MC34921 Datasheet, PDF (31/36 Pages) List of Unclassifed Manufacturers – Configurable Motor Driver IC with Power Supplies

FUNCTIONAL DEVICE OPERATION
LOGIC COMMANDS AND REGISTERS
LOGIC COMMANDS AND REGISTERS
Truth Tables use the following notations:
For inputs, I_LIMIT = 0 means TSD, I_LIMIT condition not encountered. I_LIMIT = 1 means TSD, I_LIMIT condition encountered.
For outputs XDCMA and XDCMB, 0 means low-side ON, 1 means high-side ON, Z means both OFF.
Table 19. DC Motors Truth Table
Xdca
X
X
X
X
X
0
0
0
1
1
1
Xdcb
X
X
X
X
X
0
1
1
0
0
1
XDCPWM
X
X
X
X
X
X
0
1
0
1
X
Inputs
RST
X
X
X
X
0
1
1
1
1
1
1
I_LIMIT Top
I_LIMIT Bottom
Thermal
Shutdown
(TSD)
X
X
1
0
1
0
1
0
0
1
1
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
Outputs
XDCMA
XDCMB
Z
Z
1
1
0
0
0
0
0
0
0
0
1
1
0
1
1
1
1
0
1
1
Table 20. Low-Side Out (LSOUT) Drivers Truth Table (Motor Driver Configured for H-bridge DC Motor)
Note The LSOUT terminals are controlled by the OUT1 and OUT2 signals (Bit 14 and Bit 15 in the NORMAL input frame).
LSOUT is only available when Motor Driver C is configured as DC motor. (Set Bit 4 = 1 in CONFIG frame.)
Inputs
Output
Xdca
X
X
X
Xdcb
X
X
X
XDCPWM
X
X
X
OUTx
X
X
0
RST
I_LIMIT Output
TSD
X
X
1
0
X
0
1
0
0
LSOUTx
OFF
OFF
OFF
X
X
X
1
1
0
0
ON
X
X
X
1
1
1
0
Limited
Analog Integrated Circuit Device Data
Freescale Semiconductor
34921
31