33911 datasheet(37/45 Pages) FREESCALE

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Analog Integrated Circuit Device Data

Freescale Semiconductor

33911

FUNCTIONAL DEVICE OPERATIONS

LOGIC COMMANDS AND REGISTERS

High Side Control Register - HSCR

This register controls the operation of the high side driver.

Writing to this register returns the High Side Status Register

(HSSR).

PWMHS1 - PWM Input Control Enable.

This write-only bit enables/disables the PWMIN input pin

to control the high side switch. The high side switch must be

enabled (HS1 bit).

1 = PWMIN input controls HS1 output.

0 = HS1 is controlled only by SPI.

HS1 - High Side Switch Control.

This write-only bit enables/disables the high side switch.

1 = HS1 switch on.

0 = HS1 switch off.

High Side Status Register - HSSR

This register returns the status of the high side switch and

is also returned when writing to the High Side Control

High Side thermal shutdown

A thermal shutdown of the high side drivers is indicated by

setting the HS1OP and HS1CL bits simultaneously.

HS1OP - High Side Switch Open-Load Detection

This read-only bit signals that the high side switch is

conducting current below a certain threshold indicating

possible load disconnection.

1 = HS1 Open Load detected (or thermal shutdown)

0 = Normal

HS1CL - High Side Current Limitation

This read-only bit indicates that the high side switch is

operating in current limitation mode.

1 = HS1 in current limitation (or thermal shutdown)

0 = Normal

Low Side Control Register - LSCR

This register controls the operation of the low side drivers.

Writing the Low Side Control Register (LSCR) will also return

the Low Side Status Register (LSSR).

PWMLx - PWM input control enable.

This write-only bit enables/disables the PWMIN input pin

to control the respective low side switch. The corresponding

low side switch must be enabled (LSx bit).

1 = PWMIN input controls LSx.

0 = LSx is controlled only by SPI.

LSx - LSx switch control.

This write-only bit enables/disables the corresponding low

side switch.

1 = LSx switch on.

0 = LSx switch off.

Low Side Status Register - LSSR

This register returns the status of the low side switches

and is also returned when writing to the LSCR.

Low Side thermal shutdown

A thermal shutdown of the low side drivers is indicated by

setting all LSxOP and LSxCL bits simultaneously.

LSxOP - Low Side Switch Open-Load Detection

This read-only bit signals that the low side switches are

conducting current below a certain threshold indicating

possible load disconnection.

1 = LSx Open-load detected (or thermal shutdown)

0 = Normal

LSxCL - Low Side Current Limitation

This read-only bit indicates that the respective low side

switch is operating in current limitation mode.

1 = LSx in current limitation (or thermal shutdown)

0 = Normal

Table 17. High Side Control Register - $6

Write

PWMHS1

HS1

Reset

Value

Reset

Condition

POR

POR, Reset Mode, ext_reset, HS1

overtemp or (VSOV & HVSE)

Table 18. High Side Status Register - $6/$7

Read

HS1OP

HS1CL

Table 19. Low Side Control Register - $8

Write

PWMLS2

PWMLS1

LS2

LS1

Reset

Value

Reset

Condition

POR

POR, Reset Mode, ext_reset, LSx

overtemp or (VSOV & HVSE)

Table 20. Low Side Status Register - $8/$9

Read

LS2OP

LS2CL

LS1OP

LS1CL

33911 Datasheet(PDF) 37 Page - Freescale Semiconductor, Inc

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