Datasheet

LTC2974
68
2974fc
For more information www.linear.com/LTC2974
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. Use the READ_IOUT
command for larger currents. Note that the accuracy of the returned value is always limited by the ADC Characteristics
listed in the Electrical Characteristics section.
Comparison of Granularity Due to Numeric Format
CURRENT RANGE
READ_IOUT
GRANULARITY
MFR_READ_IOUT
GRANULARITY
31.25mA ≤ I
OUT
< 62.5mA 61µA 2.5mA
62.5mA ≤ I
OUT
< 125mA 122µA 2.5mA
125mA ≤ I
OUT
< 250mA 244µA 2.5mA
250mA ≤ I
OUT
< 500mA 488µA 2.5mA
0.5A ≤ I
OUT
< 1A 977µA 2.5mA
1A ≤ I
OUT
< 2A 1.95mA 2.5mA
2A ≤ I
OUT
< 4A 3.9mA 2.5mA
4A ≤ I
OUT
< 8A 7.8mA 2.5mA
8A ≤ I
OUT
< 16A 15.6mA 2.5mA
16A ≤ I
OUT
< 32A 31.3mA 2.5mA
32A ≤ I
OUT
< 64A 62.5mA 2.5mA
64A ≤ I
OUT
< 82A 125mA 2.5mA
82A ≤ I
OUT
< 128A 125mA Saturated
128A ≤ I
OUT
< 256A 250mA Saturated
MFR_IOUT_SENSE_VOLTAGE
This command returns the absolute value of the voltage measured between I
SENSEPn
and I
SENSEMn
during the last
READ_IOUT ADC conversion without any temperature correction.
MFR_IOUT_SENSE_VOLTAGE Data Contents
BIT(S) SYMBOL OPERATION
b[15:0] Mfr_iout_sense_voltage Absolute value of raw voltage conversion measured between I
SENSEPn
and I
SENSEMn
.
Value = Y • 0.025 • 2
–13
where Y = b[15:0] is an unsigned integer.
Example:
MFR_IOUT_SENSE_VOLTAGE = 1.544mV
For b[15:0] = 0x1FA=506
Value = 506 • 0.025 • 2
–13
= 1.544mV
pMbus coMManD DescripTion