LM629N-8/NOPB National Semiconductor, LM629N-8/NOPB Datasheet - Page 13

• Manufacturer Part Number: LM629N-8/NOPB
• Description: IC CONTROLLER PREC MOTION 28-DIP
• Manufacturer: National Semiconductor

Specifications of LM629N-8/NOPB

• Applications: DC Motor Controller, Servo
• Number Of Outputs: 1
• Voltage - Supply: 4.5 V ~ 5.5 V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Through Hole
• Package / Case: 28-DIP (0.600", 15.24mm)
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Current - Output: -
• Voltage - Load: -
• Other names: *LM629N-8; *LM629N-8/NOPB; LM629N-8

Initialization Commands
DFH COMMAND: DEFINE HOME
This command declares the current position as “home”, or
absolute position 0 (Zero). If DFH is executed during motion
it will not affect the stopping position of the on-going move
unless command STT is also executed.
Interrupt Control Commands
The following seven LM628 user commands are associated
with conditions which can be used to interrupt the host
computer. In order for any of the potential interrupt condi-
tions to actually interrupt the host via Pin 17, the correspond-
ing bit in the interrupt mask data associated with command
MSKI must have been set to logic high (the non-masked
state).
The identity of all interrupts is made known to the host via
reading and parsing the status byte. Even if all interrupts are
masked off via command MSKI, the state of each condition
is still reflected in the status byte. This feature facilitates
polling the LM628 for status information, as opposed to
interrupt driven operation.
SIP COMMAND: SET INDEX POSITION
After this command is executed, the absolute position which
corresponds to the occurrence of the next index pulse input
will be recorded in the index register, and bit 3 of the status
byte will be set to logic high. The position is recorded when
both encoder-phase inputs and the index pulse input are
logic low. This register can then be read by the user (see
description for command RDIP) to facilitate aligning the defi-
nition of home position (see description of command DFH)
with an index pulse. The user can also arrange to have the
LM628 interrupt the host to signify that an index pulse has
occurred. See the descriptions for commands MSKI and
RSTI.
LPEI COMMAND: LOAD POSITION ERROR FOR
INTERRUPT
An excessive position error (the output of the loop summing
junction) can indicate a serious system problem; e.g., a
stalled rotor. Instruction LPEI allows the user to input a
threshold for position error detection. Error detection occurs
when the absolute magnitude of the position error exceeds
the threshold, which results in bit 5 of the status byte being
set to logic high. If it is desired to also stop (turn off) the
motor upon detecting excessive position error, see com-
mand LPES, below. The first byte of threshold data written
with command LPEI is the more significant. The user can
have the LM628 interrupt the host to signify that an exces-
sive position error has occurred. See the descriptions for
commands MSKI and RSTI.
Command Code:
Data Bytes:
Executable During Motion: Yes
Command Code:
Data Bytes:
Executable During Motion: Yes
Command Code:
Data Bytes:
Data Range:
Executable During Motion: Yes
02 Hex
None
03 Hex
None
1B Hex
Two
0000 to 7FFF Hex
(Continued)
13
LPES COMMAND: LOAD POSITION ERROR FOR
STOPPING
Instruction LPES is essentially the same as command LPEI
above, but adds the feature of turning off the motor upon
detecting excessive position error. The motor drive is not
actually switched off, it is set to half-scale, the offset-binary
code for zero. As with command LPEI, bit 5 of the status byte
is also set to logic high. The first byte of threshold data
written with command LPES is the more significant. The user
can have the LM628 interrupt the host to signify that an
excessive position error has occurred. See the descriptions
for commands MSKI and RSTI.
SBPA COMMAND:
This command enables the user to set a breakpoint in terms
of absolute position. Bit 6 of the status byte is set to logic
high when the breakpoint position is reached. This condition
is useful for signaling trajectory and/or filter parameter up-
dates. The user can also arrange to have the LM628 inter-
rupt the host to signify that a breakpoint position has been
reached. See the descriptions for commands MSKI and
RSTI.
SBPR COMMAND:
This command enables the user to set a breakpoint in terms
of relative position. As with command SBPA, bit 6 of the
status byte is set to logic high when the breakpoint position
(relative to the current commanded target position) is
reached. The relative breakpoint input value must be such
that when this value is added to the target position the result
remains within the absolute position range of the system
(C0000000 to 3FFFFFFF hex). This condition is useful for
signaling trajectory and/or filter parameter updates. The user
can also arrange to have the LM628 interrupt the host to
signify that a breakpoint position has been reached. See the
descriptions for commands MSKI and RSTI.
MSKI COMMAND: MASK INTERRUPTS
The MSKI command lets the user determine which potential
interrupt condition(s) will interrupt the host. Bits 1 through 6
of the status byte are indicators of the six conditions which
are candidates for host interrupt(s). When interrupted, the
host then reads the status byte to learn which condition(s)
occurred. Note that the MSKI command is immediately fol-
lowed by two data bytes. Bits 1 through 6 of the second (less
significant) byte written determine the masked/unmasked
status of each potential interrupt. Any zero(s) in this 6-bit
Command Code:
Data Bytes:
Data Range:
Executable During Motion: Yes
Command Code:
Data Bytes:
Data Range:
Executable During Motion: Yes
Command Code:
Data Bytes:
Data Range:
Executable During Motion: Yes
Command Code:
Data Bytes:
Data Range:
Executable During Motion: Yes
1A Hex
Two
0000 to 7FFF Hex
20 Hex
Four
C0000000 to 3FFFFFFF Hex
21 Hex
Four
See Text
1C Hex
Two
See Text
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