PT2000 datasheet(40/148 Pages) NXP

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NXP Semiconductors

PT2000

The truth table describing the status of hsx_command signal is given in Figure 21.

The pre-driver G_HSx output is set according to hsx_command:

• When the hsx_command is high, the G_HSx pin is driven high (pull-up to B_HSx voltage);

• When the hsx_command is low, the G_HSx pin is driven low (pull-down to S_HSx voltage).

6.3.1

High-side pre-driver slew rate control

The driver strength can be selected individually for each of the drivers among a set of values by the SPI registers. There are four selectable

driver strengths. The strength for the rising and falling edge can be chosen individually for each driver. Changing the rising edge affects

the falling edge such as to retain the same absolute slew rate. The given value of voltage slew rate is only an indication and is dependent

on the used MOSFET and the additional gate circuit (refer to Slew rate high-side and low-side selection register).

6.3.2

Safe state of high-side pre-driver

When reset (RSTB) is asserted or DRV_EN is negated, the G_HSx output is immediately forced to a low level, thus switching off the

external MOSFET, to guarantee a safe condition while the device is not operating. In addition to this, an integrated pull-down resistor

RPD_HSX between G_HSx and S_HSx of about 1.0 MΩ keeps the external MOSFET in the off state even when the bootstrap voltage is low.

Table 21. High-side pre-driver truth table

DRV_EN

hs5/7_en_ovr

uv_vccp

uv_vcc5

uv_vboost

cksys_drven

hsx_in

hsx_command

Driver status

off

on (hs5/7) / off

(other hsx)

Table 22. Slew rate settings for HS pre-drivers

hsx_slewrate(1:0)

Slew-rate/ V/µS

RDS(ON)_PMOS

(switching on)/

RDS(ON)_NMOS

(switching off)/

300

14.6

5.9

169

12.5

337

138

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