INT E R F A C E C O N T R O L L E R
I N T E GR A T E D C I R C U ITS
TMC
42 3
T ri p l e I n c r e m e n t a l
Encoder Interface and
C o m pa n i o n I C f o r t h e T M C428
M A IN CH A R AC T ER IS T IC S
INFO
The TMC423 is a triple incremental encoder input chip, which
interfaces to any SPI™ compatible controller. It integrates 24 bit
counters – one for each encoder – to provide a high position
resolution without CPU interaction. The TMC423 is intended as a
companion chip for the TMC428 but not limited to this. Both ICs
together enable the realization of a motion control system of
three axis with encoder feedback. This provides position verifica-
tion or stabilization by implementation of some additional soft-
ware. Further, the TMC423 allows dynamic resolution adaptation
for direct comparison of encoder counters with motors using
different micro step resolution.
All encoder counters can be latched synchronously, or whenever
PACKAGE
INTERFACE
ELECTRICAL
DATA
• incremental encoder interface for three
2 or 3 channel encoders
• TMC428 step / direction interface
extension
• TMC428 reference switch interface
• TMC428 interrupt de-multiplexer
• control of LED 6 x 4 Matrix
• control of key 6 x 4 matrix
• SPI interface to microcontroller
• 2.5V and 5V supply required
• 20mA LED driver outputs
• 5V CMOS / TTL compatible IOs
• TQFP100
• RoHS compliant
a null channel event occurs, providing a position on strobe
holding function. The TMC423 also provides a step / direction
output with programmable signal shaping for the TMC428
as well as a multiplexer function for the TMC428 reference
switches. Additionally, the TMC423 can drive an LED matrix and
read out a switch matrix, to support systems with keyboard user
interaction.
TMC423
1-3
1-3
3x
Encoder
Encoder
Encoder
3
6x4 LED
6x4 Key
3x
Encoder
Interface
SPI
to µC
µC
Matrix
control
Motion
Controller
3
stop
switches
6
Ref.
Demux
3x
step/dir
converter
REF
switches
e.g. TMCM428
SPI
3x
3x
3x
Driver
Driver
Driver
step/dir
step/dir
step/dir
ORDER CODE
DESC RIP TIO N
TMC423
3-axis encoder interface TQFP100 package
www.trinamic.com
– for detailed information and datasheets
10
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