STM32MP157C datasheet(29/260 Pages) STMICROELECTRONICS

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DS12505 Rev 5

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STM32MP157C/F

Functional overview

3.8

Power supply management

3.8.1

Power supply scheme

•

The VDD is the main supply for I/Os and internal part kept powered during Standby

mode. Useful voltage range is 1.71 V to 3.6 V (e.g. 1.8 V, 2.5 V, 3.0 V or 3.3 V typ.)

–VDD_DSI, VDD_PLL and VDD_ANA must be star-connected to VDD.

•

The VDDCORE is the main digital voltage and is usually shutdown during Standby mode.

Voltage range during Run mode is 1.18 V to 1.25/1.38 V (1.2/1.34 V typ.), see

Table 13: General operating conditions.

•

The VBAT pin can be connected to the external battery (1.2 V < VBAT < 3.6 V). If no

external battery is used, it is mandatory to connect this pin to VDD.

•

The VDDA pin is the analog (ADC/DAC/VREF), supply voltage range is 1.71 V to 3.6 V.

DAC can only be used when VDDA is above or equal 1.8 V. Using Internal VREF+

requires VDDA equal to or higher than VREF+ + 0.3 V.

•

The VDDA1V8_REG pin is the output of internal regulator and connected internally to

USB PHY and USB PLL. Internal VDDA1V8_REG regulator is enabled by default and can

be controlled by software. It is always shut down during Standby mode.

There is specific BYPASS_REG1V8 pin that must be connected either to VSS or VDD to

activate or deactivate the voltage regulator. It is mandatory to bypass the 1.8 V

regulator when VDD is below 2.25 V (BYPASS_REG1V8 = VDD). In that case,

VDDA1V8_REG pin must be connected to VDD (if below 1.98 V) or to a dedicated

1.65 V - 1.98 V supply (1.8 V typ.).

•

VDDA1V8_DSI is the analog DSI supply. Voltage range is 1.65 V to 1.98 V. (1.8 V typ.)

Should be connected to VDDA1V8_REG.

•

VDDA1V1_REG pin is the output of internal regulator connected internally to USB PHY.

Internal VDDA1V1_REG regulator is enabled by default and can be controlled by

software. It is always shut down during Standby mode.

•

VDDA1V2_DSI_REG pin is the output of internal regulator and connected internally to

DSI PLL.

•

VDDA1V2_DSI_PHY is the analog DSI PHY supply and should be connected to

VDDA1V2_DSI_REG.

•

VDD3V3_USBHS and VDD3V3_USBFS are respectively the USB high-speed and full-speed

PHY supply. Voltage range is 3.07 V to 3.6 V. VDD3V3_USBFS is used to supply

OTG_VBUS and ID pins. So, VDD3V3_USBFS must be supplied as well when USB high-

speed OTG device is used. If not used, must be connected to VDD.

Caution:

VDD3V3_USBHS must not be present unless VDDA1V8_REG is present, otherwise permanent

STM32MP157C/F damage could occur. Must be ensured by PMIC ranking order or with

external component in case of discrete component power supply implementation.

•

VDDQ_DDR is the DDR IO supply.

–

Voltage range is 1.425 V to 1.575 V for interfacing DDR3 memories (1.5 V typ.).

–

Voltage range is 1.283 V to 1.45 V for interfacing DDR3L memories (1.35 V typ.).

–

Voltage range is 1.14 V to 1.3 V for interfacing LPDDR2 or LPDDR3 memories

(1.2 V typ.).

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