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LTC2972

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READ_POUT

This command returns the most recent ADC measured value of the channel’s output power in watts.

MFR_READ_IOUT

This command returns the most recent ADC measured value of the channel’s output current, using a custom format

that provides better numeric representation granularity than the READ_IOUT command for currents whose absolute

value is between 2A and 82A.

MFR_READ_IOUT Data Contents

BIT(S) SYMBOL

OPERATION

b[15:0] Mfr_read_iout[15:0]

Channel output current expressed in custom format for improved resolution at high currents.

Value = Y • 2.5 where Y = b[15:0] is a signed two’s-complement number.

Example:

MFR_READ_IOUT = 5mA

For b[15:0] = 0x0002

Value = 2 • 2.5 = 5mA

The granularity of the returned value is always 2.5mA, and the return value is limited to ±81.92A. The READ_IOUT

command provides the best resolution for currents less than 2A and must be used for currents larger than 82A. Note

that the accuracy of the returned value is always limited by the ADC Characteristics listed in the Electrical Character-

istics section.

Table 3. Comparison of Granularity Due to Numeric Format

CURRENT RANGE

READ_IOUT

GRANULARITY

MFR_READ_IOUT

GRANULARITY

31.25mA ≤ IOUT < 62.5mA

61µA

2.5mA

62.5mA ≤ IOUT < 125mA

122µA

2.5mA

125mA ≤ IOUT < 250mA

244µA

2.5mA

250mA ≤ IOUT < 500mA

488µA

2.5mA

0.5A ≤ IOUT < 1A

977µA

2.5mA

1A ≤ IOUT < 2A

1.95mA

2.5mA

2A ≤ IOUT < 4A

3.9mA

2.5mA

4A ≤ IOUT < 8A

7.8mA

2.5mA

8A ≤ IOUT < 16A

15.6mA

2.5mA

16A ≤ IOUT < 32A

31.3mA

2.5mA

32A ≤ IOUT < 64A

62.5mA

2.5mA

64A ≤ IOUT < 82A

125mA

2.5mA

82A ≤ IOUT < 128A

125mA

Saturated

128A ≤ IOUT < 256A

250mA

Saturated

PMBus COMMAND DESCRIPTION

LTC2972 Datasheet(PDF) 77 Page - Linear Technology

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