AN2476 datasheet(33/49 Pages) STMICROELECTRONICS

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AN2476

Operating measurements

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Operating measurements

3.1

Setup board

The STR750 evaluation board (order code STR750-EVAL) and Uniboard (order code UB-

QFP100-1414O/ ) are available for evaluation and testing purposes. Contact your local ST

sales office for further details.

3.1.1

Measurement with STR750_EVAL Board

Before starting the measurements, the potentiometer RV2 should be removed from the

boards MB469 and MB469 rev. B.

For correct usage instructions, refer to the User Manual STR750_EVAL Board, UM0268.

With this board measurements can only be made at 3.3V (Single supply) or 3.3V and 1.8V

(Dual supply).

Consumption measurements

●

In Single Supply: measurements can be made by replacing JP3 by an ampermeter.

JP4, JP5, JP6 and JP13 must not be fitted.

●

In Dual Supply: measurements can be made by replacing JP3 by an ampermeter,

setting jumper JP4, and replacing JP5 and JP6 by an ampermeter to measure the

consumption on V18BKP and V18 respectively. JP13 must not be fitted.

●

Caution: the standby mode is not available in dual supply.

Wake-up time measurements

●

Definition:

Two wake-up time measurements can be made. The STR75x can be restarted either

from the low-power mode on the internal free oscillator (FREEOSC ) or on the main

oscillator, restarting it if necessary (OSC4M PLL).

–

FREEOSC: Time between wake-up trigger event and the first fetched instruction

by the core.

–

OSC4M PLL: Time between the wake-up trigger event and the execution of the

instruction once the clock has been started by either the library function or in the

interrupt handler routine.

●

Measurement: Place the oscilloscope on:

–

Pins P1.15 (WKP_STDBY pin) and P0.16 to measure the wake-up-time in a

FREEOSC configuration. This time is measured between the rising edge on P1.15

and a falling edge on P0.16.

–

Pins P1.15 (WKP_STDBY pin) and P2.18 to measure the wake-up-time in a

OSC4M PLL configuration. This time is measured between the rising edge on

P1.15 and a falling edge on P2.18.

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