Circuit-test DCL-420 Informations techniques télécharger pdf (Page 19)

Easy Automotive Modules

Evaluation Kit EASYKIT AUX DRIVES (FS50R07W1E3_B11A)

Operating Modes and LED status

Application Note 19 AN2012-10

Evaluation Kit EASYKIT AUX DRIVES (FS50R07W1E3_B11A)

Figure 11 Overview of self test sequence with the four major test procedures.

The first part of the passive procedure checks the supply voltage of the uC and ADC. The ADC_1V95 signal

is connected to the uC supply status led, which has a quite stable voltage drop of 1.95V over wide supply

voltages. In case of drifts of the uC supply voltage, the ADC scaling of all sensors would not be correct. But

such a drift will be detected because in such cases the ADC_1V95 signal is also distorted and out of range.

After this test the test procedure waits for a DCL voltage higher than 20V. This is required because the later

switching tests makes no sense if the switch and phase voltages has always 0V Vce.

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Circuit-test DCL-420 Informations techniques Page 19