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MAX16067 Datasheet(PDF) 43 Page - Maxim Integrated Products |
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MAX16067 Datasheet(HTML) 43 Page - Maxim Integrated Products |
43 / 47 page ![]() ______________________________________________________________________________________ 43 6-Channel, Flash-Configurable System Manager with Nonvolatile Fault Registers so that all faults propagate between devices. If a critical fault occurs on one device, EXTFAULT asserts, triggering the nonvolatile fault logger in all cascaded devices and recording a snapshot of all system voltages. U Connect open-drain RESET outputs together to obtain a master system reset signal. U Connect all EN inputs together for a master enable sig- nal. Since the internal timings of each cascaded device are not synchronized, EN_OUT_s placed in the same slot on different devices do not come up in the desired order even if the sequence delays are identical. U Consider using an external FP to control the EN inputs or the software enable bits of cascaded devices, mon- itoring the RESET outputs as a power-good signal. U For a large number of voltage rails, the MAX16067 can be cascaded hierarchically by using one master device’s EN_OUT_s to control the EN inputs of several slave devices. Controlling Power Supplies Without Using the Sequencer A FP can control power supplies manually without involv- ing the sequencing slot system by controlling EN_OUT_s configured as GPIO. The output of a power supply con- trolled this way can be monitored using a MON_ input configured as “monitoring only” (see the Monitoring Inputs While Sequencing section). To monitor the sup- ply for critical faults, the FP will need to manually set the critical fault enable bit in r6Eh–r72h after turning on the EN_OUT_, and manually clearing the critical fault enable bit before turning off the EN_OUT_. Layout and Bypassing Bypass DBP and ABP each with a 1FF ceramic capacitor to GND. Bypass VCC with a 10FF capacitor to ground. Avoid routing digital return currents through a sensitive analog area, such as an analog supply input return path or ABP’s bypass capacitor ground connection. Use dedicated analog and digital ground planes. Connect the capacitors as close as possible to the device. Figure 17. Graphical User Interface Screenshot |
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