PSD934210MT View Datasheet(PDF) - STMicroelectronics

Part Name

Description

Manufacturer

PSD934210MT

Flash PSD, 3.3V Supply, for 8-bit MCUs 2 Mbit + 256 Kbit Dual Flash Memories and 64 Kbit SRAM

STMicroelectronics 

PSD834F2V

Table 36. Example of PSD Typical Power Calculation at VCC = 3.3 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 = 45/182 = 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 1.5 mA/MHz x Freq ALE

+ %SRAM x 0.8 mA/MHz x Freq ALE

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

= 25 µA x 0.90 + 0.1 x (0.8 x 1.5 mA/MHz x 4 MHz

+ 0.15 x 0.8 mA/MHz x 4 MHz

+ 14 mA)

= 22.5 µA + 0.1 x (4.8 + 0.48 + 14) mA

= 22.5 µA + 0.1 x 19.28 mA

= 22.5 µA + 1.928 mA

= 1.95 mA

This is the operating power with no Write or Flash memory Erase cycles in progress.

Calculation is based on IOUT = 0 mA.

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