ltc2978 Linear Technology Corporation, ltc2978 Datasheet - Page 34

• Manufacturer Part Number: ltc2978
• Description: Octal Pmbus Power Supply Monitor And Controller With Eeprom
• Manufacturer: Linear Technology Corporation

ADC Monitoring Commands
READ_VIN
This command returns the most recent ADC measured
value of the voltage measured at the V
READ_VIN Data Contents
READ_VOUT
This command returns the most recent ADC measured
value of the channel’s output voltage. When odd channels
are configured to measure current, the data contents have
a slightly modified meaning, as described in the second
table below.
READ_VOUT Data Contents
READ_VOUT Data Contents—for Odd Channels Configured to
Measure Current
LTC2978
operaTion

b[15:0] Read_vin[15:0] The data uses the linear format:
b[15:0] Read_vout[15:0] The data uses the linear mode format as
b[15:0] Read_vout[15:0] The data uses the linear format:
BIT(S) SYMBOL
BIT(S) SYMBOL
Bit(s) Symbol
OPERATION
V(Symbol) = Y • 2
where N = b[15:11] is a 5-bit two’s
complement integer and
Y = b[10:0] is an 11-bit two’s complement
integer
Units: V
Operation
V(Symbol) = Y • 2
where N = b[15:11] is a 5-bit two’s
complement integer and
Y = b[10:0] is an 11-bit two’s complement
integer
Units: mV
OPERATION
defined by VOUT_MODE:
V(Read_vout) = Y • 2
an unsigned integer and N = Vout_mode_
parameter is a 5-bit two’s complement
exponent that’s hardwired to –13 decimal.
Units: V.
N
N
N
IN_SNS
where Y = b[15:0] is
pin.
READ_TEMPERATURE_1
This command returns the most recent ADC measured
value of junction temperature in °C as determined by the
LTC2978’s internal temperature sensor.
READ_TEMPERATURE_1 Data Contents
PMBUS_REVISION
The PMBUS_REVISION command register is read only and
reports the LTC2978 compliance to the PMBus standard
revision 1.1.
PMBUS_REVISION Data Contents
b[15:0] Read_temperature_1 [15:0] The data uses the linear format:
BIT(S) SYMBOL
BIT(S) SYMBOL
b[7:0] PMBus_rev
OPERATION
Reports the PMBus standard revision
compliance. This is hard-coded to ‘h11 for
revision 1.1.
OPERATION
Temp(Symbol) = Y • 2
Where N = b[15:11] is a 5-bit
two’s complement integer and
Y = b[10:0] is an 11-bit two’s
complement integer
Units: °C.
N
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