VNF1048F datasheet(19/52 Pages) STMICROELECTRONICS

Part #	VNF1048F

Description	High-side switch Controller with intelligent fuse protection for 12 V, 24 V and 48 V automotive applications

PDF	52 Pages

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Manufacturer	STMICROELECTRONICS [STMicroelectronics]

Direct Link	http://www.st.com

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19 / 52 page

VDS Detection Self Test result is the difference between converted value obtained during Self Test execution

and the value already stored in SR#4 (VDS field), corresponding to the normal measurement performed during

operation; such delta measure result is stored in SR#5 (S_T_VDS field) together with the Self Test status.

During Self Test execution it is also possible to emulate external FET VDS fault condition by playing with

programmable thresholds available through register CR#2 (VDS_THR field); fault emulation result is stored in

SR#5 (S_T_VDS_MAX1 bit field).

To be noted that diagnostic fault for normal operation (VDS_MAX, SR#1) is inhibited during execution, while all

the others are kept enabled.

The transition from Self Test state to Unlocked state is automatically guaranteed after the test is completed

(around 10 μs) or if the test is stopped through S_T_STOP = 1 (Self Test aborted).

The transition from the Self Test state to the Locked state can occur in case of watchdog timeout or HWLO = 1

(Self Test aborted).

Figure 7. VDS monitor self test flow sequence

VNF1048F

External FET VDS Detection Self Test

DS13084 - Rev 6

page 19/52

VNF1048F Datasheet(PDF) 19 Page - STMicroelectronics