L9374LF datasheet(60/80 Pages) STMICROELECTRONICS

60 / 80 page

Programmers guide

L9374LF

60/80

DocID025414 Rev 1

Edge shaping (EDGE_SH)

Edge Shaping option allows the user to incorporate a slower more EMI sensitive slope to

the output waveform. By setting these bits the user is able to turn on / off edge shaping for

all outputs (see Section 3.3.4: Output timing characteristics). There is no option to select

individual outputs for edge shaping. When performing the SVDT it is recommended that

Edge Shaping be turned OFF.

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

command to be ignored and subsequent returning Status Register data to be set to all ‘1’s.

5.1.4

Fast switch-on (FSON) register (address 3)

If the fast switch on enable bit (FSON_EN) is set, writing 1 to the bit ONX switches the

output on 100%. A ‘0’ written to the fast switch on enable pin will disable this function. Any

outputs on as a result of an ONx bit being high will be turned off.

The fast switch off all bits (FSOFF_ALL) turn off all channels immediately (it does not

depend on the synchronization) and clear all bits at this address. The fast switch off all

(FSOFF_ALL) command has the highest priority.

Table 46. Edge shaping

Bit 1

Bit 0

Combination

Not Valid

Edge Shaping ON for all outputs

Edge Shaping OFF for all outputs

Not Valid

MSB

LSB

xxxxxxx

ON4

ON3

ON2

ON1

Parit

free free free free free free free

Table 47. Fast switch-on

Configuration register

Bit Location

Name

Switch on Q1

ON1

Switch on Q2

ON2

Switch on Q3

ON3

Switch on Q4

ON4

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