Technical Product Specification

2BPower Sub-System Intel® Server System SR1690WB TPS
Revision 1.7
Intel order number: E72797-009
18
Literal data format: X = Y · 2
N
X = the sensor value in volts, amps, watts, degrees C, or RPM
Y = mantissa. The mantissa is the variable components that changes as the sensor value
changes. Y is a 16-bit unsigned value for the READ_VOUT command. For all other READ
commands, Y is an 11-bit signed 2’s compliment value. N = exponent. The exponents are
fixed for each power supply and define the resolution for each sensor.
3.8.3 Monitoring power/current/voltage
The following PMBus commands are supported for the purpose of monitoring currents,
voltages, and power
Table 17. PMBus Commands
PMBus command
Description
READ_IIN RMS input current in amps
READ_VIN
RMS input voltage in volts
READ PIN AC input power in watts
3.8.4 Accuracy
The sensor commands meet the following accuracy requirements.
Required Accuracy (+/-x% of reading)
Output Loading
10% - 20%
>20% - 50%
>50% - 100%
READ_IIN
+/-15%
+/-5%
+/-5%
READ_PIN
+/-15%
+/-5%
+/-5%
READ_VIN
+/-5% over full range
READ_TEMPERATURE
+/-3 ºC
3.8.5 Thermal Management
The following commands are supported for monitoring temperature, monitor fan speed, and
controlling the power supply fan. The fan monitoring is configured to provide a value in RPM.
The fan control is in RPM too. All temperature sensors and fans in the power supply are
accessible via PMBus.
Table 18. Thermal Management Commands
Command
Description
READ_FAN_SPEED_1 Returns the fan speed in RPM of fan sensor 1.
READ_FAN_SPEED_2
Returns the fan speed in RPM of fan sensor 2.