TMC5161 DATASHEET (Rev. 1.01 / 2018-NOV-20)
25
5.4 Addressing Multiple Slaves
ADDRESSING ONE OR TWO SLAVES
If only one or two TMC5161 are addressed by a master using a single UART interface, a hardware
address selection can be done by setting the NAI pins of both devices to different levels.
ADDRESSING UP TO 255 SLAVES
A different approach can address any number of devices by using the input NAI as a selection pin.
Addressing up to 255 units is possible.
TMC5161
#1
TMC5161
#2
TMC5161
#3
NAI
NAI
NAI
NAO
NAO
+VIO
RIDLE
Master CPU
(µC with UART,
software
switches TXD to
hi-Z for
TXD
RXD
RIDLE forces stop bit level in idle conditions,
3k3 is sufficient with 14 slaves
receiving)
EXAMPLE FOR ADDRESSING UP TO 255 TMC5161
Addressing phase 1:
Addressing phase 2:
Addressing phase 3:
Addressing phase 4:
Addressing phase X:
address 0, NAO is high
address 1
address 0, NAO is high
address 1
program to address 254 & set NAO low
address 254
address 1
program to address 253 & set NAO low
address 253
address 0
address 254
program to address 252 & set NAO low
continue procedure
Figure 5.1 Addressing multiple TMC5160 / TMC5161 via single wire interface using chaining
PROCEED AS FOLLOWS:
-
-
Tie the NAI pin of your first TMC5161 to GND.
Interconnect NAO output of the first TMC5161 to the next drivers NAI pin. Connect further
drivers in the same fashion.
-
-
Now, the first driver responds to address 0. Following drivers are set to address 1.
Program the first driver to its dedicated slave address. Note: once a driver is initialized with
its slave address, its NAO output, which is tied to the next drivers NAI has to be programmed
to logic 0 in order to differentiate the next driver from all following devices.
Now, the second driver is accessible and can get its slave address. Further units can be
programmed to their slave addresses sequentially.
-
www.trinamic.com
TRINAMIC [ TRINAMIC MOTION CONTROL GMBH & CO. KG. ]
