ST52T400 datasheet(75/94 Pages) STMICROELECTRONICS

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ST52T400/T440/E440/T441

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11.4 Supply Current Characteristics

Supply current is mainly a function of the operating

voltage and frequency. Other factors such as I/O

pin loading and switching rate, oscillator type,

internal code execution pattern and temperature,

also have an impact on the current consumption.

The test condition in RUN mode for all the IDD

measurements are:

OSCin = external square wave, from rail to rail;

OSCout = floating;

All I/O pins tristated pulled to VDD

TA=25

°C

Figure 11.4 Typical IDD in RUN vs fosc

Figure 11.5 Typical IDD in WAIT vs fosc

Table 11.5 Supply Current in RUN and WAIT Mode

Symbol

Parameter

Conditions

Typ

Max3)

Unit

IDD

Supply current in RUN mode 1)

VDD=5V±5%

TA=25

°C

fosc=2 Mhz

6.48

fosc=4 Mhz

7.95

8.16

fosc=5 Mhz,

9.08

9.27

fosc=10

15.5

15.6

fosc=20

28.3

28.92

Supply current in WAIT mode2)

fosc=2 MHz

4.4

4.41

fosc=4 MHz

6.0

6.09

fosc=5 MHz

6.6

6.89

fosc=10

12.2

12.31

fosc=20

23.0

23.07

2.0

3.0

4.0

5.0

6.0

VDD[V]

2MHz

4MHz

5MHz

10MHz

20MHz

2.0

2.5

3.0

3.5

4.0

4.5

5.0

5.5

6.0

VDD[V]

2MHz

4MHz

5MHz

10MHz

20MHz

Notes:

1. CPU running with memory access, all I/O pins in input mode with a static value at VDD (no load), all

peripherals switched off; clock input (OSCin driven by external square wave).

2. CPU in WAIT mode with all I/O pins in input mode with a static value at VDD (no load), all peripherals

switched off; clock input (OSCin driven by external square wave).

3. Data based on characterization results, tested in production at VDDmax and foscmax.

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