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STA381BWS Datasheet(PDF) 89 Page - STMicroelectronics |
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STA381BWS Datasheet(HTML) 89 Page - STMicroelectronics |
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89 / 171 page  STA381BWS Register description: New Map Doc ID 018937 Rev 6 89/171 6.28 Short-circuit protection mode registers SHOK (address 0x58) The following power bridge pins short-circuit protections are implemented in the STA381BWS: ● OUTxx vs. GNDx ● OUTxx vs. VCCx ● OUT1B vs. OUT2A The protection is enabled when reg. 0x50 bit 0 (SHEN) is set to ‘1’. The protection will check the short-circuit when the EAPD bit is toggled from ‘0’ to ‘1’ (i.e. the power bridge is switched on), and only if the test passes (no short), does the power bridge leave the tristate condition. Register 0x58 (read-only registers) will give more information about the detected short type. GNDSH equal to ‘0’ means that OUTxx is shorted to ground, while the same value on VCCSH means that OUTxx is shorted to Vcc, finally OUTSH=’0’ means that OUT1B is shorted to OUT2A. To be noted that once the check is performed, and the tristate released, the short protection is not active anymore until the next EAPD 0->1 toggling which means that shorts that happened during normal operation cannot be detected. To be noted that register SHOK is meaningful only after the EAPD bit is set to ‘1’ at least once. The short-circuit protections implemented are effective only in BTL configuration, and they must not be activated if a single-ended application scheme is needed. Table 84. PLL register 0x57 bits Bit R/W RST Name Description 3 R/W BYPSTATE PLL bypass state 2 R/W PDSTATE PLL PD state 1 R/W OSCOK OSCI locked 0 R/W LOWCK Clock input low-frequency check D7 D6 D5 D4 D3 D2 D1 D0 reserved reserved reserved reserved reserved GNDSH VCCSH OUTSH NA NA NA NA NA NA NA NA |
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