TPS65919-Q1 Datasheet, PDF (45/81 Pages) Texas Instruments – Power Management Unit (PMU) for Processor

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TPS65919-Q1
SLVSDM1 – AUGUST 2017
• The NSLEEP, ENABLE1, or ENABLE2 pins can be used for roof-floor control of SMPS. For roof-floor
operation, set the SMPSx_CTRL.ROOF_FLOOR_EN register, and assign SMPS to NSLEEP,
ENABLE1, and ENABLE2 in the NSLEEP_SMPS_ASSIGN, ENABLE1_SMPS_ASSIGN, and
ENABLE2_SMPS_ASSIGN registers, respectively. When the controlling pin is active, the value for the
SMPS output is defined by the SMPSx_VOLTAGE register. When the controlling pin is not active, the
value for the SMPS output is defined by the SMPSx_FORCE register.
• Set the second value for the output voltage with the SMPSx_FORCE.VSEL register. Setting this
register to 0x0 turns off the SMPS.
• Select which register, SMPSx_VOLTAGE or SMPSx_FORCE, to use with the SMPSx_FORCE.CMD
bit. The default is the voltage setting of SMPSx_VOLTAGE. For the CMD bit to work, ensure that the
SMPSx_CTRL.ROOF_FLOOR_EN bit is set to 0.
Figure 5-13 shows the SMPS controls for DVS.
Voltage Control Through I²C
SMPSx_CTRL.ROOF_FLOOR_EN = 0
SMPSx_VOLTAGE.VSEL⁽¹⁾, when SMPSx_FORCE.CMD = 1 ^{SMPSx_FORCE.VSEL, when SMPSx_FORCE.CMD = 0}
SMPSx_VOLTAGE.VSEL
SMPSx_OUT
t_(ramp)
Discharge control (pulldown)
SMPS_PD_CTRL.SMPSx (disable/
enabled)
Tstart
I²C⁽²⁾
Voltage Control Through External Pin
SMPSx_CTRL.ROOF_FLOOR_EN = 1
SMPSx_VOLTAGE.VSEL (ACTIVE mode)
SMPSx_FORCE.VSEL (SLEEP mode)
SMPSx_VOLTAGE.VSEL
SMPSx_OUT
t_(ramp)
Tstart
Discharge control (pulldown)
SMPS_PD_CTRL.SMPSx (disable/
enabled)
EN⁽³⁾
EN: Control through NSLEEP, ENABLE1, and ENABLE2 pins (see Resources SLEEP and ACTIVE Assignments table)
Figure 5-13. SMPS Controls for DVS
5.4.1.5.1 Non DVS-Capable Regulators
SMPS4 is a non-DVS-capable regulator. The slew rate of the output voltage is not controlled internally,
and the converter achieves the new output voltage in JUMP mode. When changes to the output voltage
are required, programming the changes to the output voltage of SMPS4 at a rate slower than 2.5 mV/μs is
recommended to avoid voltage overshoot or undershoot.
Copyright © 2017, Texas Instruments Incorporated
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Detailed Description
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