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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voltage thresholds) using serial interface. The feedback reference voltage is selected by 
writing the SelFBRef[1:0] bits in the Aux1SwCfg or Aux2SwCfg registers.

The switching regulators have four possible PWM duty cycles that can be changed using 
SPI according to 

.

         

As seen before L6460 contains 2 regulation loops for switching regulators that are used 
when bridge 3 is used as a regulator. These loops are assembled using internal 
comparators and filters similar to that used in main switching regulator.

When bridge 3 is not used for this purpose or when only one regulation loop is needed, the 
control loop is available on a GPIO output thus enabling the customer to assembly a basic 
buck switching regulator using an external Power FET. The comparators used in the above 
mentioned regulation loops are general purpose low voltage (3.3 V) comparators; when the 
relative regulation loop is not used they can be accessed as shown in the 

00

10%

 

01

13%

Default state for AUX1

10

24%

Default state for AUX2

11

61%

 

GPIOz 

GPIOx 

GPIOx 

DECODE 

LOGIC 

GPIOy 

GPIOy 

DECODE 

LOGIC 

GPIOz Logic 

Driver 

- 

+ 

V

3v3

 

GPIOz 

DECODE 

LOGIC 

GPIOz Value From SPI

 

GP

IO

x

M

o

d

e 

GPIOzMod

e 

GPIOyMode