TMC249 DATA SHEET (V1.01 / Sep. 11th, 2003)

TMC 249 DATA SHEET

High Current Microstep Stepper Motor Driver

with sensorless stall detection, protection /

diagnosis and SPI Interface

TRINAMIC

Microchips GmbH

Deelbögenkamp 4C
D 22297 Hamburg
GERMANY
T +49 - (0) 40 - 51 48 06 - 0
F +49 - (0) 40 - 51 48 06 - 60
WWW.TRINAMIC.COM
INFO@TRINAMIC.COM

Features

The TMC249 is a dual full bridge driver IC for bipolar stepper motor control applications. The TMC249
is realized in a HVCMOS technology and directly drives eight external Low-RDS-ON high efficiency
MOSFETs. It supports more than 4000mA coil current. With additional drivers, motor current and
voltage can be increased. The driver transistors can be chosen depending on output current or
environment temperature. The integrated unique sensorless stall detection (pat. fi.) stallGuardTM
makes it a good choice for applications, where a reference point is needed, but where a switch is not
desired. Its ability to predict an overload makes the TMC249 an optimum choice for drives, where a
high reliability is desired. Internal DACs allow microstepping as well as smart current control. The
device can be controlled by a serial interface (SPITM

) or by analog / digital input signals. Short circuit,

temperature, undervoltage and overvoltage protection are integrated.

· More than 4000mA using 8 external MOS transistors
· Sensorless stall detection stallGuard and load measurement integrated
· Control via SPI with easy-to-use 12 bit protocol or external analog / digital signals
· Short circuit and overtemperature protection integrated
· Overvoltage protection integrated
· Status flags for overcurrent, open load, over temperature, temperature pre-warning, undervoltage
· Integrated 4 bit DACs allow up to 16 times microstepping via SPI, any resolution via analog

control

· Mixed decay feature for smooth motor operation
· Slope control user programmable to reduce electromagnetic emissions
· Chopper frequency programmable via a single capacitor or external clock
· Current control allows cool motor and driver operation
· 7V to 30V motor supply voltage
· External drivers can be added for higher motor voltages and higher currents (e.g. 75V, 10A)
· Only 4 external PMOS transistors required for unipolar operation
· 3.3V or 5V operation for digital part
· Low power dissipation via low RDS-ON power stage
· Standby and shutdown mode available

TMC249 DATA SHEET (V1.01 / Sep. 11th, 2003)

Life support policy

TRINAMIC Microchips GmbH does not authorize
or warrant any of its products for use in life
support systems, without the specific written
consent of TRINAMIC Microchips GmbH.

Life support systems are equipment intended to
support or sustain life, and whose failure to
perform, when properly used in accordance with
instructions provided, can be reasonably
expected to result in personal injury or death.

© TRINAMIC Microchips GmbH 2003

Information given in this data sheet is believed to
be accurate and reliable. However no
responsibility is assumed for the consequences
of its use nor for any infringement of patents or
other rights of third parties, which may result form
its use.

Specifications subject to change without notice.

TMC249 DATA SHEET (V1.01 / Sep. 11th, 2003)

Pinning

TMC249 / 239A

SO28

SDO

SDI

LA2

HA1

INB

HA2

SRA

LA1

GNDA

ANN

SLP

INA

BL2

SCK

LB1

SRB

CSN

HB1

BL1

OSC

LB2

GND

VCC

HB2

ENN

SPE

Package codes

Package Temperature

range

Code/marking

SO28 automotive

TMC249-SA

LPCC28
6*6mm

automotive
please request

TMC249-LA

*) ICs are not yet tested according to automotive standards, but are usable within the complete
temperature range.

SO28 Dimensions

REF MIN. MAX.
A 10 10.65
B 17.7 18.1
C 7.4 7.6
D 1.4
E 2.65
F 0.25
G 0.1 0.3
H 0.36 0.49
I 0.4 1.1
K 1.27

All dimensions are in mm.

TMC249 DATA SHEET (V1.01 / Sep. 11th, 2003)

Application Circuit / Block Diagram

Coil A

Coil B

100µF

220nF

TMC249

HA1

HA2

LA2

LA1

LB1

LB2

HB2

HB1

SRB

SRA

DAC

INA

INB

VREF

REFSEL

-
CTRL

ANN

SPE

ent Controll

Gate Dr

iver

Curr

ent Contr

lled

Dri

v
e
r
s

SLP

PWM-CTR

OSC

ont

r
o

l &

Diagnos

lle

Control

SPI

Interfa

c
e

REFSEL

GND

AGND

Under-

voltage

Tem-

perature

OSC

VCC

1nF

100nF

SCK

SDI

SDO

CSN

BL2

BL1

[MDBN]

[PHA]

[ERR]

[PHB]

stand alone mode

[MDAN]

