AN1014 datasheet(17/25 Pages) STMICROELECTRONICS

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HOW TO MINIMIZE THE ST7 POWER CONSUMPTION

7.1.2.1 Run Mode

Methodology: An external CLK source, up to 16MHz is used on pin CLKIN. PLL is disabled

and internal RC Oscillator is OFF. So, fOSC is CLKIN / 2. All peripherals are in reset configura-

tion except the I/O Ports. At reset the SMS bit in the MCCSR is 0, hence fCPU is fOSC. All Ports

are in Push-Pull Outputs with low level.

Measurements:

Table 12. Consumption IDD (RUN Mode) at TA = + 25 °C

7.1.2.2 Slow Mode

Methodology: An external CLK source, up to 16MHz is used on pin CLKIN. PLL is disabled

and internal RC Oscillator is OFF. So, fOSC is CLKIN / 2. All peripherals are in reset configura-

tion except the I/O Ports and the SMS bit in the MCCSR is set to 1, hence fCPU is fOSC/32. All

Ports are in Push-Pull Outputs with low level.

Measurements:

Table 13. Consumption IDD (SLOW Mode) at TA = + 25 °C

External CLK

on CLKIN Pin

(MHz)

fCPU(MHz)

IDD at VDD = 4.5 V

IDD at VDD = 5 V

IDD at VDD = 5.5 V

4.5 mA

5.17 mA

5.86 mA

2.32 mA

2.68 mA

3.07 mA

External CLK

on CLKIN Pin

(MHz)

fCPU(MHz)

IDD at VDD = 4.5 V

IDD at VDD = 5 V

IDD at VDD = 5.5 V

0.25

417

µA490 µA

571

µA

80.125

274

µA320 µA

372

µA

0.03125

142

µA161 µA

192

µA

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