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W83781D Datasheet(PDF) 10 Page - Winbond |
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W83781D Datasheet(HTML) 10 Page - Winbond |
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10 / 54 page  W83781D/W83781G Publication Release Date: April 14, 2005 - 6 - Revision 2.0 Continued PIN NAME PIN NO. TYPE DESCRIPTION -12VIN 31 AIN Ground-referred inverting op amp input. +12VIN 32 AIN 0V to 4.096V FSR Analog Inputs. +5VIN 33 AIN This pin is Analog Vcc and connects internal monitor channel IN3 with fixed scale. +3.3VIN 34 AIN 0V to 4.096V FSR Analog Inputs. VCOREB 35 AIN 0V to 4.096V FSR Analog Inputs. VCOREA 36 AIN 0V to 4.096V FSR Analog Inputs. VREF 37 AOUT Reference Voltage. VTIN3 38 AIN Thermistor 3 terminal input. VTIN2 39 AIN Thermistor 2 terminal input. VTIN1 40 AIN Thermistor 1 terminal input. VID0 41 INt Voltage Supply readouts from P6.This value is read in the VID/Fan Divisor Register. OVT# 42 OD12 Over temperature Shutdown Output. IRQ 43 OUT12t Interrupt Request. SMI# 44 OD12 System Management Interrupt (open drain). This output is enabled when Bit 1 in the Configuration Register (CR40) is set to 1. The default state is disabled. A2-A0 45-47 INt The three lowest order bits of the 16-bit ISA Address Bus. A0 corresponds to the lowest order bit. CS# 48 INt Chip Select input from an external decoder which decodes high order address bits on the ISA Address Bus. This is an active low input. # Indicates Active Low("Not") 7. FUNCTIONAL DESCRIPTION 7.1 General Description The W83781D/G provides 5 analog positive inputs, 2 analog negative input, 3 fan speed monitors or fan ON/OFF control, 3 thermistor voltage inputs, case open detection and beep function output when the monitor value exceed the set limit value. When start the monitor function on the chip, the watch dog machine monitor every function and store the value to registers. If the monitor value exceeds the limit value, the interrupt status will be set to 1. The W83781D/G provides two interface for microprocessor to read/write internal registers. The first interface use ISA Bus to access which the ports of low byte (bit2~bit0) are defined in the port 5h and 6h. The high byte 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: W83781D/G Index register port. Port 296h: Data port. |
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