Datasheet

LM5066
www.ti.com SNVS655G –JUNE 2011–REVISED FEBRUARY 2013
Table 42. Current and Power Telemetry and Warning Conversion Coefficients (R
S
in mΩ)
Commands Condition Format Number of m b R Units
Data Bytes
(1)
READ_IIN, READ_AVG_IIN CL = VDD DIRECT 2 10753 x R
S
-1200 -2 A
MFR_IIN_OC_WARN_LIMIT
(1)
READ_IIN, READ_AVG_IIN CL = GND DIRECT 2 5405 x R
S
-600 -2 A
MFR_IIN_OC_WARN_LIMIT
(1)
READ_PIN, READ_AVG_PIN, CL = VDD DIRECT 2 1204 x R
S
-6000 -3 W
READ_PIN_PEAK
MFR_PIN_OP_WARN_LIMIT
(1)
READ_PIN, READ_AVG_PIN, CL = GND DIRECT 2 605 x R
S
-8000 -3 W
READ_PIN_PEAK
MFR_PIN_OP_WARN_LIMIT
(1) The coefficients relating to current/power measurements and warning thresholds shown in Table 41 are normalized to a sense resistor
(R
S
) value of 1mΩ. In general, the current/power coefficients can be calculated using the relationships shown.
Care must be taken to adjust the exponent coefficient, R, such that the value of m remains within the range of -
32768 to +32767. For example, if a 5 mΩ sense resistor is used, the correct coefficients for the READ_IIN
command with CL = VDD would be m = 5359, b = -120, R = -1.
A Note on the "b" Coefficient
Since b coefficients represent offset, for simplification b is set to zero in the following discussions.
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