Datasheet
TMC429 DATASHEET (v. 1.07 / 2012-AUG-01) 9
Copyright © 2010-2012, TRINAMIC Motion Control GmbH & Co. KG
Pin
[TMC428 name]
SSOP16
SOP24
[TMC428]
SOP24
[TMC429]
QFN32
In/Out
Description
Reset
-
-
-
-
-
internal power-on reset
CLK
5
7
7
5
I
clock input
nSCS_C
6
9
9
7
I
low active SPI chip select input driven from µC
SCK_C
7
10
10
8
I
serial data clock input driven from µC
SDI_C
8
11
11
10
I
serial data input driven from µC
[SDO_C / nINT]
nINT_SDO_C
9
14
14
14
O
serial data output to µC input / multiplexed
nINTERRUPT output if communication with µC is
idle (resp. nSCS_C = 1)
Important Note: SDO_C will never be high
impedance, but this function can added with a
single gate 74HCT1G125 (pls. refer Figure 7-2,
page12); the TMC429 is equipped with an
additional pin named SDOZ_C that becomes high
impedance when nSCS_C='1';
[nSCS_S]
nSCS_S_S2
12
17
17
18
O
SPI chip select signal to stepper motor driving
chain /
step output S2 (for motor 2) in step direction mode
of TMC429
[nSCS2]
nSCS2_S3
-
18
18
19
O
SPI chip select signal (SOP24 package only) /
step output S3 (for motor 3) in step direction mode
of TMC429
[nSCS3]
nSCS3_D3
-
19
19
20
O
SPI chip select signal (SOP24 package only) /
direction output D3 (for motor 3) in step direction
mode of TMC429
[SCK_S]
SCK_S_D1
11
16
16
17
O
serial data clock output to SPI stepper motor driver
chain
direction output D1 (for motor 1) in step direction
mode of TMC429
[SDO_S]
SDO_S_S1
10
15
15
15
O
serial data output to SPI stepper motor driver chain;
step output S1 (for motor 1) in step direction mode
of TMC429
SDI_S_D2
[SDI_S]
16
23
23
27
I
O
serial data input from SPI stepper motor driver
chain
Note: pull-up/-down resistor at SDI_S avoids high
impedance; SDI_S input is the power-on default;
direction output D2 (for motor 2) in step direction
mode of TMC429
REF1
1
2
2
31
I
reference switch input 1; no internal pull-up R
REF2
2
3
3
1
I
reference switch input 2; no internal pull-up R
REF3
3
4
4
2
I
reference switch input 3; no internal pull-up R
V5
13
5, 20
5, 20
3, 21
+5V supply / +3.3V supply
V33
14
21
21
22
470nF ceramic capacitor pin / +3.3V supply
GND
15
8, 22
8, 22
6, 23, 25
ground
TEST
4
6
6
4
I
must be connected to GND as close as possible to
the chip
n.c.
-
-
-
9, 11, 16,
24,26, 32
-
not connected (n.c.) pins; SOP24 package of the
TMC428 has n.c. pins 1, 12, 13, 24
[n.c.]
POSCMP
-
n.c.
1
30
n.c. / O
TMC428 in SOP24 the pin 1 is not connected (n.c.);
TMC429 position compare output for SPO24 and
QFN32; output for pos_comp function of TMC429
SDOZ_C
-
n.c.
12
12
O / Z
SDOZ_C becomes high impedance (Z) when
nSCS_C='1'; the nINT signal is not mapped to
SDOZ_C pin; the pin nINT_SDO_C can be
configured with TMC429 register to give the nINT
signal directly without multiplexing
REFR1
-
n.c.
24
28
I
reference switch right 1 input; only available for
TMC429 in SOP24 package and QFN32 package;
internal pull-up R
REFR2
-
n.c.
13
13
I
reference switch right 2 input; only available for
TMC429 in SOP24 package and QFN32 package;
internal pull-up R
REFR3
-
-
-
29
I
reference switch right 3 input; only available for
TMC429 in QFN32 package; internal pull-up R
Table 5-1: TMC429 pinning (TMC428 SOP24: pin 1 n.c. / TMC429 SOP24: pin 1 output)