参数资料
型号: L6460TR
厂商: STMICROELECTRONICS
元件分类: 运动控制电子
英文描述: STEPPER MOTOR CONTROLLER, PQFP64
封装: 10 X 10 MM, 1 MM HEIGHT, ROHS COMPLIANT, TQFP-64
文件页数: 79/139页
文件大小: 3837K
代理商: L6460TR
Power sequencing
L6460
44/139
Doc ID 17713 Rev 1
9
Power sequencing
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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