33912 datasheet(39/47 Pages) FREESCALE

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Analog Integrated Circuit Device Data

Freescale Semiconductor

33912

FUNCTIONAL DEVICE OPERATIONS

LOGIC COMMANDS AND REGISTERS

High Side Control Register - HSCR

This register controls the operation of the high side drivers.

Writing to this register returns the High Side Status Register

(HSSR).

PWMHSx - PWM Input Control Enable.

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

to control the respective high side switch. The corresponding

high side switch must be enabled (HSx bit).

1 = PWMIN input controls HSx output.

0 = HSx is controlled only by SPI.

HSx - HSx Switch Control.

This write-only bit enables/disables the corresponding

high side switch.

1 = HSx switch on.

0 = HSx switch off.

High Side Status Register - HSSR

This register returns the status of the high side switches

and is also returned when writing to the HSCR.

High Side thermal shutdown

A thermal shutdown of the high side drivers is indicated by

setting all HSxOP and HSxCL bits simultaneously.

HSxOP - High Side Switch Open-Load Detection

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

conducting current below a certain threshold indicating

possible load disconnection.

1 = HSx Open Load detected (or thermal shutdown)

0 = Normal

HSxCL - High Side Current Limitation

This read-only bit indicates that the respective high side

switch is operating in current limitation mode.

1 = HSx 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

PWMHS2

PWMHS1

HS2

HS1

Reset

Value

Reset

Condition

POR

POR, Reset Mode, ext_reset, HSx

over-temp or (VSOV & HVSE)

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

Read

HS2OP

HS2CL

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

over-temp or (VSOV & HVSE)

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

Read

LS2OP

LS2CL

LS1OP

LS1CL

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