VNF9D5FTR datasheet(53/106 Pages) STMICROELECTRONICS

Part #	VNF9D5FTR

Description	2-channel high-side driver with STi²Fuse protection for automotive power distribution applications

PDF	106 Pages

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Manufacturer	STMICROELECTRONICS [STMicroelectronics]

Direct Link	http://www.st.com

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53 / 106 page

An analogue multiplexer has been implemented to connect the different channels to the amplifier and the ADC

block. Due to the current sense amplifier settling time when switching from the current sense mode of one

channel, to the current sense mode of another channel, a priority management is implemented to control the time

when the data conversion can be done in a safe/stable way and to arbitrate the concurrent ADC sampling

requests (see next figures).

Figure 22. Conversion window generation

Conv_wdwx

Outputx

Channelx

tON

A minimum conversion time (tON_CS(min)) is defined to allow the signal stabilization at the input of the ADC

converter and considering the sampling time. The user should manage the phase shift in a way that maximum two

channels can be sampled in the same time window.

Figure 23. Minimum ON time for digital current sense availability

Conv_wdwx

Outputx

Channelx

tON_CS(min)

The sequence of channels to be converted is managed through an internal stack:

VNF9D5F

Diagnostic

DS13946 - Rev 6

page 53/106

VNF9D5FTR Datasheet(PDF) 53 Page - STMicroelectronics