Cypress Semiconductor CY3280-MBR3 ユーザーズマニュアル

CY3280-MBR3 Evaluation Kit User Guide, Doc. #: 001-89905 Rev. *B

36

Hardware

4.3.3

Power Supply System

The CY8CMBR3116 device supports operation from 1.71 V to 5.5 V. The CY8CMBR3116 device
has two modes of operation: internally regulated mode and externally regulated mode. 

 lists

the voltage ranges supported for both the operating modes.

Note: See the 

 for more details. 

The power supply system on this board is versatile, allowing the input supply to come from the fol-
lowing sources:

■

5-V power from the onboard USB Mini-B header (J10)

■

5-V power from an Arduino board or an external supply using pin 4 of the J1 header

The power system of this kit is designed to support 1.8-V, 3.3-V, and 4.7-V operation of the
CY8CMBR3116 device. At 1.8 V, the kit can be operated in either internally regulated or externally
regulated mode. By default, the kit and example projects are designed to operate in internally regu-
lated mode. See 

 to operate the kit in externally

regulated mode. The PSoC 5LP firmware configures the required voltage according to the selection
made while connecting to the USB-I

2

C bridge. This configuration is performed by monitoring the

Vbus voltage and enabling the LDO regulator (U2–MIC 5219). When the kit is powered externally
through the J1 header, the kit operational voltage is regulated to 3.3 V. 

When the board is powered using the Arduino header, a PolyZen protection device (U4) is added in
series with the 5-V external power line to protect against overvoltage and reverse-voltage scenarios.
The device can protect overvoltage and reverse voltage up to 12 V.

Figure 4-2.  Power Supply Block Diagram with Protection Circuits

Table 4-2.  Operating Voltage Ranges for CY8CMBR3116 Device Modes

1.71 V to 1.8 V

No

Yes

1.8 V to 1.89 V

Yes

Yes

1.89 V to 5.5 V

Yes

No

I/O Header

Protection 

Device

5V_EXT

5.0 V

LDO

PSoC 5LP

Vdd, Vddio0, Vddio1

Vddio2 and 

Vddio3

MBR3

VDD

SDA, SCL, Host 
INT and MBR3 
XRES

USB

PTC

ESD 

Protection

Jumper for Current Measurement of 

MBR3

Jumper for 

Whole Kit 

Current 

Measurement

J11

J12

Control Lines

EN_CTRL, 3.3_CTRL,

1.8_CTRL