PSD813F2 Datasheet

  • PSD813F2

  • FLASH IN-SYSTEM PROGRAMMABLE (ISP) PERIPHERALS FOR 8-BIT MCU...

  • 1180.57KB

  • STMicroelectronics   STMicroelectronics

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PSD835G2
PSD8XX Family
AC/DC
Parameters
(cont.)
Figure 30a. PLD I
CC
/Frequency Consumption
(PSD835G2V Versions, V
CC
= 3 V)
60
V
CC
= 3V
50
I
CC
鈥?(mA)
40
ON (
BO
TUR
100%
)
30
20
10
OF
F
TU
R
ON (2
RBO
TU
BO
5%)
R
TU
0
0
BO
F
OF
PT 100%
PT 25%
5
10
15
20
25
HIGHEST COMPOSITE FREQUENCY AT PLD INPUTS (MHz)
Example of PSD835G2 Typical Power Calculation at V
CC
= 5.0 V
Conditions
Highest Composite PLD input frequency
(Freq PLD)
MCU ALE frequency (Freq ALE)
% Flash Access
% SRAM access
% I/O access
Operational Modes
% Normal
% Power Down Mode
Number of product terms used
(from fitter report)
% of total product terms
Turbo Mode
=
=
=
=
=
=
=
=
=
=
8 MHz
4 MHz
80%
15%
5% (no additional power above base)
10%
90%
45 PT
45/193 = 23.3%
ON
Calculation (typical numbers used)
I
CC
total = Ipwrdown x %pwrdown + %normal x
(
I
CC
(ac) + I
CC
(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 2 mA/MHz x Freq PLD
+ #PT x 400 碌A/PT
= 50 碌A 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
+2 mA/MHz x 8 MHz
+ 45 x 0.4 mA/PT)
= 45 碌A + 0.1 x (8 + 0.9 + 16 + 18 mA)
= 45 碌A + 0.1 x 42.9
= 45 碌A + 4.29 mA
= 4.34 mA
This is the operating power with no Flash writes or erases. Calculation is based
on I
OUT
= 0 mA.
75

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