Activate VMODE control
In
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Set sys _nvmode1 and sys_nvmode2
signals polarity
YES
NO
Configure sys_nvmode1 and
sys_nvmode2 signals at device level
Set CONTROL.CONTROL_PADCONF_I2C4_SCL[15:0]
(sys_nvmode1) and
CONTROL.CONTROL _PADCONF_I2C4_SCL[ 31:16]
(sys_nvmode2) to mux mode1
Start
Set PRM_VOLTCTRL [4] SEL_VMODE bit to 0x1
Set PRM_POLCTRL[0] EXTVOL_POL bit
Configure the Power IC
Configure the external Power IC so that the corresponding VDD1
and VDD2 voltage values are set with regards to sys_nvmode1
and sys_nvmode2 low and high states
Has a sleep/wake-up
transition been initiated?
Sys_nvmode1 and
sys_nvmode2
automatically toggle
Set the voltage stabilization delays
Set PRM_VOLTSETUP1 register
Wait for
stabilization time
VDD1 and VDD2 are
set to the desired
values
prcm-UC-014
Public Version
PRCM Use Cases and Tips
www.ti.com
3.7.2.2.3 Summary Flow Chart
is a flow chart of VMODE voltage control.
Figure 3-105. Voltage Control Through VMODE Flow Chart
458
Power, Reset, and Clock Management
SWPU177N – December 2009 – Revised November 2010
Copyright © 2009–2010, Texas Instruments Incorporated