TMC249 / TMC249A DATA SHEET (V2.09 / 2009-Jul-30)
18
Classical non-SPI control mode (stand alone mode)
The driver can be controlled by analog current control signals and digital phase signals. To enable this
mode, tie pin SPE to GND. In this mode, the SPI interface is disabled and the SPI input pins have
alternate functions. The internal DACs are forced to “1111”.
Pin functions in stand alone mode
Pin
Stand alone Function in stand alone mode
mode name
SPE
ANN
SCK
SDI
(GND)
MDAN
MDBN
PHA
Tie to GND to enable stand alone mode
Enable mixed decay for bridge A (low = enable)
Enable mixed decay for bridge B (low = enable)
Polarity bridge A (low = current flow from output OA1 to OA2)
Polarity bridge B (low = current flow from output OB1 to OB2)
CSN
SDO
PHB
ERR
Error output (high = overcurrent on any bridge, or over temperature). In this
mode, the pin is never tri-stated.
ENN
ENN
Standby mode (high active), high causes a low power mode of the device.
Setting this pin high also resets all error conditions.
INA,
INB
INA,
INB
Current control for bridge A, resp. bridge B. Refer to AGND. The sense
resistor trip voltage is 0.34V when the input voltage is 2.0V. Maximum input
voltage is 3.0V.
Input signals for microstep control in stand alone mode
Attention: When transferring these waves to SPI operation, please remark, that the mixed decay bits
are inverted when compared to stand alone mode.
INA
INB
90°
180°
270°
360°
PHA
(SDI)
PHB
(CSN)
MDAN
(ANN)
MDBN
(SCK)
Use dotted line to improve performance
at medium velocities
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TRINAMIC [ TRINAMIC MOTION CONTROL GMBH & CO. KG. ]
