PT2000 datasheet(46/148 Pages) NXP

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NXP Semiconductors

PT2000

6.5.2

LS1 - LS6 VDS monitor

Figure 14. VDS monitoring LS1 to LS6

For VDS monitoring of the external low-side MOSFET, a comparator with programmable threshold is provided, sensing the voltage

between the drain pin D_LSx and PGND (VDS of the low-side MOSFET). If a sense resistor is connected between the low-side MOSFET

and ground, the voltage drop on the resistor is included in the measurement. VDS threshold are selectable by the SPI using

vds_threshold_ls registers (refer to Table 96, Vds_threshold_ls_Part 1 (16Fh)) and Table 97, Vds_threshold_ls_Part 2 (170h)). Selectable

values are shown in Table 26.

Table 26. Low-side VDS monitor threshold selection

lsx_vds _threshold(3:0)

Threshold Voltage LS VDS

0000

0.00

1001

0.10

1010

0.20

1011

0.30

1100

0.40

0001

0.50

0010

1.0

0011

1.5

0100

2.0

0101

2.5

0110

3.0

0111

3.5

G_LSx

VCCP

lsx_vds_threshold (3:0)

PGND

Load

D_LSx

Voltage

Threshold

lsx_vds_fbk

–

LS1-6

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