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參數(shù)資料
| 型號： | TMC428 |
| 廠商： | Electronic Theatre Controls, Inc. |
| 英文描述： | Intelligent Triple Stepper Motor Controller with Serial Peripheral Interfaces |
| 中文描述： | 三步進電機智能控制器的串行外圍接口 |
| 文件頁數(shù)： | 13/50頁 |
| 文件大小： | 378K |
| 代理商： | TMC428 |
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TMC428 DATA SHEET (V. 1.00 / February 12, 2001)
13
Copyright 2000, TRINAMIC Microchips GmbH
M I C R O C H I P S
13
Address Space Partitions
The address space is partitioned in different ranges. Each of the up to three stepper motors has a set of
registers individually assigned to it, arranged within a contiguous address space. An additional set of
registers within the address space holds some global parameters common for all stepper motors. One
dedicated global parameter register is essential for the configuration of the serial four wire stepper motor
driver interface. One half of the on-chip RAM address space holds the configuration parameters for the
stepper motor driver chain. The other half of the on-chip RAM address space is provided to store a micro
step table if required. The first seven datagram bits (
sdi_c_bit#31
and
sdi_c_bit#30
...
sdi_c_bit#25
,
respectively
RRS
and
ADDRESS
) address the whole address space of the TMC428.
address ranges (incl. RRS)
%000 0000
. . .
%001 0000
. . .
%010 0000
. . .
%011 0000
. . .
assignment
%000 1111
%001 1111
%010 1111
%011 1110
%011 1111
%101 1111
%111 1111
16 registers for stepper motor #1
16 registers for stepper motor #2
16 registers for stepper motor #3
15 common registers
1 global parameter register
32 addresses of 2x6 bit for driver chain configuration
32 addresses of 2x6 bit for micro step table
registers
with up to
24 bits
%100 0000
%110 0000
. . .
. . .
RAM
128x6 bit
Table 4 - TMC428 address space partitions
The stepper motors are controlled directly by writing motion parameters into associated registers. Only
one register write access is necessary to change a target motion parameter. E.g. to change the target
position of one stepper motor, a micro controller has to send only one 32 bit datagram to the TMC428.
The same is true for changing a target velocity. Some parameters are composed as a single data word at a
single address. Those parameters– initialized once and unchanged during operation –have to be changed
commonly. Access to on-chip RAM addresses takes always place to two successive RAM addresses. So,
always two data words are modified with each write access to the on-chip RAM. Once initialized after
power-up, the content of the RAM is usually left unchanged.
Read and Write
Read and write access is selected by the RW bit (sdi_c_bit#24) of the datagram send from the μC to the
TMC428. The on-chip configuration RAM and the registers are writeable with read-back option. Some
addresses are read-only. Write access (
RW
=0) to some of those read-only registers triggers initialization.
Register Set
The register address mapping is given in Table 5 on page 14. These registers are initialized internally
during power-up. During power-up initialization, the TMC428 sends no datagrams to the stepper motor
driver chain.
Please note
: Before writing target parameters to the register set, the RAM has to be
initialized first.
RAM Area
The RAM address mapping is given in Table 12 page 30. The on-chip RAM is
NOT
initialized internally
during power-up. The RAM has to be initialized by the micro controller first after power-up.
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