I am trying to calculate the values that are being sent to a UCD9244 for FAST_OC_FAULT_LIMIT, IOUT_OC_FAULT_LIMIT, etc. To calculate the values that are being sent I use the methods shown in http://pmbus.org/docs/Using_The_PMBus_20051012.pdf. However the values I calculate are way off from what is stated in the PMBus script file. For example, for FAST_OC_FAULT_LIMIT, the lines in the script file are:
# Write FAST_OC_FAULT_LIMIT [MFR 39,Rail #1] 9.00 A/Phase
I2CWrite 68 F7 40 D2
The spec states that this is a Linear11 format, so the first 5 bits are the two's compliment exponent and the next 11 are the two's compliment mantissa. So I get 01000 for the exponent or 2y8=256, and 00100000000 or 256 for the mantissa. Multiplying these together I get 65536A???!!! The other numbers I try to calcualte give me similar way out results. Can someone tell me what I am missing here?
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