Analog Integrated Circuit Device Data

Freescale Semiconductor

15

33931

FUNCTIONAL DEVICE OPERATION

LOGIC COMMANDS AND REGISTERS

LOGIC COMMANDS AND REGISTERS

Figure 12. 33931 Power Stage Operation

Table 5. Truth Table

The tri-state conditions and the status flag are reset using D1 or EN/D2. The truth table uses the following notations: L = LOW,

H = HIGH, X = HIGH or LOW, and Z = High-impedance. All output power transistors are switched off.

Device State

Input Conditions

Status

Outputs

EN/D2

D1

IN1

IN2

SF

OUT1

OUT2

Forward

H

L

H

L

H

H

L

Reverse

H

L

L

H

H

L

H

Free Wheeling Low

H

L

L

L

H

L

L

Free Wheeling High

H

L

H

H

H

H

H

Disable 1 (D1)

H

H

X

X

L

Z

Z

IN1 Disconnected

H

L

Z

X

H

H

X

IN2 Disconnected

H

L

X

Z

H

X

H

D1 Disconnected

H

Z

X

X

L

Z

Z

Under-voltage Lockout(29)

H

X

X

X

L

Z

Z

Over-temperature(30)

H

X

X

X

L

Z

Z

Short-circuit(30)

H

X

X

X

L

Z

Z

Sleep Mode EN/D2

L

X

X

X

H

Z

Z

EN/D2 Disconnected

Z

X

X

X

H

Z

Z

Notes

29.

In the event of an under-voltage condition, the outputs tri-state and status flag is SET logic LOW. Upon under-voltage

recovery, status flag is reset automatically or automatically cleared and the outputs are restored to their original operating

condition.

30.

When a short-circuit or over-temperature condition is detected, the power outputs are tri-state latched-OFF independent of

the input signals and the status flag is latched to logic LOW. To reset from this condition requires the toggling of either D1,

OUT1

OUT2

PGND

VPWR

VPW R

PGND

LOAD

Load

Current

Forward

OFF

ON

ON

OFF

OUT1

OUT2

PGND

OFF

ON

ON

OFF

VPWR

VPWR

PGND

LOAD

Load

Current

Reverse

OUT1

OUT2

PGND

VPWR

VPWR

PGND

LOAD

Load

Current

High-Side Recirculation

(Forward)

ON

OFF

ON

OFF

OUT1

OUT2

PGND

VPWR

VPWR

PGND

LOAD

Load

Current

Low-Side Recirculation

(Forward)

ON

ON

OFF

OFF