L9374LF datasheet(64/80 Pages) STMICROELECTRONICS

64 / 80 page

Programmers guide

L9374LF

64/80

DocID025414 Rev 1

5.1.9

Configuration register 3 (CCV reset and load resistance values)

(address 15)

Reset current controller values command (Res_CCV):

The Current Controller values are reset and the new RL_SPI is used after the reset time.

During the reset phase the current controller regulation variable ISAT is set to zero and no

current regulation is possible. When changing the RL_SPI it is necessary to reset the

current controller by giving this command

Writing Not Valid bit combinations generates a SPI-data-failure and causes that specific SPI

command word to be ignored and subsequent returning Status Register data to be set to all

‘1’s.

RL_SPI:

RL_SPI is an 8 bit value representing the expected load resistance driven by the current

controller outputs (Q3 and Q4). This value is used for both current controllers. The controller

performance is best with RL_SPI close to the real value of the load resistor.

MSB

LSB

1111

Res_CCV

RL_SPI

Parit

free

Table 55. Configuration register 3

Configuration register

Number of bits

Bit location

Name

Reset current controller values

2 bit

D9 - D8

Res_CCV

RL_SPI

8 bit

D7 - D0

RL_SPI

Table 56. Reset current controller values command

Bit 1

Bit 0

Combination

Not Valid

Reset

Normal Condition

Not Valid

Table 57. Load resistor value

SPI - Bit

8 Ω

4 Ω

2 Ω

1 Ω

1/2 Ω

1/4 Ω

1/8 Ω

1/16 Ω

RL_SPI

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