TMC246_06 datasheet(2/26 Pages) ETC2

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TMC246 / TMC246A DATA SHEET (V2.03 / Nov. 6th, 2006)

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

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 RSH ............................................................................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

TYPICAL POWER DISSIPATION AT HIGH LOAD / HIGH TEMPERATURE ........................................................23

TMC246 Datenblatt(PDF) 2 Page - List of Unclassifed Manufacturers

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