AN4218 Datasheet, PDF (13/26 Pages) STMicroelectronics – Hardware design guideline

AN4218
Good practices of system power supply
Figure 11. Measurement over the entire pulse
1. Line 1 (RST): NRESET output
Line 2 (V1): microcontroller power supply V_DD
Line 3 (VBAT): system power supply (V_BAT)
Line 4 (OUT_HS): high-side driver output
Line D4 (CSN): SPI-logic signal chip-select-not
Line D5 (OUT_LS): low-side driver output
Line D7 (FSO): fail-safe state (internal signal)
Figure 12. Zoom into the low voltage drop region
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1. Line 1 (RST): NRESET output
Line 2 (V1): microcontroller power supply V_DD
Line 3 (VBAT): system power supply (V_BAT)
Line 4 (OUT_HS): high-side driver output
Line D4 (CSN): SPI-logic signal chip-select-not
Line D5 (OUT_LS): low-side driver output
Line D7 (FSO): fail-safe state (internal signal)
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