INTERFAC E C O N T R O L L E R I N T E G R A T E D C I R C U ITS TM C 4 23 Trip le Incre mental Enc oder Int erface a nd Com panion I C for th e TMC428 M A IN CH A R AC T ER IS T IC S INFO The TMC423 is a triple incremental encoder input chip, which • incremental encoder interface for three 2 or 3 channel encoders interfaces to any SPI™ compatible controller. It integrates 24 bit • TMC428 step / direction interface extension counters – one for each encoder – to provide a high position resolution without CPU interaction. The TMC423 is intended as a • TMC428 reference switch interface companion chip for the TMC428 but not limited to this. Both ICs • TMC428 interrupt de-multiplexer together enable the realization of a motion control system of • control of LED 6 x 4 Matrix three axis with encoder feedback. This provides position verifica- • control of key 6 x 4 matrix tion or stabilization by implementation of some additional software. Further, the TMC423 allows dynamic resolution adaptation for direct comparison of encoder counters with motors using INTERFACE ELECTRICAL DATA • SPI interface to microcontroller • 2.5V and 5V supply required • 20mA LED driver outputs different micro step resolution. • 5V CMOS / TTL compatible IOs All encoder counters can be latched synchronously, or whenever PACKAGE a null channel event occurs, providing a position on strobe holding function. The TMC423 also provides a step / direction • TQFP100 • RoHS compliant 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 1-33x Encoder Encoder Encoder 3 6x4 LED 6x4 Key Matrix control stop switches 6 SPI 3x Encoder Interface SPI to µC Ref. Demux µC Motion Controller 3 e.g. TMCM428 REF switches 3x step/dir converter 3x3x 3x Driver Driver Driver step/dir step/dir step/dir OR DE R C O DE D E S C RI P T I ON TMC423 3-axis encoder interface TQFP100 package www.trinamic.com – for detailed information and datasheets 10