33912 datasheet(30/47 Pages) FREESCALE

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Analog Integrated Circuit Device Data

Freescale Semiconductor

33912

FUNCTIONAL DEVICE OPERATIONS

OPERATIONAL MODES

Figure 17. High Side Drivers HS1 and HS2

Open Load Detection

Each high side driver signals an open load condition if the

current through the high side is below the open load current

threshold.

The open load condition is indicated with the bits HS1OP

and HS2OP in the High Side Status Register (HSSR).

Current Limitation

Each high side driver has an output current limitation. In

combination with the over-temperature shutdown the high-

side drivers are protected against over-current and short-

circuit failures.

When the driver operates in the current limitation area, it is

indicated with the bits HS1CL and HS2CL in the HSSR.

Note: If the driver is operating in current limitation mode,

excessive power might be dissipated.

Over-temperature Protection (HS Interrupt)

Both high side drivers are protected against over-

temperature. In case of an over-temperature condition both

high side drivers are shut down and the event is latched in the

Interrupt Control Module. The shutdown is indicated as HS

Interrupt in the Interrupt Source Register (ISR).

A thermal shutdown of the high side drivers is indicated by

setting all HSxOP and HSxCL bits simultaneously.

If the bit HSM is set in the Interrupt Mask Register (IMR),

then an interrupt (IRQ) is generated.

A write to the High Side Control Register (HSCR), when

the over-temperature condition is gone, will re-enable the

high side drivers.

High-voltage Shutdown

In case of a high voltage condition and if the high voltage

shutdown is enabled (bit HVSE in the Mode Control Register

(MCR) is set) both high side drivers are shut down.

A write to the High Side Control Register (HSCR), when

the high voltage condition is gone, will re-enable the high side

drivers.

Sleep And Stop Mode

The high side drivers can be enabled to operate in Sleep

and Stop Mode for cyclic sensing. Also see Table 5,

Operating Modes Overview.

High Side - Driver

charge pump

open load detection

current limitation

overtemperture shutdown (interrupt maskable)

high voltage shutdown (maskable)

Control

on/off

Status

PWMIN

VDD

PWMHSx

HSx

HVSE

HSxOP

HSxCL

MOD1:2

Interrupt

Control

Module

HSx

VS2

VDD

Wakeup

Module

33912 Datasheet(PDF) 30 Page - Freescale Semiconductor, Inc

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