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STPM098C データシート(PDF) 14 Page - STMicroelectronics |
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STPM098C データシート(HTML) 14 Page - STMicroelectronics |
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14 / 110 page  3.1.2.1 VREF1 voltage monitor VREF1 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_DIG (digital power-on reset) event that consequently sends STPM098C into RESET state. Hysteresis on thresholds and filtering time are implemented. If VREF1 ≤ VREF1_uv_th occurs for an interval longer than T_por_htol_flt, POR_DIG is asserted low and internal reset is triggered. After POR_DIG is deasserted, the INT_RST flag is by default set to 1 and then flag can be cleared by VR1_EN or VR2_EN rising edge detection. The failure condition can be removed also by PMBus™ command CLEAR_FAULTS or by dedicated commands. If VREF1 ≥ VREF1_ov_th occurs for an interval longer than T_por_htol_flt, POR_DIG is asserted low and internal reset is triggered. After POR_DIG is deasserted, the INT_RST flag is by default set to 1 and then flag can be cleared by VR1_EN or VR2_EN rising edge detection. The failure condition can be removed by also PMBus™ command CLEAR_FAULTS or by dedicated commands. VREF1 monitor is safety relevant and then a self-check procedure is implemented. Table 9. VREF1 monitor electrical characteristics Symbol Parameter Test condition Min Typ Max Unit Notes VREF1_uv_th VREF1 undervoltage threshold 1.4 1.5 1.6 V Comparator output low to high VREF1_uv_hys VREF1 undervoltage hysteresis 50 105 150 mV - VREF1_ov_th VREF1 overvoltage threshold 1.9 2 2.1 V Comparator output low to high VREF1_ov_hys VREF1 overvoltage hysteresis 20 55 100 mV - T_dpor_ltoh_flt POR DIG Low to high state filter time 3.5 5.5 7.5 μs Analog filter T_dpor_htol_flt POR DIG high to Low state filter time 7 11 15 μs Analog filter Figure 8. VREF1 power supply operative range t VREF1 OV VREF1_TH_OV VREF1_OV_HYST VREF1 _OV (Internal signal) OPERATIVE POR_DIG OPERATIVE OV 0V UV VREF1_UV (Internal signal) T_dpor_ltoh_flt INT_RST (PMBus Flag) VRn_EN Toggling T_dpor_htol_flt VREF1_UV_HYST VREF1_UV_TH 1 2 3 VRn_EN Toggling T_dpor_ltoh_flt T_dpor_htol_flt T_dpor_htol_flt T_dpor_ltoh_flt T_dpor_ltoh_flt T_dpor_htol_flt STPM098C Functional description DS14440 - Rev 1 page 14/110 |
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