TMC428_06 Datasheet, PDF(29/58 Page) List of Unclassifed Manufacturers – Intelligent Triple Stepper Motor Controller with Serial Peripheral Interfaces

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TMC428_06 Datasheet, PDF (29/58 Pages) List of Unclassifed Manufacturers – Intelligent Triple Stepper Motor Controller with Serial Peripheral Interfaces

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TMC428 DATASHEET (v. 2.02 / April 26th, 2006)

The CDGW (= Cover DataGram Waiting) status bit has to be checked before writing a new cover

datagram into this register, to be sure that no cover datagram is waiting to be processed. The CDGW

bit is set to 1 until the cover_datagram is sent. The CDGW status bit is also be used as a status bit for

the datagram_low_word and datagram_high_word (see section 9.1 on page 27). An example for

the cover datagram is given in Figure 9-2 on page 28. In that example 7 bits cover 7 bits of a 48 bit

datagram from bit number 39 to bit number 46. A cover datagram with length=0 forces sending an

unchanged datagram to the driver chain.

9.4 Unused Addresses (JDX={%0011, ..., %0111, %1001, ..., %1101})

There are unused addresses within the address range of the global parameter registers. Access to

these addresses has no effect. How ever, access should be avoided, because this address space may

be used for future devices.

9.5 power_down (JDX=%1000)

A write to the register address named power_down sets the TMC428 into the power down mode until

it detects a falling edge at the pin nSCS_C. During power down, all internal clocks are stopped, all

outputs remain stable, and all register contents are preserved.

9.6 Reference Switches l3 & r3 & l2 & r2 & l2 & r1 (JDX=%1110)

The current state of all reference switchesâ demultiplexed internally by the TMC428 if left and right

reference switches are used âcan be read from this read-only register. The bit named

continuous_update of the Stepper Motor Global Parameter Register (JDX=%1111) is important

for reading out of reference switches as explained below.

9.7 Stepper Motor Global Parameter Register (JDX=%1111)

This register holds different configuration bits for the stepper motor driver chain. The absolute address

(RRS & ADDRESS) of the stepper motor global parameter register is %01111110 = $7E (see Table

7-2, page 15, and Table 9-1, page 30). For the datagram configuration the number of stepper motor

drivers is important. It is represented by the parameter LSMD (Last Stepper Motor Driver). The

parameter LSMD has to be set to %00 for one stepper motor driver, %01 for two stepper motor

drivers, and %10 for three stepper motor drivers (see Table 9-2).

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