MON35W42 datasheet(2/60 Pages) SMSC

2 / 60 page

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

ISA and I

2C serial bus interface.

An 8-bit analog-to-digital converter (ADC) is

contained

within

the

MON35W42.

The

MON35W42

can

simultaneously

monitor

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

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

(up to 8 devices) wired through the I

2C interface.

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