33800 datasheet(18/39 Pages) FREESCALE

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Analog Integrated Circuit Device Data

Freescale Semiconductor

33800

FUNCTIONAL DESCRIPTION

FUNCTIONAL INTERNAL BLOCK DESCRIPTION

Figure 5. Functional Block Diagram

ANALOG CONTROL CIRCUITRY

The 33800 is designed to operate from 5.0 to 36V on the

VPWR pin. The VPWR pin supplies power to all internal

regulators, analog and logic circuit blocks. The VDD supply is

used for setting communication threshold levels and

supplying power to the SO driver. This IC architecture

provides low quiescent current Sleep Modes. Applying

VPWR to the device will cause a Power On Reset (POR). The

on-chip oscillator supports the selectable PWM frequency

and duty cycle. The on-chip voltage regulator and bandgap

supply the required voltages to the internal circuitry.

MCU INTERFACE AND OUTPUT CONTROL

The device is designed with six flexible PWM gate driver

outputs. Each driver may be controlled directly from the MCU

and may be programmed through the SPI for a specific

frequency and duty cycle.

LOW–SIDE DRIVERS: OUT1 – OUT8

The 33800 provides flexible control of 8 low side driver

outputs. Outputs 1 and 2 are specifically designed with higher

current limits to accommodate lamp inrush current. The

device allows for parallel control of the outputs or SPI control

through the use of several input command words.

CONSTANT CURRENT LOW SIDE DRIVERS: CCD1

AND CCD2

The CCD1/CCD2 constant current controllers are

switching hysteretic current controllers with a superimposed

dither. The controllers are designed to provide a

programmable constant current through a solenoid valve.

Fluid flow is controlled by the amount of current run through

the driven solenoid valve.

GATE PRE-DRIVERS: GD1 – GD6

The GD1 – GD6 pins are the gate drive outputs for external

MOSFETS. They can be PWM’ed with speed and duty cycle

choices per the SPI command registers. Internal to the device

is a Gate to Source resistor designed to hold the external

MOSFET in the OFF state while the device is in POR.

33800 Datasheet(PDF) 18 Page - Freescale Semiconductor, Inc

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