PT2000 datasheet(42/148 Pages) NXP

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NXP Semiconductors

PT2000

6.4

High-side VDS and VSRC monitor

The PT2000 monitors VDS and VSRC for diagnostic purposes across each high-side to detect any fault occurring on the external

MOSFET. The drain and source voltages of the connected MOSFETs are needed for VDS monitoring. To save pins, the high-side VDS

monitors have no dedicated drain pins, and the drain voltage of the MOSFETs is available via pins VBATT, for the MOSFETs connected

to battery voltage (HS1, HS3, HS5, HS7) and VBOOST or VBATT for the MOSFETs connected to boost or battery voltage (HS2, HS4, and

HS6).

6.4.1

HS1, 3, 5, 7 VDS monitoring

Figure 11. High-side 1, 3, 5, and 7 VDS VSRC and LS1-6 VDS monitoring

Four high-side VDS monitors for high-side pre-drivers 1, 3, 5, and 7 are composed of two comparators with programmable thresholds, the

first one sensing the voltage between VBATT and the source pin S_HSx and the second one sensing the voltage between the source pin

S_HSx and PGND (voltage across the free-wheeling element, either a diode or a MOSFET). A simplified schematic of the high-side VDS

monitors of HS pre-driver 1, 3, 5, and 7 is shown in Figure 11.

VDS and VSRC threshold are selectable by the SPI using registers vds_threshold_hs and vsrc_thresholds_hs (refer to VDS and VSRC

threshold selection). Selectable values are shown in Table 23.

VBATT

G_LSx

VCCP

lsx_vds_threshold (3:0)

PGND

Load

D_LSx

Voltage

Threshold

lsx_vds_fbk

B_HSx

G_HSx

S_HSx

VBOOST / VBAT

hsx_vds_threshold (3:0)

Voltage

Threshold

hsx_src_threshold (3:0)

Voltage

Threshold

hsx_src_fbk

–

VCC5

hsx_vds_Vbatt_fbk

–

HS1/3/5/7

LS1-6

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