W83782G Nuvoton Technology Corporation of America, W83782G Datasheet - Page 9

• Manufacturer Part Number: W83782G
• Description: IC MONITOR H/W 48-LQFP
• Manufacturer: Nuvoton Technology Corporation of America

Specifications of W83782G

• Output Type: I²C™, ISA
• Function: Hardware Monitor
• Topology: ADC, Fan Speed Counter, Register Bank
• Sensor Type: External
• Sensing Temperature: External Sensor
• Output Alarm: No
• Output Fan: Yes
• Voltage - Supply: 4.5 V ~ 5.5 V
• Operating Temperature: 0°C ~ 70°C
• Mounting Type: Surface Mount
• Package / Case: 48-LQFP
• Temperature Sensor Function: Temp Sensor
• Operating Temperature (min): -40C
• Operating Temperature (max): 120C
• Operating Supply Voltage (typ): 5V
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Pin Description, continued
6. FUNCTIONAL DESCRIPTION
6.1 General Description
The W83782D/G provides 7 analog positive inputs, 3 fan speed monitors, at most 4 sets for fan PWM
(Pulse Width Modulation) control, 3 thermal inputs from remote thermistors or 2N3904 transistors or
Pentium
the monitor value exceed the set limit value including voltage, temperature, or fan counter. When
starting the monitor unction on the chip, the watch dog machine monitors every function and stores the
value to registers. If the monitor value exceeds the limit value, the interrupt status will be set to 1.
6.2 Access Interface
The W83782D/G provides two interfaces for microprocessor to read/write internal registers.
6.2.1 ISA interface
The first interface uses ISA Bus to access which the ports of low byte (bit2~bit0) are defined in the port
5h and 6h. The high byte (from ISA address bus bit15~bit3) of these ports is decoded by Chip Select
(CS#), the general decoded address is set to port 295h and port 296h. These two ports are described
as following:
Port 295h: W83782D/G Index register port.
Port 296h: Data port.
The register structure is showed as the Figure 1.
ADRMSEL
SMI#
SA2-SA0
IA2, IA1, IA0
CS#
PIN NAME
TM
II (Deschutes) thermal diode outputs, case open detection and beep function output when
PIN NO.
45-47
43
44
48
TYPE
OD
IN
IN
IN
IN
12
t
t
t
t
Pin 45--47 mode selection.
0 = The 3 lowest order bits of ISA Address Bus.(Default,
internal pull-down 47K ohm)
1 = 7 bit I
System Management Interrupt (open drain). This output is
enabled when Bit 1 in the Configuration Register is set to 1.
The default state is disabled.
The three lowest order bits of the 16-bit ISA Address Bus.
A0 corresponds to the lowest order bit.
(Default, when ARDMSEL =0 or left open )
The hardware setting pin of 7 bit I
bit1 and bit0 at CR[48h]. (When ARDMSEL =1)
Chip Select input from an external decoder which decodes
high order address bits on the ISA Address Bus. This is an
active low input.
- 6 -
2
C
TM
address setting pin.(bit2 - bit0)
W83782D/W83782G
DESCRIPTION
2
C
TM
serial address bit2,