MC34929 Freescale Semiconductor, MC34929 Datasheet - Page 17

• Manufacturer Part Number: MC34929
• Description: Brushless DC 1.0 AMP 28 VOLT Motor Driver IC
• Manufacturer: Freescale Semiconductor

Table 6. Suspend Mode and Protection Modes Truth Table
Notes
Analog Integrated Circuit Device Data
Freescale Semiconductor
RUN: Start at “L” and Stop at “H”. “H->L” indicates input is toggled.
DIR: CW direction at “L” and CCW direction at “H” and “Flip” indicates change of logic level to opposite state.
“Under Voltage”, “Stall Detect”, “Current LImit”, Short Circuit”, “TSD”, and “Stall Protect” are “High” active internal signals. “Reset” is a “Low”
active internal signal.
Under Voltage: H->L indicates removing then re-applying power (V+).
“Run” status indicates operation in 3-phase commutation mode.
Commanding a “Stop” state from a “Run” state will always result in a transition through the “Controlled Brake” state (to prevent high voltage
Back-EMF), before changing to OFF (high-Z).
SUSPEND MODE
THERMAL SHUTDOWN
SHORT CIRCUIT PROTECTION
CURRENT LIMIT DETECTION
STALL DETECTION AND PROTECTION
UNDER VOLTAGE DETECTION
NORMAL MODE
H->L
RUN
H
X
L
L
L
L
L
L
L
L
L
DIR
Flip
X
X
X
X
X
X
X
X
X
X
X
Voltage
Under
H->L
H->L
X
X
X
X
H
L
L
L
L
L
Detect
Stall
X
X
X
X
H
X
L
L
L
L
L
L
Current
Limit
H
X
X
X
X
L
L
L
L
L
L
L
Circuit
Short
X
X
H
X
L
L
L
L
L
L
L
L
TSD
H
X
L
L
L
L
L
L
L
X
L
L
Reset
X
X
H
H
H
H
H
H
H
H
H
L
Protect
LOGIC COMMANDS AND REGISTERS
Stall
X
X
X
X
H
H
L
L
L
L
L
L
FUNCTIONAL DEVICE OPERATION
PHASES
Int.PWM
L->Z
L->Z
Run
Run
Run
Run
Run
Z
Z
Z
L
3XTACH
TACH
Stall
Run
Run
Run
Run
Run
Run
Run
H
H
H
H
HB
Off
Off
Off
On
On
On
On
On
On
Off
On
On
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