MAX1608 Datasheet, PDF (14/16 Pages) Maxim Integrated Products – Octal SMBus-to-Parallel I/O Expanders

Octal SMBus-to-Parallel I/O Expanders
+5V
+3.3V TO +28V
100k
10k 10k 10k
V+
MAX1609
0.1µF
IRF7406
P
75k*
1M
ALERT
IO0
TO/FROM
HOST
SMBDATA
SMBCLK
SMBSUS
ADD0
IRF7406
P
ADD1 _GND IO7
NOTE: OTHER OUTPUTS CAN BE CONFIGURED SIMILARLY.
*75kΩ RESISTOR FOR VOLTAGES GREATER THAN +12V.
LOAD
Figure 7. Battery Switch with Back-to-Back MOSFETs
+5V
10k
10k
TO/FROM
HOST
V+
MAX1608
MAX1609
ALERT
IO0
SMBDATA
IO1
SMBCLK
IO2
SMBSUS
ADD0
ADD1 _GND
IO7
1k
1k
1k
0.1µF
Figure 8. LED Driver
Mechanical Switch Monitor
The MAX1608/MAX1609’s ability to perform IO_ logic-
state readback makes them suitable for checking sys-
tem status. They can be used as an “open-lid indicator,”
sensing a change in the IO_ and sending an interrupt
to the master to indicate a change in status (Figure 9).
The same can be done to detect a chassis intrusion, a
reset switch, or a card insertion.
Simple High-Voltage Switch
For applications requiring a higher voltage, use a sim-
ple resistive divider to protect the gate from breakdown
yet allow the MOSFETs to handle higher voltage appli-
cations (Figure 10).
___________________Chip Information
TRANSISTOR COUNT: 5762
14 ______________________________________________________________________________________