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전자부품 데이터시트 검색엔진 |
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전자부품 데이터시트 검색엔진 |
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VNF1048F 데이터시트(PDF) 38 Page - STMicroelectronics |
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VNF1048F 데이터시트(HTML) 38 Page - STMicroelectronics |
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38 / 49 page  7.3 Standby mode In standby mode, the device is in quiescent power consumption and operates under the following conditions: • High current path through external FETs is off • Protections for the external FETs are disabled • All diagnostics are disabled, but BYPASS switch saturation is monitored, if BYPASS switch is in ON state during standby mode, in order to detect potential desaturation • Low-current bypass can be ON or OFF according to the ‘BYPASSCTL’ bit • The device is self-protected • Charge pump is OFF The standby mode characteristics are: • VSPI and VS low consumption • SPI inactive • Registers are frozen (powered but with the clock stopped) allowing to keep either previous configuration, in case of transition from unlocked state, or default reset configuration, in case of transition from power-on state The standby mode is reached in case of power-on state transition from unlocked mode through the following SPI frame sequence: 1. Frame #1 to set UNLOCK bit in CR#3 2. Frame #2 to reset EN and set GOSTBY in CR#1 Exit from standby mode occurs in any of the following cases: • CSN Low for a time t > tSTBY_OUT Or • BYPASS switch in ON state and desaturation event occurrence 7.4 Wake-up mode The device enters in wake-up mode from standby when the VS - VOUT > VDS_BYPASS_SAT. In wake-up mode, the device fuse functionality is armed and the device operates under the following conditions: • High current path through external FETs is ON • Protections for the external FETs are enabled • Low-current bypass is OFF • All diagnostics are enabled • Control registers are locked to write operations • The device is self-protected • SPI is active • Charge pump is ON 7.5 Unlocked mode In unlocked mode, the device fuse functionality is armed and SPI communication is allowed. The device operates under the following conditions: • High current path through external FETs can be ON or OFF, depending on the SPI setting • Protections for the external FETs are enabled • All diagnostics are enabled • Low-current bypass can be ON or OFF, depending on the SPI setting • The device is self-protected • SPI is active • Charge pump is ON VNF1048F Operating modes DS13084 - Rev 8 page 38/49 |
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