MAX1661-MAX1663 Datasheet, PDF (13/16 Pages) Maxim Integrated Products – Serial-to-Parallel/Parallel-to-Serial Converters and Load-Switch Controllers with SMBus Interface

Serial-to-Parallel/Parallel-to-Serial Converters and
Load-Switch Controllers with SMBus Interface
Mechanical Switch Monitor
The ability of the MAX1661/MAX1662/MAX1663 to read
back the logic state of the I/Os makes them suitable for
checking system status. They can be used as an
“open-lid indicator”, sensing a change in the I/O 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.
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).
+5V
10k 10k 10k
TO/FROM
HOST
100Ω*
0.1µF
V_CC
MAX1661
MAX1662
ALERT MAX1663 I/O1
SMBDATA
I/O2
SMBCLK
I/O3
SMBSUS
ADD
GND
100k
100k
100k
Figure 9. Open-Lid Detect or Chassis Intrusion Detector
*OPTIONAL
+5V
10k 10k 10k
TO/FROM
HOST
*OPTIONAL
I/O2 AND I/O3 CAN BE CONFIGURED SIMILIARLY.
Figure 10. Simple High-Voltage Switch
100Ω*
V_CC
MAX1662
MAX1663
ALERT
I/O1
SMBCLK
I/O2
SMBDATA
I/O3
SMBSUS
ADD _GND
200k
0.1µF
200k
V_IN = 10V TO 28V
0.01µF*
IRF7406
LOAD
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