.34 mA

This is the operating power with no Flash memory Program or Erase cycles in progress. Calculation is based on IOUT

= 0 mA.

67/89

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