PSD814G3V-C-90M 데이터 시트보기 (PDF) - STMicroelectronics

부품명

상세내역

제조사

PSD814G3V-C-90M

Configurable Memory System on a Chip for 8-Bit Microcontrollers

STMicroelectronics 

PSD8XX Family

AC/DC

Parameters

(cont.)

PSD835G2

Example of Typical Power Calculation at VCC = 5.0 V in Turbo Off Mode

Conditions

Highest Composite PLD input frequency

(Freq PLD)

= 8 MHz

MCU ALE frequency (Freq ALE)

= 4 MHz

% Flash Access

% SRAM access

% I/O access

= 80%

= 15%

= 5% (no additional power above base)

Operational Modes

% Normal

% Power Down Mode

= 10%

= 90%

Number of product terms used

(from fitter report)

% of total product terms

= 45 PT

= 45/193 = 23.3%

Turbo Mode

= Off

Calculation (typical numbers used)

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 writes or erases. Calculation is based

on IOUT = 0 mA.

76

Share Link: