NCT6627UD Nuvoton Technology Corporation of America, NCT6627UD Datasheet - Page 45

• Manufacturer Part Number: NCT6627UD
• Manufacturer: Nuvoton Technology Corporation of America

Specifications of NCT6627UD

• Lead Free Status / Rohs Status: Supplier Unconfirmed

The W83627UHG also can measure diode temperature by current mode and the circuit is shown in the following
figure.
The pin of processor D- is connected to AGND (pin 105) and the pin D+ is connected to temperature sensor pin in
W83627UHG. A bypass capacitor C=2200pF should be added to filter the high frequency noise. The configuration
registers to select a thermal diode temperature sensor and the measurement method are found at Bank 0, Index
59h, 5Dh, and 5Eh.
7.4
The W83627UHG can act as an SST peripheral or slave and output the results of the Analog to Digital Converter
onto the SST bus. SST is a new, popular standard to communicate temperature and voltage information from
around the PC motherboard to report on the status of the system and control cooling fans and other safety
mechanisms.
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 W83627UHG 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.
Since the same, integrated Analog to Digital Converter is used, all the features and restrictions of use remain the
same. The reference voltage is integrated and fixed with the 8-bit ADC, yielding a maximum voltage on each of
2.048V and an LSB of 8mV. As discussed in the previous section 7.3, voltage scaling using resistive dividers may
be necessary to keep external voltages within the maximum input voltage range. The power supply pins have
integrated resistive dividers.
7.3.3.3.
SST Command Summary
Monitor Temperature from Thermal Diode (Current Mode)
Thermal
Diode
Figure 7-7 Monitoring Temperature from Thermal Diode
D+
D-
C= 2200pF
-36-
W83627UHG/NCT6627UD
AGND
W83627UHG
CPUTIN
(SYSTIN)
Publication Release Date: October 26, 2010
Revision 1.7