TMCM-342 Manual V1.01
20/26
Copyright © 2008, TRINAMIC Motion Control GmbH & Co. KG
5.8.3
One Limit Switch for circular systems
If a circular system is used (Figure 5.18), only one reference switch is necessary, because there are no
end-points in such a system.
motor
ref switch
REF_L_x
eccentric
Figure 5.18: One reference switch
Note:
In the actual TMCL, a function is available, which turns the motor left until the reference switch
has been detected. Then the actual and target position are set to zero. In the future, two and three
limit switches will also be supported.
5.9
Serial Peripheral Interface (SPI)
On-board communication is performed via the Serial Peripheral Interface (SPI), where the
microcontroller acts as master. For adaptation to user requirements, the user has access to this
interface via the 68-pin connector. Furthermore three chip select lines can be used for addressing of
external devices.
Pin Number
Direction
Name
Limits
Description
11
Out
SPI_SEL0
TTL
Chip Select Bit0
13
Out
SPI_SEL1
TTL
Chip Select Bit1
15
Out
SPI_SEL2
TTL
Chip Select Bit2
12
Out
SPI_CLK
TTL
SPI Clock
14
In
SPI_MISO
TTL
SPI Serial Data In
16
Out
SPI_MOSI
TTL
SPI Serial Data Out
Table 5.8: Pinout Serial Peripheral Interface
