User guide

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. Table 4-2 lists
the voltage ranges supported for both the operating modes.
Note: See the MBR3 device datasheet 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 Externally Regulated Operation Mode on page 37 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
Operating Voltage Range Internally Regulated Mode Externally Regulated Mode
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