TMC248 DATASHEET (Rev. 1.01 / 2013-MAR-26)
3
TABLE OF CONTENTS
9.3
OVERVOLTAGE PROTECTION AND ENN PIN
BEHAVIOR
1
2
3
KEY CONCEPTS
4
26
27
28
30
1.1
1.2
ADVANCED FEATURES
CONTROL INTERFACES
5
5
10
11
12
MICROSTEP RESOLUTION
MOSFET EXAMPLES
PIN ASSIGNMENTS
6
LAYOUT CONSIDERATIONS
2.1
2.2
PACKAGE OUTLINE
SIGNAL DESCRIPTIONS
6
6
12.1
12.2
12.3
12.4
GROUNDING
FILTERING CAPACITORS
PULL-UP RESISTORS ON UNUSED INPUTS 31
POWER SUPPLY SEQUENCING
CONSIDERATIONS
LAYOUT EXAMPLE
30
30
STALLGUARD - STALL DETECTION
AND REFERENCE SEARCH
7
3.1
3.2
STALLGUARD MEASUREMENT
IMPLEMENTING SENSORLESS STALL DETECTION
7
31
32
12.5
9
13
14
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS
33
34
4
SPI INTERFACE
10
4.1
4.2
4.3
BUS SIGNALS
MOTOR COIL CURRENT SETTING VIA SPI 11
BASE CURRENT CONTROL MODE VIA INA /
INB IN SPI MODE
10
14.1
14.2
14.3
14.4
OPERATIONAL RANGE
DC SPECIFICATIONS
AC SPECIFICATIONS
THERMAL PROTECTION
34
34
36
36
11
4.4
CONTROLLING POWER DOWN VIA THE SPI
INTERFACE
13
13
13
13
14
15
PACKAGE MECHANICAL DATA
37
4.5
4.6
4.7
4.8
4.9
OPEN LOAD DETECTION
STANDBY AND SHUTDOWN MODE
POWER SAVING
BUS TIMING
USING THE SPI INTERFACE WITH ONE OR
MULTIPLE DEVICES
15.1
15.2
DIMENSIONAL DRAWINGS
PACKAGE CODE
37
37
16
17
18
19
20
DISCLAIMER
38
38
39
40
40
ESD SENSITIVE DEVICE
TABLE OF FIGURES
REVISION HISTORY
REFERENCES
14
14
4.10
SPI FILTER
5
CLASSICAL NON-SPI CONTROL MODE
(STANDALONE MODE)
15
5.1
5.2
PIN FUNCTIONS IN STANDALONE MODE
INPUT SIGNALS FOR MICROSTEP CONTROL IN
15
STANDALONE MODE
15
6
7
CURRENT SETTING
16
6.1
6.2
SENSE RESISTOR FOR CURRENT SETTING 16
RESISTOR RSH FOR HIGH SIDE OVERCURRENT
DETECTION
16
CHOPPER OPERATION
18
7.1
7.2
7.3
MIXED DECAY MODE
CHOPPER FREQUENCY
VOLTAGE PWM MODE FOR LOW NOISE
18
19
CHOPPER
20
7.4
7.5
ADAPTING THE SINE WAVE FOR SMOOTH
MOTOR OPERATION
BLANK TIME
22
23
8
9
SLOPE CONTROL
24
25
PROTECTION FUNCTIONS
9.1
9.2
OVERCURRENT PROTECTION AND DIAGNOSTIC
25
OVER TEMPERATURE PROTECTION AND
DIAGNOSTIC
25
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