L9374LF datasheet(70/80 Pages) STMICROELECTRONICS

70 / 80 page

Programmers guide

L9374LF

70/80

DocID025414 Rev 1

Output duty:

This value shows the duty cycle commanded by the current controller (9 bit control variable)

just prior to the time of the SPI transfer. The resolution of LSB is that f the PWM command

Timing example:



Time base: 5 ms between SPI transfers



Output-frequency: 4 kHz

 250 μs

The Out_Duty_Qx value shows the duty cycle at 4,75 ms.

The maximum value read is 1FF(H). This occurs when the output current cannot reach the

commanded value (refer to section 3.3.6: Q3 / Q4 (current controller) for more information).

Current Not Reachable (CNRx):

This bit is set if the control variable of the current at output Qx shows the maximum value

(1FF(H)) for more than 8 ms (typ.). This bit can be cleared by accessing this address, when

the failure does not exist anymore (refer to section 3.3.6: Q3 / Q4 (current controller) for

more information).

5.2.5

ISAT-Qx (address 8 + 9)

ISAT_Qx:

ISAT_Qx is an internal value of the current controller. This is used by the current controller

to provide accurate current regulation (refer to section 3.3.6: Q3 / Q4 (current controller) for

more details).

MSB

LSB

10000

ISAT_Q3

Parit

10001

ISAT_Q4

Parit

free

Table 67. ISAT_Qx

Channel status

Number of bits

Name

ISAT_Qx

10 Bit

ISAT_Qx

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