PT2000 datasheet(67/148 Pages) NXP

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NXP Semiconductors

PT2000

7.9.1

DrvEn shutoff path of the high-side pre-driver

The DrvEn path for the HS pre-drivers HS1 to HS4 and HS6 is implemented to ensure a high safety level. It is designed with a high level

of independence, because there is a direct wire from this pin to the HS pre-driver input and the failure rate of this functionally is very low.

If any of the following failures occur, the shut off path is still functional or the driver must be in a safe off state. These failures are:

• Missing clock signal for the device digital core

• Missing supply voltage for the device digital core

• Missing supply voltage of level shifter

• Missing supply voltage (VBS) of HS pre-driver

• Single damaged pre-driver

7.9.2

DrvEn Shutoff path of the low-side pre-driver

The DrvEn path for the LS pre-drivers LS1 to LS5 is implemented to ensure a high safety level. It is designed with a high level of

independence, because there is a direct wire from this pin to the HS pre-driver input and the failure rate of this functionally is very low.

If any of the following failures occur, the shut off path is still functional or the driver must be in a safe off state. These failures are:

• Missing clock signal for the device digital core

• Missing supply voltage for the device digital core

• Missing supply voltage VCCP of LS pre-driver

• Single damaged pre-driver

Table 43. DrvEn path for HS pre-drivers

HS pre-driver

Implementation

HS1

Direct wire from the DrvEn pin to the HS pre-driver input. High independence and low FIT rate.

HS2

HS3

HS4

HS6

HS5

Configuration option for the DrvEn path. The signal is routed via the digital core only.

HS7

Table 44. DrvEn path for LS pre-drivers

LS Pre-driver

Implementation

LS1

Direct wire from the DrvEn pin to the LS pre-driver input. High independence and low FIT rate.

LS2

LS3

LS4

LS6

LS5

Configuration option for the DrvEn path. The signal is routed via the digital core only.

LS7

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