L6460 View Datasheet(PDF) - STMicroelectronics
Part Name
Description
MFG CO.
'L6460' PDF : 139 Pages View PDF
Power sequencing
9
Power sequencing
L6460
As soon as VSupply and VSupplyInt are above their power on reset level, L6460 will start the
charge pump circuit; once VPump voltage reaches its under voltage rising threshold, L6460
begins a sequence that starts the regulators considered system regulators.
A regulator is considered a System regulator if:
– It has to start in on state without any user action.
– It is included in the power-up sequence.
– Its under-voltage event is considered by L6460 as an error condition to be
signaled through nRESET pin.
Once VSupply and VSupplyInt, VPump and all the system regulators are over their under
voltage rising threshold, L6460 enters in the normal operating state, that will release
nRESET pin and will wait for SPI commands.
L6460 will reduce the noise introduced in the system by switching out of phase all its power
circuits (switching regulators, bridges and charge pump).
The L6460's startup sequence of operation is the following:
– start V3v3 internal linear regulator
– sample startup configuration
– wait enable if slave device
– start charge pump
– start system regulators (see order in Section 8.6)
– if master send enable to slave device
– wait until VGPIO_SPI becomes ok
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Doc ID 17713 Rev 1
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