Datasheet

X =
1
m
(Y x 10
-R
- b)
LM25066I, LM25066IA
SNVS824C –JUNE 2012–REVISED MARCH 2013 www.ti.com
– b = -355
– R = -1
(39)
where:
X: the calculated "real world" value (volts, amps, watts, temperature)
m: the slope coefficient, a the two byte two's complement integer
Y: a two byte, two's complement integer received from device
b: the offset, a two byte two's complement integer
R: the exponent, a one byte two's complement integer
The above procedure can be repeated to determine the coefficients of any telemetry channel simply by
substituting measured current for some other parameter (e.g. power, voltage, etc.).
Writing Telemetry Data
There are several locations that will require writing data if their optional usage is desired. Use the same
coefficients previously calculated for your application and apply them using this method as prescribed by the
PMBus™ revision section 7.2.2 "Sending a Value"
Y = (mX + b) x 10
R
(40)
where:
X: the calculated "real world" value (volts, amps, watts, temperature)
m: the slope coefficient, a two byte two's complement integer
Y: a two byte two's complement integer received from device
b: the offset, a two byte two's complement integer
R: the exponent, a one byte two's complement integer
PMBus™ Address Lines (ADR0, ADR1, ADR2)
The three address lines are to be set high (connect to VDD), low (connect to GND),open (connect to GND) to
select one of 27 addresses for communicating with the LM25066I/A. Table 47 depicts 7-bit addresses (eighth bit
is read/write bit):
Table 47. Device Addressing
ADR2 ADR1 ADR0 Decoded Address
Z Z Z 40h
Z Z 0 41h
Z Z 1 42h
Z 0 Z 43h
Z 0 0 44h
Z 0 1 45h
Z 1 Z 46h
Z 1 0 47h
Z 1 1 10h
0 Z Z 11h
0 Z 0 12h
0 Z 1 13h
0 0 Z 14h
0 0 0 15h
0 0 1 16h
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