TMC249 / TMC249A DATA SHEET (V2.10 / 2011-Aug-10)
2
FEATURES ............................................................................................................................................. 1
PINNING.................................................................................................................................................. 5
PACKAGE CODES ................................................................................................................................... 5
SO28 DIMENSIONS ................................................................................................................................ 6
QFN32 DIMENSIONS.............................................................................................................................. 6
APPLICATION CIRCUIT / BLOCK DIAGRAM....................................................................................... 7
PIN FUNCTIONS...................................................................................................................................... 7
SELECTING POWER TRANSISTORS................................................................................................... 8
LIST OF RECOMMENDED TRANSISTORS .................................................................................................... 8
LAYOUT CONSIDERATIONS ................................................................................................................ 9
USING ADDITIONAL POWER DRIVERS............................................................................................. 10
CONTROL VIA THE SPI INTERFACE ................................................................................................. 11
SERIAL DATA WORD TRANSMITTED TO TMC249..................................................................................... 11
SERIAL DATA WORD TRANSMITTED FROM TMC249................................................................................ 11
TYPICAL MOTOR COIL CURRENT VALUES ................................................................................................ 12
BASE CURRENT CONTROL VIA INA AND INB IN SPI MODE....................................................................... 12
CONTROLLING THE POWER DOWN MODE VIA THE SPI INTERFACE ........................................................... 12
OPEN LOAD DETECTION........................................................................................................................ 13
STANDBY AND SHUTDOWN MODE .......................................................................................................... 13
POWER SAVING.................................................................................................................................... 13
STALL DETECTION STALLGUARD™................................................................................................ 14
USING THE SENSORLESS LOAD MEASUREMENT ...................................................................................... 14
IMPLEMENTING SENSORLESS STALL DETECTION..................................................................................... 14
PROTECTION FUNCTIONS................................................................................................................. 15
OVERCURRENT PROTECTION AND DIAGNOSIS ........................................................................................ 15
OVER TEMPERATURE PROTECTION AND DIAGNOSIS................................................................................ 15
OVERVOLTAGE PROTECTION AND ENN PIN BEHAVIOR............................................................................ 15
CHOPPER PRINCIPLE......................................................................................................................... 16
CHOPPER CYCLE / USING THE MIXED DECAY FEATURE ........................................................................... 16
ADAPTING THE SINE WAVE FOR SMOOTH MOTOR OPERATION.................................................................. 17
BLANK TIME......................................................................................................................................... 17
BLANK TIME SETTINGS .......................................................................................................................... 17
CLASSICAL NON-SPI CONTROL MODE (STAND ALONE MODE) .................................................. 18
PIN FUNCTIONS IN STAND ALONE MODE ................................................................................................. 18
INPUT SIGNALS FOR MICROSTEP CONTROL IN STAND ALONE MODE .......................................................... 18
UNIPOLAR OPERATION...................................................................................................................... 19
DIFFERENCES OF SHORT CIRCUIT BEHAVIOR IN UNIPOLAR OPERATION MODE........................................... 19
DIFFERENCES IN CHOPPER CYCLE IN UNIPOLAR OPERATION MODE.......................................................... 19
CALCULATION OF THE EXTERNAL COMPONENTS ....................................................................... 20
SENSE RESISTOR................................................................................................................................. 20
EXAMPLES FOR SENSE RESISTOR SETTINGS .......................................................................................... 20
HIGH SIDE OVERCURRENT DETECTION RESISTOR RSH ............................................................................ 20
MAKING THE CIRCUIT SHORT CIRCUIT PROOF ......................................................................................... 21
OSCILLATOR CAPACITOR...................................................................................................................... 22
TABLE OF OSCILLATOR FREQUENCIES ................................................................................................... 22
PULL-UP RESISTORS ON UNUSED INPUTS............................................................................................... 22
POWER SUPPLY SEQUENCING CONSIDERATIONS.................................................................................... 22
Copyright © 2005, TRINAMIC Motion Control GmbH & Co KG
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