PT2000 datasheet(39/148 Pages) NXP

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NXP Semiconductors

PT2000

6.3

High-side pre-driver

The PT2000 provides seven independent high-side pre-drivers designed to drive the gate of external high-side configuration N-channel

logic level MOSFETs. These pre-drivers are dedicated to load driving like injectors or solenoids, and integrate diagnostics features.

Internal to the device is a gate to source pull-down resistor holding the external MOSFETs in the off state while the device is in a power

on reset state (RSTB low). The external FET can be connected to either VBATT or a higher voltage VBOOST, limitation in the diagnostics

is described in the next chapter, only HS2, 4, and 6 can use VBOOST voltage for diagnostics.

The high-side pre-drivers are supplied by an external bootstrap capacitor connected between the S_HSX and B_HSX pins. The driver

slew rate can be selected individually for each of the seven drivers, among a set of four value pairs by the SPI registers (refer to Table 99,

Hs_slewrate (171h)).

Figure 9. High-side pre-driver block diagram

The high-side pre-driver is intended to drive the gate of an external logic level MOSFET in a high-side configuration. The logic command,

hsx_command, to switch the external MOSFET, is provided by the microcores. This command is generated for taking into account the

following signals:

• Logic command coming from channel logic (hsx_in)

• VCCP undervoltage signals (uv_vccp) from VCCP UV monitor: in case of an undervoltage, the external MOSFET is switched off

• VCC5 undervoltage signals (uv_vcc5) from VCC5 UV monitor: in case of an undervoltage, the external MOSFET is switched off

• VBOOST undervoltage signals (uv_vboost) from boost voltage monitor: in case of an undervoltage, the external MOSFET is

switched off if this feature is enabled (refer to Table 162, driver_status (1B2h)

• Signal cksys_drven coming from the clock monitoring: in case of a missing clock (PLL not locked), the external MOSFET is switched

off. This function is disabled by default and can be enabled by setting the cksys_missing_disable_driver bit high (refer to Table 152,

backup_clock_status (1A8h))

• At the high-side pre-driver block signal, DrvEn is added to the control signal for the driver. As long as the DrvEn signal is negated

(low), the high-side pre-driver is switched off. The high-side pre-driver 5 and 7 include a feature to override the switch off path via

the DrvEn signal. As long as the signal hsx_en_ovr is high (only for HS5 and HS7), the pre-driver is not influenced by DrvEn. (refer

to Table 178, HSx_output_config (1DA, 1DDh, 1E0h, 1E3h, 1E6h, 1E9h))

Charge

Pump

LDO

Load

AGND

DRVEN

D_LSx

G_LSx

VBOOST/VBAT

B_HSx

G_HSx

S_HSx

VCC5

VBOOST

VCCP

VBAT

uv_vcc5

uv_vccp

uv_vboost

cksys_drven

hsx_in

hsx_slewrate

hsx_command

hsx_drven

hs5/7_en_ovr

MC33PT2000

PGND

hs1/2/3/4/6

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