[...]: function in stand alone mode

ENN

VCC/2

Loa

mes

re-

Pin Functions

Pin Function

Motor supply voltage

Short to GND detection comparator
connect to VS if not used

VCC

3.0-5.5V supply voltage for analog
and logic circuits

GND

Digital / Power ground

AGND

Analog ground (Reference for SRA,
SRB, OSC, SLP, INA, INB)

OSC

Oscillator capacitor or external clock
input for chopper

INA

Analog current control phase A

INB

Analog current control input phase B

SCK

Clock input of serial interface

SDO

Data output of serial interface (tri-
state)

SDI

Data input of serial interface

CSN

Chip select input of serial interface

ENN

Device enable (low active), and
overvoltage shutdown input

SPE

Enable SPI mode (high active). Tie to
GND for non-SPI applications

ANN

Enable analog current control via
INA and INB (low active)

SLP

Slope control resistor. Tie to GND for
fastest slope

BL1, BL2

Digital blank time select

SRA, SRB Bridge A/B current sense resistor input

HA1, HA2,
HB1, HB2

Outputs for high side P-channel
transistors

LA1, LA2,
LB1, LB2

Outputs for low side N-channel
transistors

TMC249 DATA SHEET (V1.01 / Sep. 11th, 2003)

Selecting Power Transistors

Selection of power transistors for the TMC249 depends on required current, voltage and thermal
conditions. Driving transistors directly with the TMC249 is only limited by the gate capacity of these
transistors. If the total gate charge is too high, slope time increases and leads to a higher switching
power dissipation. Typical applications can reach a current in excess of 4A, while the maximum
voltage is limited to 30V. A total gate charge of below 10nC per transistor is recommended. The table
below shows a choice of transistors which can be driven directly by the TMC249. The maximum
application current mainly is a function of cooling and environment temperature. The given values are
more conservative. Peak currents typically can be higher by a factor of 1.5 for a limited time.

List of recommended transistors

Manufacturer
and type

Package
(#Trans)

Volts N-type
Volts P-type

RDS

[Ohm]

Total gate
charge [nC]

Typical maximum
application current

Siliconix
SI 7501DN

PPack
(1N,1P)

30V
30V

0.03
0.05

5.0
8.0

4000mA

Siliconix
SI 4539ADY

SO8
(1N,1P)

30V
30V

0.04
0.06

7.5
9.0

3500mA

Siliconix
SI 5504

1206-8
(1N,1P)

30V
30V

0.09
0.17

5.0
5.5

2000mA

IRF 9952

SO8
(1N,1P)

30V
30V

0.10
0.25

6.9
6.1

2500mA

IRF 7509

Micro8
(1N,1P)

30V
30V

0.11
0.20

7.8
7.5

2000mA

IRF 5851

TSOP6
(1N,1P)

20V
20V

0.09
0.14

6.0
6.0

1500mA

Siliconix
SI 1901

SOT363-6
(2P)

30V 0.48

0.8 200mA

unipolar

Fairchild Semi
FDS 8333C

SO8
(1N,1P)

30V
30V

0.08
0.13

4.7
4.1

3000mA

Layout Considerations

For optimal operation of the circuit a careful board layout is important, because of the combination of
high current chopper operation coupled with high accuracy threshold comparators. Please pay special
attention to massive grounding. Depending on the required motor current, either a single massive
ground plane or a ground plane plus star connection of the power traces may be used. The schematic
shows how the high current paths can be routed separately, so that the chopper current does not flow
through the system's GND-plane. Tie the TMC249's AGND and GND to the GND plane. Additionally,
use enough filtering capacitors located near to the board's power supply input and small ceramic
capacitors near to the power supply connections of the TMC249. Use low inductance sense resistors,
or add a ceramic capacitor in parallel to each resistor to avoid high voltage spikes. In some
applications it may become necessary to
introduce additional RC-filtering into the VT and
SRA / SRB line, as shown in the schematic, to
prevent spikes from triggering the short circuit
protection or the chopper comparator. If you
want to take advantage of the thermal
protection and diagnosis, ensure, that the
power transistors are very close to the
package, and that there is a good thermal
contact between the TMC249 and the external
transistors. Please be aware, that long or thin
traces to the sense resistors may add
substantial resistance and thus reduce output
current. The same is valid for the high side
shunt resistor.

+VM

GND

GND-
Plane

Bridge A

Bridge B

100R

4.7nF

optional filter

TMC249/

TMC239A

100R

3.3 -
10nF

SRA

SRB

optional filter

AGND

GND

100nF

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ÐÐ»ÐµÐºÑ‚Ñ€Ð¾Ð½Ð½Ñ‹Ð¹ ÐºÐ¾Ð¼Ð¿Ð¾Ð½ÐµÐ½Ñ‚: TMC249-SA