STMicroelectronics FlexSPIN: SPI configurable stepper and DC multi motor driver evaluation board EVAL6460 EVAL6460 Data Sheet

Doc ID 17713 Rev 1

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Low voltage power switches are analog switches designed to operate from a single +2.4 V 
to +3.6 V V

GPIO_SPI

 supply. They are intended to provide and remove power supply to low 

voltage devices. When switched on, they connect the V

GPIO_SPI

 pin to their output pin 

(GPIO[6] for low voltage power switch 1 or GPIO[7] for low voltage power switch 2) thus 
powering the device connected to it. The turning on and off of each switch can be controlled 
through serial interface.

L6460 provides 2 low voltage power switches, each of them has current limitation to 
minimum 150mA to limit inrush current when charging a capacitive load. When the limit 
current has been reached, for more than a T

filter

 time, then a flag is activated; this flag is 

latched in the central logic and can be cleared by the firmware. Please note that, in case of 
capacitive load, the current limit is reached the first time the low power switch is turned on: 
therefore the user will find a limit flag that must be cleared.

The 2 low voltage power switches can be externally paralleled to obtain a single super low 
voltage power switch. Low voltage pass switches sink current needed for their functionality 
from pin V

GPIO_SPI

, they never inject current on this pin.

 

EnLowVSw[x] 

GPIO[6] (LPS 1) 

or 

GPIO[7] (LPS 2) 

 

Current 

Limit  

Sensor 

Driving 

Circ

u

it

 

V

GPIO_SPI

 

LowVSwIlim[x]  

To SPI

S  

R  

LowVSwIlimLth[x]  

ClrLowVrSwLth  

Reset State 

 

GPIO[6]/GPIO[7]  
Driver