ST72321 datasheet(141/185 Pages) STMICROELECTRONICS

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ST72321

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12.4 SUPPLY CURRENT CHARACTERISTICS

The following current consumption specified for the ST7 functional operating modes over temperature

range does not take into account the clock source current consumption. To get the total device consump-

tion, the two current values must be added (except for HALT mode for which the clock is stopped).

12.4.1 RUN and SLOW Modes (Flash devices)

Figure 71. Typical IDD in RUN vs. fCPU

Figure 72. Typical IDD in SLOW vs. fCPU

Notes:

1. Data based on characterization results, tested in production at VDD max. and fCPU max.

2. Measurements are done in the following conditions:

- Progam executed from RAM, CPU running with RAM access. The increase in consumption when executing from Flash

is 50%.

- All I/O pins in input mode with a static value at VDD or VSS (no load)

- All peripherals in reset state.

- CSS and LVD disabled.

- Clock input (OSC1) driven by external square wave.

- In SLOW and SLOW WAIT mode, fCPU is based on fOSC divided by 32.

To obtain the total current consumption of the device, add the clock source (Section 12.5.3 and Section 12.5.4) and the

peripheral power consumption (Section 12.4.7).

Symbol

Parameter

Conditions

Typ

Max 1)

Unit

IDD

Supply current in RUN mode 2)

(see Figure 71)

fOSC=2MHz, fCPU=1MHz

fOSC=4MHz, fCPU=2MHz

fOSC=8MHz, fCPU=4MHz

fOSC=16MHz, fCPU=8MHz

1.3

2.0

3.6

7.1

3.0

5.0

8.0

15.0

Supply current in SLOW mode 2)

(see Figure 72)

fOSC=2MHz, fCPU=62.5kHz

fOSC=4MHz, fCPU=125kHz

fOSC=8MHz, fCPU=250kHz

fOSC=16MHz, fCPU=500kHz

0.6

0.7

0.8

1.1

2.7

3.0

3.6

4.0

3.2

3.6

4.4

4.8

5.2

5.5

Vdd (V)

8MHz

4MHz

2MHz

1MHz

0.00

0.20

0.40

0.60

0.80

1.00

1.20

3.2

3.6

4.4

4.8

5.2

5.5

Vdd (V)

500kHz

250kHz

125kHz

62.5kHz

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