L9907TR datasheet(31/49 Pages) STMICROELECTRONICS

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DS11800 Rev 5

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L9907

SPI operation

CMD0 register - Driver settings: B(15:13) = 000

DT1 and DT0 (B9,B8) are used to select dead time (tDT) parameter: ('00' default

condition at Power-On Reset)

IG_1 and IG_0 (B7,B6) are used to select turn on/off current value: ('00' default

condition at Power-On Reset)

G21 and G20 (B5,B4) are used to select current sense amplifier 2 gain: ('00'

default condition at power on reset)

Table 24. SDI frame structure

Bit position

Description

B(15:13)

SDI command selection bits, used to select the SPI operation to be implemented

B11 (Par)

odd parity bit

B10 (WE)

Write Enable bit.

A SPI cycle with WE=1 transfers the SDI data to the addressed CMDx register.

A SPI cycle with WE=0 transfers the content of the addressed CMDx register to the SDO data of

the following SPI cycle.

B(9:0)

the SDI setting bits to be internally stored for device operation in case of writing SPI cycle

Table 25. Dead time parameter

Dead time

B9 = DT1

B8 = DT0

100-200ns

300-500 ns

700-1000 ns

1000-1500 ns

Table 26. Turn on/off current

Percentage

B7 = IG_1

B6 = IG_0

25%

50%

75%

100%

Table 27. Current sense amplifier 2 gain

Gain

B5=

G21

B4=

G20

300

100

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