PXD10RM Datasheet, PDF (1240/1332 Pages) Freescale Semiconductor, Inc – PXD10 Microcontroller

Field
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Table 40-3. VREG_CTL Field Descriptions
Description
Reserved.
5 V LVD MASK: Mask bit for 5 V LVD from regulator
This is a read/write bit and must be unmasked by writing a ‘1’ by software to generate LVD functional
reset request to MC_RGM for 5 V trip.
1 5 V LVD is masked
0 5 V LVD is not masked.
40.4 Functional description
40.4.1 High Power or Main Regulator (HPREG)
The HPREG converts the 3.3 V to 5 V input supply voltage to the 1.2 V digital supply. The nominal target
output is 1.2 V. The actual output will be in range of 1.08–1.32 V in the full current load range 0–400 mA
after trimming.
The HPREG regulator requires an external NPN ballast transistor. Recommended transistors are BCP68
from ON Semiconductor or BCP56 from STMicroelectronics.
Stabilization of the HPREG is achieved using an external capacitance.
The regulator can be switched off by software.
40.4.2 Low Power Regulator (LPREG)
The LPREG generates power for the chip in STOP mode, providing the output supply of 1.2 V. The control
part of the regulator can be used to disable the low power regulator. This action is managed by MC_ME.
40.4.3 Ultra Low Power Regulator (ULPREG)
The ULPREG generates power for the standby domain as well as a part of the main domain. The control
circuit of ULPREG can be used to disable the ultra low power regulator by SW. This action is managed by
MC_ME.
40.4.4 Low Voltage Detectors (LVD) and Power On Reset (POR)
Four LVDs are available (see Figure 40-1).
• ULVDM for the 3.3 V to 5 V input supply with threshold at the 3.3 V level
• ULVDM5 for the 3.3 V to 5 V input supply with threshold at the 5 V level
• Two LVD_DIGs, ULVDD and MLVDD, for the 1.2 V output voltage
ULVDM and ULVDM5 sense the 3.3 V to 5 V power supply for CORE, shared with the GPIO ring supply,
and indicate when the 3.3 V to 5 V supply is stable. The threshold levels of ULVDM5 are trimmable with
the help of LVDM5[0:3] trim bits.
40-4
PXD10 Microcontroller Reference Manual, Rev. 1
Preliminary—Subject to Change Without Notice
Freescale Semiconductor