LM5064PMHSLASHNOPB datasheet(43/64 Pages) TI2

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LM5064

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SNVS718E – JUNE 2011 – REVISED FEBRUARY 2013

Table 30. DEVICE_SETUP Byte Format (continued)

Bit

Name

Meaning

Unused

In order to configure the Current Limit Setting via this register, it is necessary to set the Current Limit

Configuration bit (2) to 1 to enable the register to control the current limit function and the Current Limit Setting

bit (4) to select the desired setting. If the Current Limit Configuration bit is not set, the pin setting will be used.

The Circuit Breaker to Current Limit ratio value is set by the CB / CL Ratio bit (3). Note that if the Current Limit

Configuration is changed, the samples for the telemetry averaging function will not be reset. It is recommeded to

allow a full averaging update period with the new Current Limit Configuration before processing the averaged

data.

Note that the Current Limit Configuration affects the coefficients used for the Current and Power measurements

and warning registers.

MFR_SPECIFIC_10: BLOCK_READ (DAh)

The BLOCK_READ command concatenates the DIAGNOSTIC_WORD with input and output telemetry

information (IIN, VOUT, VIN, PIN) as well as READ_TEMPERATURE_1 to capture all of the operating

information of the LM5064 in a single SMBus transaction. The block is 12 bytes long with telemetry information

being sent out in the same manner as if an individual READ_XXX command had been issued (shown below).

The contents of the block read register are updated every clock cycle (85ns) as long as the SMBus interface is

idle. BLOCK_READ also ensures that the VIN, VOUT, IIN and PIN measurements are all time-aligned. If

separate commands are used, individual samples may not be time-aligned, because of the delay necessary for

the communication protocol.

The Block Read command is read via the PMBus block read protocol.

Table 31. BLOCK_READ Register Format

Byte Count (always 12)

(1 byte)

DIAGNOSTIC_WORD

(1 Word)

IIN_BLOCK

(1 Word)

VOUT_BLOCK

(1 Word)

VIN_BLOCK

(1 Word)

PIN_BLOCK

(1 Word)

TEMP_BLOCK

(1 Word)

MFR_SPECIFIC_11: SAMPLES_FOR_AVG (DBh)

The SAMPLES_FOR_AVG command is a manufacturer specific command for setting the number of samples

used in computing the average values for IIN, VIN, VOUT, PIN. The decimal equivalent of the AVGN nibble is the

power of 2 samples, (e.g. AVGN=12 equates to N=4096 samples used in computing the average). The LM5064

supports average numbers of 1, 2, 4, 8, 16, 32, 64, 128, 256, 512, 1024, 2048, 4096. The SAMPLES_FOR_AVG

number applies to average values of IIN, VIN, VOUT, PIN simultaneously. The LM5064 uses simple averaging.

This is accomplished by summing consecutive results up to the number programmed, then dividing by the

number of samples. Averaging is calculated according to the following sequence:

Y = (X(N) + X(N-1) + ... + X(0)) / N

(33)

When the averaging has reached the end of a sequence (for example, 4096 samples are averaged), then a

whole new sequence begins that will require the same number of samples (in this example, 4096) to be taken

before the new average is ready.

Table 32. SAMPLES_FOR_AVG Register

AVGN

N = 2AVGN

Averaging/Register Update Period (ms)

0000

0001

0010

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