Pmbus Control Register 3 (Pmbctrl3); Pmbus Control Register 3 (Pmbctrl3) Register Field Descriptions; Pmbus Addressing - Texas Instruments UCD3138 Technical Reference Manual

www.ti.com

8.13 PMBus Addressing

UCD3138 offers two constant current sources for excitation of resistors used for setting the PMBus
address, as shown in
and are disabled as default. The nominal current is preset to 10 µA.
To activate these current sources the following bits in PMBCTRL3 register in
need to be set.
PMBusRegs.PMBCTRL3.bit.IBIAS_A_ENA = 1;
PMBusRegs.PMBCTRL3.bit.IBIAS_B_ENA = 1;

8.13.1 PMBus Control Register 3 (PMBCTRL3)

Address FFF7F620
20
CLK_LO_DIS IBIAS_B_EN
R/W-0
LEGEND: R/W = Read/Write; R = Read only; -n = value after reset
Table 8-2. PMBus Control Register 3 (PMBCTRL3) Register Field Descriptions
Bit Field
20 CLK_LO_DIS
19 IBIAS_B_EN
18 IBIAS_A_EN
17 SCL_DIR
16 SCL_VALUE
15 SCL_MODE
SNIU028A – February 2016 – Revised April 2016
Submit Documentation Feedback
Figure 8-13. The two current sources are connected to CH-0 and CH-1 of ADC-12
Figure 8-12. PMBus Control Register 3 (PMBCTRL3)
19 18
IBIAS_A_EN
R/W-0 R/W-0
Type Reset
R/W 0
R/W 0
PMBus Current Source B Control
0 = Disables Current Source for PMBUS address detection thru ADC (Default)
1 = Enables Current Source for PMBUS address detection thru ADC
R/W 0
PMBus Current Source A Control
0 = Disables Current Source for PMBUS address detection thru ADC (Default)
1 = Enables Current Source for PMBUS address detection thru ADC
R/W 0
R/W 0
R/W 0
Copyright © 2016, Texas Instruments Incorporated
PMBUS registers section
17 16
SCL_DIR SCL_VALUE
R/W-0 R/W-0
Description
PMBus Addressing
15
SCL_MODE
R/W-0
307
ADC12 Overview