W83627DHG Nuvoton Technology Corporation of America, W83627DHG Datasheet - Page 62

• Manufacturer Part Number: W83627DHG
• Description: IC I/O CONTROLLER 128-QFP
• Manufacturer: Nuvoton Technology Corporation of America

Specifications of W83627DHG

• Applications: PC's, PDA's
• Interface: LPC
• Voltage - Supply: 3.3V
• Package / Case: 128-XFQFN
• Mounting Type: Surface Mount
• Pin Count: 128
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

7.7
7.7.1
The SMI#/OVT# pin (pin 5) is a multi-function pin. It can be in SMI# mode or in OVT# mode by setting
Configuration Register CR[29h], bit 6 to one or zero, respectively. In SMI# mode, it can monitor
voltages, fan counts, or temperatures.
7.7.1.1.
The SMI# pin can create an interrupt if a voltage exceeds a specified high limit or falls below a specified
low limit. This interrupt must be reset by reading all the interrupt status registers, or subsequent events
do not generate interrupts. This mode is illustrated in the following figure.
7.7.1.2.
The SMI# pin can create an interrupt if a fan count crosses a specified fan limit (rises above it or falls
below it). This interrupt must be reset by reading all the interrupt status registers, or subsequent events
do not generate interrupts. This mode is illustrated in the figure above.
7.7.1.3.
The SMI# pin can create interrupts that depend on the temperatures measured by SYSTIN, CPUTIN,
and AUXTIN. These interrupts are divided into two parts, one for SYSTIN and the other for CPUTIN /
AUXTIN.
7.7.1.3.1. Temperature Sensor 1(SYSTIN) SMI# Interrupt
The SMI# pin has three interrupt modes with SYSTIN.
(1) Comparator Interrupt Mode
This mode is enabled by setting T
In this mode, the SMI# pin can create an interrupt as long as the current temperature exceeds T
(Over Temperature). This interrupt can be reset by reading all the interrupt status registers, or
subsequent events do not generate interrupts. If the interrupt is reset, the SMI# pin continues to
create interrupts until the temperature goes below T
Interrupt Detection
SMI# Interrupt Mode
SMI#
Low limit
High limit
Voltage SMI# Mode
Fan SMI# Mode
Temperature SMI# Mode
*Interrupt Reset when Interrupt Status Registers are read
*
*
HYST
*
(Temperature Hysteresis) to 127°C.
*
-50-
O
. This is illustrated in the figure below.
Fan Count limit
Publication Release Date: Aug, 22, 2007
SMI#
W83627DHG
*
*
Version 1.4
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