GENERAL DESCRIPTION
The MON35W42 is an enhanced version of the
MON35W41 hardware status monitoring IC. The
MON35W42 can be used to monitor several
critical hardware parameters of the system,
including power supply voltages, fan speeds,
and temperatures, which are very important for
the stability and proper operation of high-end
computer systems. MON35W42 provides both
2
ISA and I C serial bus interface.
An 8-bit analog-to-digital converter (ADC) is
contained within the MON35W42.
The
MON35W42 can simultaneously monitor 9
analog voltage inputs, 2 fan tachometer inputs, 3
remote temperature and 1 case-open detection
signal. The remote temperature sensing can be
performed by thermistors, or 2N3904 NPN-type
®
transistors, or directly from Intel Deschutes
CPU thermal diode output. The MON35W42
provides: 4 PWM (pulse width modulation)
outputs for the fan speed control; beep tone
output for audio warning and nSMI, nOVT, and
nGPO signals for system protection events.
With application software such as the Intel
LDCM (LANDesk Client Managemet software,
the user can read all the monitored parameters
of system from time to time. And a pop-up
warning can also be activated when the
monitored item drifts out of the proper/preset
range. Also the user can set the upper and lower
limits (alarm thresholds) of these monitored
parameters and activate programmable and
maskable interrupts. An optional beep tone can
be used as a warning signal when the monitored
parameter is out of the preset range.
Additionally, 5 VID inputs are provided to read
®
the VID of CPU (i.e. Pentium II) if applicable.
This provides automatic correction of the Vcore
voltage. The MON35W42 uniquely provides an
optional feature: early stage (before BIOS is
loaded) beep warning. This is to detect if a fatal
condition is present --- Vcore or +3.3V voltage
fail, and the system can not boot up. There are
3 specific pins to provide selectable address
settings for applications using multiple devices
2
(up to 8 devices) wired through the I C interface.
®
2
SMSC [ SMSC CORPORATION ]
