Datasheet

14 TMC223 DATASHEET (V. 1.00 / May 3rd, 2007)

5.1.10 Motor Shutdown Management

The TMC223 is set into motor shutdown mode as soon as one of the following condition occurs:

• The chip temperature rises above the thermal shutdown threshold T

tsd

. See 5.1.12 Temperature

Management on Page 16

• The battery voltage drops below UV2 See 5.1.13 Battery Voltage Management on Page 17.

• An electrical problem occurred, e.g. short circuit, open circuit, etc. In case of such an problem flag

<ElDef> is set to one.

• Charge pump failure, indicated by <CPFail> flag set to one.

During motor shutdown the following actions are performed by the main controller:

• H-bridges are set into high impedance mode

• The target position register TagPos is loaded with the contents of the actual position register

ActPos.

The two-wire-serial-interface remains active during motor shutdown. To leave the motor shutdown

state the following conditions must be true:

• Conditions which led to a motor shutdown are not active anymore

• A GetFullStatus1 command is performed via serial interface.

Leaving the motor shutdown state initiates the following

• H-bridges in Ihold mode

• Clock for the motor control digital circuitry is enabled

• The charge pump is active again

Now the TMC223 is ready to execute any positioning command.

IMPORTANT NOTE:

First, a GetFullStatus1 command has to be executed after power-on to activate the TMC223.