DS2408 Maxim, DS2408 Datasheet - Page 30

• Manufacturer Part Number: DS2408
• Description: The DS2408 is an 8-channel, programmable I/O 1-Wire® chip
• Manufacturer: Maxim

Figure 20. DS2408 AS µC-OPERATED KEYBOARD SCANNER
Figure 21. DS2408 AS PARASITE-POWERED PUSH-BUTTON SENSOR
VCC
GND
1W
GND
1W
VCC
Parasite
0.1U
Power
VCC
3
4
5
POR Circuit
10U
3
4
5
DS2408
VCC
IO
GND
VCC
DS2408
GND
IO
DS1811
The DS1811 has
an internal pull-up
resistor of 5.5 kΩ
RSTZ
RSTZ
P0
P1
P2
P3
P4
P5
P6
P7
GND
VCC
P0
P1
P2
P3
P4
P5
P6
P7
VCC
RST
2
14
13
12
11
9
8
7
10
10
2
14
13
12
11
9
8
7
30 of 39
1
1 2 3 4 5 6 7 8 9 10
2
3
4
5
6
7
8
9
(Up to 4 x 4, 3 x 5 or 2 x 6)
10
To More Switch Rows
10kΩ
SWITCHES OR PUSH-BUTTONS
DS2408