L6751B Datasheet, PDF (54/58 Pages) STMicroelectronics – Digitally controlled dual PWM for Intel VR12 and AMD SVI

PMBus support (preliminary)
L6751B
12.5
Output voltage monitoring (READ_VOUT)
The dedicated PMBus command allows the user to monitor output voltage for both sections.
The L6751B returns the value of the programmed VID in VID LSBs (i.e. number of LSBs.
C8h = 200 dec x 5 mV = 1.000 V).
12.6
Output current monitoring (READ_IOUT)
The dedicated PMBus command allows the user to monitor output current for both sections.
The L6751B returns the value of the delivered current by reading IMON voltage (same as
VR12 register 15h) in Amperes (linear format, N=0).
12.7
Temperature monitoring (READ_TEMPERATURE)
The dedicated PMBus command allows the user to monitor the temperature of the power
section for multi-phase. The L6751B returns the value of the temperature sensed by NTC
connected on the TM/STM pin (same as VR12 temperature zone) in degrees Celsius (linear
format, N=0).
12.8
Overvoltage threshold setting
The dedicated MFR_SPECIFIC command allows specific threshold for multi-phase and
single-phase sections to be programmed.
The threshold can be programmed according to Table 17. Different thresholds can be
configured for multi-phase and single-phase sections.
Table 17.
OV threshold setting
Data byte [Hex]
00h
01h
02h
03h
OC threshold [mV] (above programmed VID)
+175 mV (default)
+225 mV
+275 mV
+325 mV
54/58
This product is subject to a limited license from Power-One, Inc. related to digital power technology patents owned by Power-One,
Inc. This license does not extend to stand-lone power supply products.
Doc ID 024028 Rev 1