EMC6D103-CK SMSC [SMSC Corporation], EMC6D103-CK Datasheet - Page 30

• Manufacturer Part Number: EMC6D103-CK
• Description: FAN CONTROL DEVICE WITH HIGH FREQUENCY PWM
• Manufacturer: SMSC [SMSC Corporation]

Revision 0.4 (04-04-05)
6.8
6.9
6.9.1
6.9.2
Min Value (Corresponds
to A/D output 00000000)
Max Value (Corresponds
to A/D output 11111111)
INPUT VOLTAGE
are stored in the Reading registers and compared with the Limit registers. The status bits in the
Interrupt Status Register 1 and 2 are set if the measured values violate the programmed limits.
The Vccp voltage input measures the processor voltage, which will lie in the range of 0V to 3.0V.
Table 6.5, "Min/Max ADC Conversion Table"
the min and max output codes of the A/D converter. For a complete list of the ADC conversions see
Appendix A, "ADC Voltage Conversion," on page
VID0-VID4 digital inputs are used to store processor Voltage ID codes (for processor operating voltage)
in the VID0-4 register (43h). These VIDs can be read out by the management system using the SMBus
interface.
Temperatures are measured internally by bandgap temperature sensor and externally using two sets
of diode sensor pins (for measuring two external temperatures). See subsections below.
Note: The temperature sensing circuitry for the two remote diode sensors is calibrated for a 3904
Internal Temperature Measurement
Internal temperature can be measured by bandgap temperature sensor. The measurement is
converted into digital format by internal ADC. This data is converted in two’s complement format since
both negative and positive temperature can be measured. This value is stored in Internal Temperature
Reading register (26h) and compared to the Temperature Limit registers (50h – 51h). If this value
violates the programmed limits in the Internal High Temperature Limit register (51h) or the Internal Low
Temperature Limit register (50h) the corresponding status bit in Interrupt Status Register 1 is set.
If auto fan option is selected, the hardware will adjust the operation of the fans accordingly. See the
section titled
External Temperature Measurement
The Hardware Monitor Block also provides a way to measure two external temperatures using diode
sensor pins (Remote x+ and Remote x-). The value is stored in the register (25h) for Remote1+ and
Remote1- pins. The value is stored in the Remote Temperature Reading register (27h) for Remote2+
and Remote2- pins. If these values violate the programmed limits in the associated limit registers, then
the corresponding Remote Diode 1 (D1) or Remote Diode 2 (D2) status bits will be set in the Interrupt
Status Register 1.
If auto fan option is selected, the hardware will adjust the operation of the fans accordingly. See
Fan Control Operating Mode on page
There are Remote Diode (1 or 2) Fault status bits in Interrupt Status Register 2 (42h), which, when
one, indicate a short or open-circuit on remote thermal diode inputs (Remote x+ and Remote x-).
Voltage ID
Temperature Measurement
type diode.
Auto Fan Control Operating Mode on page
<0.062
>15.938
+12V
Table 6.5 Min/Max ADC Conversion Table
IN
Fan Control Device with High Frequency PWM Support and Hardware Monitoring Features
<0.026
>6.640
+5V
IN
DATASHEET
35.
<0.017
>4.383
V
CC
30
/3.3V
shows the values of the analog inputs that correspond to
IN
86.
<0.013
>3.320
+2.5V
35.
IN
<0.009
>2.391
+1.8V
IN
<0.008
>1.992
+1.5V
SMSC EMC6D103
IN
>2.988
<0.012
Datasheet
+V
CCP
Auto