PXR40RM Datasheet, PDF (134/1434 Pages) Freescale Semiconductor, Inc – PXR40 Microcontroller

Power Management Controller (PMC)
5.1.1.1 Analog PMC_SMPS features
• Embedded voltage regulator (2.7 V up to 5.5 V regulator supply (VDDREG)) controller for
generating core VDD voltage. For the correct allowed voltage range refer to PXR40
Microcontroller Data Sheet.
• The PMC supports two regulation modes (linear and switch mode), which are controlled by
REGSEL pin.
• When VDDREG is above 4.0 V roughly, the 3.3 V internal linear regulator is enabled and regulates
the VDDSYN ball to a nominal 3.3 V, sense point is taken on VDD33. VDDSYN and VDD33 must
be connected/shorted together with minimum impedance (no resistors or inductors allowed).
• Monitors the following supplies:
— core voltage pin that connects in the package to core voltage
— 3.3V via the VDD33 pin (input to the 3.3V network)
— 5V on VDDREG
• Disabling 3.3 V internal regulator
— See Section 5.5.4, 3.3V Internal Voltage Regulator. If VDDREG is 5 V, you need to drive
VDD33/VDDSYN at 3.5 V +/- 3% and program the PMC to regulate the 3.3 V at minimum
voltage by programming the correspondent control nibble to eliminate contention between the
two regulators.
5.1.1.2 Digital PMC_SMPS features
Software interfaces for:
• low voltage detects and POR circuits from the PMC analog blocks plus LVD from VDDSYN
segment as 3.3V LVD
• low voltage detects for reset segment LVD (VDDEH1)
• POR level of reset pin segement (VDDEH1)
• low voltage detects for other IO segement LVD (VDDEH3, VDDEH4, VDDEH5, VDDEH6,
VDDEH7)
• low voltage detect on VDDA (from ADC band gap reference)
• standby regulator brownout circuit
PXR40 Microcontroller Reference Manual, Rev. 1
5-2
Freescale Semiconductor