PSD511B1 datasheet(114/153 Pages) STMICROELECTRONICS

114 / 153 page

PSD5XX Family

111

Conditions

Composite PLD input frequency (Freq PLD)

= 8 MHz

MCU ALE frequency (Freq ALE)

= 4 MHz

% EPROM Access

= 80%

% SRAM access

= 15%

% I/O access

= 5% (no additional power above base)

Operational Modes

% Normal

= 10%

% Sleep

= 90%

Number of product terms used

(from fitter report)

= 45 PT

% of total product terms

= 29/118 = 24.6%

Turbo = off

CMiser = on

8-bit bus mode

Calculation (typical numbers used)

ICC total = Isleep x %sleep + %normal x (ICC (ac) + ICC (dc))

= Isleep x %sleep + % normal x

(%EPROM x 0.8 mA/MHz x Freq ALE

+ %SRAM x 1.4 mA/MHz x Freq ALE

+ %PLD x (from graph using Freq PLD)

)

= 10 µA x 0.90 + 0.1 x (0.8 x 0.8 mA/MHz x 4 MHz

+ 0.15 x 1.4 mA/MHz x 4 MHz + 0.95 x 23

= 0.9 µA + 0.1 x (2.56 + 0.84 + 21.85)

= 0.9 µA + 0.1 x 25.3

= 0.9 µA + 2.53 mA

= 2.53 mA

Standby current consumption is handled similarly to sleep mode shown above.

Calculation based on IOUT = 0 mA.

13.5 Example of PSD5XX Typical Power Calculation at VCC = 5.0 V

Specifications

(cont.)

010

PT100%

PT25%

COMPOSITE FREQUENCY AT PLD INPUTS (MHz)

TURBO

OFF

TURBO

OFF

Figure 51. ZPLD Typical ICC / Frequency Consumption (ZPSD5XXV Devices) (3 V)

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