PSD913212JIT ST Microelectronics, PSD913212JIT Datasheet - Page 69

• Manufacturer Part Number: PSD913212JIT
• Description: Flash In-System Programmable ISP Peripherals For 8-bit MCUs
• Manufacturer: ST Microelectronics

Preliminary Information
AC/DC
Parameters
(cont.)
Example of Typical Power Calculation at V
Conditions
Highest Composite PLD input frequency
MCU ALE frequency (Freq ALE)
Operational Modes
Number of product terms used
Turbo Mode
Calculation (typical numbers used)
I
This is the operating power with no Flash writes or erases. Calculation is based
on I
CC
total = Ipwrdown x %pwrdown + %normal x
OUT
(Freq PLD)
% Flash Access
% SRAM access
% I/O access
% Normal
% Power Down Mode
(from fitter report)
% of total product terms
= 0 mA.
= Ipwrdown x %pwrdown + % normal x
= 50 µA x 0.90 + 0.1 x (0.8 x 2.5 mA/MHz x 4 MHz
= 45 µA + 0.1 x (8 + 0.9 + 24)
= 45 µA + 0.1 x 32.9
= 45 µA + 3.29 mA
= 3.34 mA
+ %SRAM x 1.5 mA/MHz x Freq ALE
+ % PLD x (from graph using Freq PLD)
+ 0.15 x 1.5 mA/MHz x 4 MHz
+ 24 mA)
= 8 MHz
= 4 MHz
= 80%
= 15%
= 5% (no additional power above base)
= 10%
= 90%
= 45 PT
= 45/153 = 29.4%
= Off
CC
= 5.0 V in Turbo Off Mode
(
(
I
%flash x 2.5 mA/MHz x Freq ALE
CC
(ac) + I
CC
)
(dc)
)
PSD9XX Family
65