Datasheet

TMC246 DATA SHEET (V2.02 / Jul. 31st, 2006) 2
Copyright © 2005, TRINAMIC Motion Control GmbH & Co KG
FEATURES ............................................................................................................................................1
PINNING.................................................................................................................................................5
PACKAGE CODES...................................................................................................................................5
PQFP44 DIMENSIONS ..........................................................................................................................6
APPLICATION CIRCUIT / BLOCK DIAGRAM .....................................................................................7
PIN FUNCTIONS.....................................................................................................................................7
LAYOUT CONSIDERATIONS...............................................................................................................8
CONTROL VIA THE SPI INTERFACE..................................................................................................9
SERIAL DATA WORD TRANSMITTED TO TMC246......................................................................................9
SERIAL DATA WORD TRANSMITTED FROM TMC246..................................................................................9
NAME ...................................................................................................................................................9
TYPICAL WINDING CURRENT VALUES.....................................................................................................10
BASE CURRENT CONTROL VIA INA AND INB IN SPI MODE......................................................................10
CONTROLLING THE POWER DOWN MODE VIA THE SPI INTERFACE...........................................................10
OPEN LOAD DETECTION .......................................................................................................................11
STANDBY AND SHUTDOWN MODE..........................................................................................................11
POWER SAVING ...................................................................................................................................11
STALL DETECTION ............................................................................................................................12
USING THE SENSORLESS LOAD MEASUREMENT .....................................................................................12
IMPLEMENTING SENSORLESS STALL DETECTION ....................................................................................12
PROTECTION FUNCTIONS................................................................................................................13
OVERCURRENT PROTECTION AND DIAGNOSIS........................................................................................13
OVERTEMPERATURE PROTECTION AND DIAGNOSIS ................................................................................13
OVERVOLTAGE PROTECTION AND ENN PIN BEHAVIOR ...........................................................................13
CHOPPER PRINCIPLE........................................................................................................................14
CHOPPER CYCLE / USING THE MIXED DECAY FEATURE...........................................................................14
BLANK TIME ........................................................................................................................................14
BLANK TIME SETTINGS .........................................................................................................................14
CLASSICAL NON-SPI CONTROL MODE (STAND ALONE MODE) ................................................15
PIN FUNCTIONS IN STAND ALONE MODE.................................................................................................15
INPUT SIGNALS FOR MICROSTEP CONTROL IN STAND ALONE MODE..........................................................15
CALCULATION OF THE EXTERNAL COMPONENTS......................................................................16
SENSE RESISTOR................................................................................................................................16
EXAMPLES FOR SENSE RESISTOR SETTINGS..........................................................................................16
HIGH SIDE OVERCURRENT DETECTION RESISTOR R
SH
............................................................................16
MAKING THE CIRCUIT SHORT CIRCUIT PROOF.........................................................................................17
OSCILLATOR CAPACITOR .....................................................................................................................18
TABLE OF OSCILLATOR FREQUENCIES...................................................................................................18
PULLUP RESISTORS ON UNUSED INPUTS ...............................................................................................18
SLOPE CONTROL RESISTOR ................................................................................................................19
EXAMPLE FOR SLOPE SETTINGS ...........................................................................................................19
ABSOLUTE MAXIMUM RATINGS......................................................................................................20
ELECTRICAL CHARACTERISTICS...................................................................................................20
OPERATIONAL RANGE .........................................................................................................................20
DC CHARACTERISTICS ........................................................................................................................21
AC CHARACTERISTICS ........................................................................................................................22
THERMAL PROTECTION........................................................................................................................22
THERMAL CHARACTERISTICS ...............................................................................................................23