AN3213 datasheet(56/64 Pages) STMICROELECTRONICS

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FAQs and troubleshooting

AN3213

56/64

Doc ID 17429 Rev 1

9.2

Troubleshooting

Problem: the ST7570 demonstration board doesn't work at all.

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What to check:

Check that the AC mains supply cable is well connected

Check if the DL1 (VCC) and DL2 (VDDIO) are on

Check the voltage on VCC, VDDIO, VCCA, VDD, and VDD_PLL lines. All these

voltages must be present in order to turn on the ST7570.

Problem: the ST7570 demonstration board is not responding.

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What to check:

Check if some activity on DL3 and DL4 is present when trying to communicate via

USB with the board

Try disconnecting and reconnecting the USB cable; sometimes the USB driver

fails during COM port opening

Verify if an 8 MHz clock is present on the XOUT pin (13) of the ST7570 device.

Problem: the ST7570 demonstration board does not transmit.

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What to check:

Check the bias voltage on the PA_OUT test point (TP1) with the oscilloscope

probe referred to VSS power ground. A DC voltage of VCC/2 must be measured

during RX state

Set the ST7570 in continuous transmission by setting TEST0 (higher frequency

tone), TEST1 (lower frequency tone) or TEST2 (alternating tones) modes via the

ST7570 GUI. A sinusoidal carrier should be detected by the oscilloscope probe,

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