TMC423_1 TRINAMIC [TRINAMIC Motion Control GmbH & Co. KG.], TMC423_1 Datasheet - Page 19

• Manufacturer Part Number: TMC423_1
• Description: Serial Triple Incremental Encoder Interface
• Manufacturer: TRINAMIC [TRINAMIC Motion Control GmbH & Co. KG.]

TMC423 Data Sheet – (V1.13 / June 20
9 LED and Switch Matrix
The TMC423 can be used to drive a LED matrix or to get information from a switch matrix, whether
the switches are on or off. LEDs or switches are only active when the corresponding column is
selected by setting it to zero. The switch frequency of the column pins is fixed to 500 Hz at a clock
frequency of 16MHz. The LEDs are driven with a maximum current of 20mA.
The following Table 14: TMC423 LED Matrix Pins shows how the LED Matrix Write register is mapped
to the corresponding TMC423 pins to drive the LEDs.
TMC423 Pin: COLUMN_PIN [3:0]
For correct external connection of the matrix please refer to the following Figure 13: Connection to
the matrix. If distortions causes by long PCB traces are to expect, then filter capacitors C
have to be added.
Copyright © 2004 TRINAMIC Motion Control GmbH & Co. KG
Bit 3
0
1
1
1
Bit 2
1
0
1
1
TMC423
Bit 1
1
1
0
1
10k
5V
180
Figure 13: Connection to the matrix
7407
Bit 0
Table 14: TMC423 LED Matrix Pins
1
1
1
0
th
, 2007)
C
(opt.)
filter
23
17
11
5
22
16
10
TMC423 Pin: LED_ROW_PIN [5:0]
4
LED_Matrix_Write [23:0]
21
15
9
3
20
14
8
2
19
13
7
1
filter
of 100pF
18
12
19/22
6
0