W83627DHG Datasheet, PDF (46/268 Pages) Winbond – WINBOND LPC I/O

W83627DHG
7.3.3.3. Monitor Temperature from Thermal Diode (Current Mode)
The W83627DHG can also sense the diode temperature through Current Mode and the circuit is shown
in the following figure.
D+
Thermal
Diode
D-
W83627DHG
C=2200pF
(SYSTIN)
CPUTIN
(AUXTIN)
CPUD-(AGND)
The pin of processor D- is connected to CPUD-(pin 105) and the pin D+ is connected to temperature
sensor pin in the W83627DHG. A bypass capacitor C=2200pF should be added to filter the high
frequency noise.
7.4 SST Command Summary
The W83627DHG is equipped with a built-in voltage and temperature sensor which uses the
Simple Serial Transport (SST) interface. The sensor provides a means for an analog signal to travel
over a digital bus enabling remote voltage and temperature sensing in areas previously not monitored
in the PC.
SST is a self-clocked, one-wire bus for data transfer. The bus requires no additional control lines.
In addition, SST also includes variable data transfer rate established with every message. Therefore, it
is comparatively flexible. The W83627DHG has a programmable SST address defined at Logical
Device C CR[F1h]. The default address is 0x48h which is within the range of 0x48h-0x4ah defined in
the SST specification.
7.4.1 Command Summary
The W83627DHG supports SST commands as shown in the following table:
COMMAND
GetIntTemp()
GetExtTemp()
GetAllTemps()
GetVolt12V()
GetVolt5V()
GetVolt3p3V()
DESCRIPTION
Returns the 2-byte temperature data values for pin SYSTIN(Pin 104)
Returns the 2-byte temperature data values for pin CPUTIN(Pin 103)
Returns the 4-byte temperature data values for both SYSTIN and CPUTIN
Returns the 2-byte voltage data values for pin VIN0 (Pin 99). This pin should
be connected to +12V power through scaling resistors Refer to 7.4.2.2
Returns the 2-byte voltage data values for pin VIN1 (Pin 98). This pin should
be connected to +5V power through scaling resistors Refer to 7.4.2.2
Returns the 2-byte voltage data values for pin 3VCC (Pin 12, 28, 48).This
pin should be connected to +3.3V power directly Refer to 7.4.2.2
Publication Release Date: Aug, 22, 2007
-34-
Version 1.4