AN2633 datasheet(29/48 Pages) STMICROELECTRONICS

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AN2633

Operating measurements

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Operating measurements

3.1

Board set-up

The STR910 evaluation board (order code STR910-EVAL) and Uniboard (order code

UNIBOARD TQFP 128 14×14) are available for evaluation and testing purposes. Contact

your local ST sales office for further details.

3.1.1

Performing measurements with the STR910-EVAL board

For operating instructions, refer to the STR910_EVAL Board User Manual. With this board,

measurements can be made at VDDQ, VDD, AVDD and VBATT.

Consumption measurements

●

Current consumption in VDD can be made by replacing JP4 by an amperemeter.

●

Current consumption in VDDQ can be made by replacing JP2 by an amperemeter.

●

Current consumption in VBATT can be made by replacing JP15 by an amperemeter (to

measure battery current consumption).

●

Current consumption in AVDD can be made by replacing JP3 by an amperemeter (to

measure ADC current consumption).

To reduce power consumption, connect a pull-up resistor to USBDP pin and a pull-down

resistor to TAMPER_IN pin.

Wake-up time measurements

Definition:

Three wake-up times are defined:

●

Wake-up time from Sleep mode with a crystal connected to X1_CPU and X2_CPU,

●

Wake-up time from Sleep mode with an oscillator connected to X1_CPU,

●

Wake-up time from Idle mode.

●

These wake-up times measure the time between the wake-up trigger event and the first

fetched instruction by the core.

3.1.2

Performing measurements with the Uniboard TQFP128

Environment

The software toolsets used for the connection are: IAR or Signum. It is not possible to

connect with RVDK.

Note:

All pins on port 0 - 9 are 5 V tolerant.

There are no internal or programmable pull-up resistors on I/O ports 0 to 9. By default they

are in high-impedance input mode.

These external components are needed to update Uniboard TQFP128:

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