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STA369BWS bảng dữ liệu(PDF) 73 Page - STMicroelectronics |
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STA369BWS bảng dữ liệu(HTML) 73 Page - STMicroelectronics |
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73 / 89 page  STA369BWS Register description Doc ID 16861 Rev 4 73/89 6.17 Short-circuit protection mode registers SHOK (addr 0x46) The following power-bridge pins short-circuit protection are implemented in STA369BWS: OUTxx vs GNDx OUTxx vs VCCx The protection is enabled when register MISC2 (address 0x4C) bit SHEN is set to 1. The protection checks the short circuit when EAPD bit is toggled from 0 to 1 (that is, the power bridge is switched on), and only if it passes the test (no short) will the power bridge leave the 3-state condition. Register 0x46 (read-only register) gives more information about the detected short type. GNDxx equal to 0 means that OUTxx is shorted to ground, while the same value on VCCxx means that OUTxx is shorted to VCC. To be noted that once the check is performed, and the tristate released, the short-circuit protection is not active again until the next EAPD 0 -> 1 toggling. It means that shorts happening during normal operation are not detected. The content of register 0x46 is meaningful only after EAPD bit is set to 1 at least once. The short-circuit protection implemented is effective only in BTL configuration, and it must not be activated (that is, SHEN must be 0) in single-ended applications. Table 85. Bits VRESEN and VRESTG description VRESEN VRESTG Mode 0 0 Extra volume resolution disabled 0 1 Extra volume resolution disabled 1 0 Fine volume tuning enabled and applied immediately 11 Fine volume tuning enabled and applied when master or channel volume is updated D7 D6 D5 D4 D3 D2 D1 D0 GND1A GND1B GND2A GND2B VCC1A VCC1B VCC2A VCC2B 11 11 111 1 |
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