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データシートサーチシステム |
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データシートサーチシステム |
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STPM098C データシート(PDF) 11 Page - STMicroelectronics |
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STPM098C データシート(HTML) 11 Page - STMicroelectronics |
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11 / 110 page  3 Functional description 3.1 Internal supply 3.1.1 VCC power supply The VCC power supply is the main power input of STPM098C. The VCC rail starts the power-up and the power- down sequences by feeding the subsequent internal purpose circuitries (that is, bandgaps, monitoring units and internal regulators control loops). Starting form VCC pin the reference structures are replicated into two independent instances to avoid common- cause failures (a main one and an auxiliary one). Figure 5. Internal power supply simplified block diagram Main Bandgap Reference Auxiliary Bandgap Reference VCC Monitor VBG AUXILIARY VBG MAIN BG AUX OK VCC_OV Auxiliary Current Reference Main Current Reference BG MAIN OK + - GND CFILT/VREF1 CFILT/VREF2 + - GND VCC 5V Analog Circuitry GND VREF1 Monitor POR_DIG CFILT/VREF1 VREF2 Monitor VREF2 UV VREF2 OV CFILT/VREF2 VCC_UV POR_ANA 3.1.1.1 VCC monitor VCC voltage level is monitored by means of dedicated UV and an OV diagnosis. Abnormal behavior on the internal supply level causes the generation of a POR_ANA (analog power-on reset) event that consequently sends STPM098C into SAFE_HIZ state. Hysteresis on thresholds and filtering time are implemented. If VCC ≤ VCC_uv_th occurs for an interval longer than T_vcc_uv_flt, VCC_UV flag is set, POR_ANA is asserted low and SAFE_HIZ is established. The error flag remains set until the failure condition is removed and a rising edge on VR1_EN or VR2_EN is detected. The failure condition can be removed also by PMBUS command CLEAR_FAULTS or by dedicated commands (depending on PMBUS configurations). If VCC ≥ VCC_ov_th occurs for an interval longer than T_vcc_ov_flt, VCC_OV flag is set, POR_ANA is asserted low and SAFE_HIZ is established. The error flag remains set until the failure condition is removed and a rising edge on VR1_EN or VR2_EN is detected. The failure condition can be removed also by PMBUS command CLEAR_FAULTS or by dedicated commands (depending on PMBUS configurations). VCC monitor is safety relevant and then a self-check procedure is implemented. STPM098C Functional description DS14440 - Rev 1 page 11/110 |
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