LM5064PMHSLASHNOPB datasheet(48/64 Pages) TI2

48 / 64 page

X =

(Y x 10

-R - b)

LM5064

SNVS718E – JUNE 2011 – REVISED FEBRUARY 2013

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READING AND WRITING TELEMETRY DATA AND WARNING THRESHOLDS

All measured telemetry data and user programmed warning thresholds are communicated in 12-bit two’s

compliment binary numbers read/written in 2 byte increments conforming to the Direct format as described in

section 8.3.3 of the PMBus Power System Management Protocol Specification 1.1 (Part II). The organization of

the bits in the telemetry or warning word is shown in Table 40, where Bit_11 is the most significant bit (MSB) and

Bit_0 is the least significant bit (LSB). The decimal equivalent of all warning and telemetry words are constrained

to be within the range of 0 to 4095, with the exception of temperature. The decimal equivalent value of the

temperature word ranges from 0 to 65535.

Table 40. Telemetry and Warning Word Format

Byte

Bit_7

Bit_6

Bit_5

Bit_4

Bit_3

Bit_2

Bit_1

Bit_0

Bit_11

Bit_10

Bit_9

Bit_8

Conversion from direct format to real-world dimensions of current, voltage, power, and temperature is

accomplished by determining appropriate coefficients as described in section 7.2.1 of the PMBus Power System

Management Protocol Specification 1.1 (Part II). According to this specification, the host system converts the

values received into a reading of volts, amperes, watts, or other units using the following relationship:

(34)

Where:

X: the calculated "real-world" value (volts, amps, watt, etc.)

m: the slope coefficient

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

R is only necessary in systems where m is required to be an integer (for example, where m may be stored in a

Table 41. Telemetry and Warning Conversion Coefficients

Commands

Condition

Format

Number of

Units

Data Bytes

READ_VIN, READ_AVG_VIN

DIRECT

4611

-642

-2

VIN_OV_WARN_LIMIT

VIN_UV_WARN_LIMIT

READ_VOUT, READ_AVG_VOUT

DIRECT

4621

423

-2

VOUT_UV_WARN_LIMIT

READ_VAUX

DIRECT

13808

-1

(1)READ_IIN, READ_AVG_IIN

CL = VDD

DIRECT

10742

1552

-2

MFR_IIN_OC_WARN_LIMIT

(1)READ_IN, READ_AVG_IN

CL = VEE

DIRECT

5456

2118

-2

MFR_IIN_OC_WARN_LIMIT

(1)READ_PIN, READ_AVG_PIN,

CL = VDD

DIRECT

1204

8524

-3

READ_PIN_PEAK

MFR_PIN_OP_WARN_LIMIT

(1)READ_PIN, READ_AVG_PIN,

CL = VEE

DIRECT

612

11202

-3

READ_PIN_PEAK

MFR_PIN_OP_WARN_LIMIT

READ_TEMPERATURE_1

DIRECT

16000

-3

°C

OT_WARN_LIMIT

OT_FAULT_LIMIT

(1)

The coefficients relating to current/power measurements and warning thresholds shown are normalized to a sense resistor (RS) value of

1 m

Ω. In general, the current/power coefficients can be calculated using the relationships shown in Table 42.

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