MM912F634CV2AP datasheet(80/335 Pages) FREESCALE

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Functional Description and Application Information

High Side Drivers - HS

MM912F634

Freescale Semiconductor

4.11

High Side Drivers - HS

These outputs are two High Side drivers, intended to drive small resistive loads or LEDs incorporating the following features:

•

PWM capability via the PWM Module

•

Open load detection

•

Current limitation

•

Over-temperature shutdown (with maskable interrupt)

•

High voltage shutdown - HVI (software maskable)

•

Cyclic-Sense, See Section 4.8, “Wake-up / Cyclic Sense"

4.11.1

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 HS1OL and HS2OL in the High Side Status Register (HSSR).

4.11.2

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.

That the driver operates in the current limitation area is indicated with the bits HS1CL and HS2CL in the High Side Status Register

(HSSR).

4.11.3

Over-temperature Protection (HS Interrupt)

Both high side drivers are protected against over-temperature. In over-temperature conditions, 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

A thermal shutdown of the high side drivers is indicated by setting the HSOT bit in the High Side Status Register (HSSR).

A write to the High Side Control Register (HSCR), when the over-temperature condition is gone, will re- enable the high side

drivers.

4.11.4

High Voltage Shutdown

In case of a high voltage condition (HVI), and if the high voltage shutdown is enabled (bit HVSDE in the High Side Control Register

(HSCR) 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.

4.11.5

Sleep And Stop Mode

The high side drivers can be enabled to operate in Sleep and Stop mode for cyclic sensing. See Section 4.8, “Wake-up / Cyclic

Sense"

4.11.6

PWM Capability

Section 4.13, “PWM Control Module (PWM8B2C)"

MM912F634CV2AP Datasheet(PDF) 80 Page - Freescale Semiconductor, Inc

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