Intel Intel NetStructure Single Board Computer, MPCBL0010 - page 111

MPCBL0010 SBC—Addressing
Intel NetStructure® MPCBL0010 Single Board Computer
Technical Product Specification October 2006
110 Order Number: 304120
Address 21h returns ADC1; address 22h returns ADC2
ADC1 measures the current on the main 48V input power
ADC1 = (256/4.096)(50K/499)RsIin,
Where Rs is the sense resistor set to 0.0033ohm
Or, to get the current from the reading:
Iin = (4.096/256) )(499/50K)ADC/0.0033 = 0.0479ADC1
with ADC1 in [0, 255] and Iin in [0, 12.2A]
ADC2 measures the main input voltage (48V nominal)
The reading is as follows:
ADC2 = (256/4.096V)(15K/295K)Vin,
or, to get the voltage from the reading:
Vin = (4.096V/256)(295K/15K)ADC2 = 0.315ADC2
with ADC2 in [0, 255] and Vin in [0, 80V]
Note: To find the power of the entire board, the input diodes need to be taken into account.
The drop in the two diodes is as follows:
Vd = Iin 0.1 + 0.7V
Add this value to the actual measurement to estimate the input voltage.
EnClk3A: Authorizes the telecom clock circuit to drive clock 3A to the backplane.
Must also be enabled in the Telco register.
EnClk3B: Authorizes the telecom clock circuit to drive clock 3B to the backplane.
Must also be enabled in the Telco register.
3VOC: 3.3V overcurrent status.
1: overcurrent
0: normal.
PCB: PCB revision.
Table 97. ADC1 and ADC2 Grab Data 21-22h
AddressActionD7D6D5D4D3D2D1D0
21-22h
Read ADC1 or ADC2 data
WriteNUNUNUNUNUNUNUNU
PowerUpNUNUNUNUNUNUNUNU
Table 98. Fabric Control 1 24h
Address Action D7 D6 D5 D4 D3 D2 D1 D0
24h
Read PCB 3VOC NU EnClk3B EnClk3A Reserved Reserved Reserved
Write NU NU NU EnClk3B EnClk3A Reserved Reserved Reserved
PowerUp NU NU NU 0 0 0 0 0