CYONS2100-LBXC Cypress Semiconductor Corp, CYONS2100-LBXC Datasheet - Page 10

• Manufacturer Part Number: CYONS2100-LBXC
• Description: IC SENSOR LASER OVATION 42-QFN
• Manufacturer: Cypress Semiconductor Corp

Specifications of CYONS2100-LBXC

• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant, Lead free / RoHS Compliant

Power Supply Connections
Overview
The CYONS2100 incorporates a powerful and flexible powering
system. It can be powered from one of two sources: a 5V supply
(typically from the USB VBUS line) or an external 3.3V supply.
Additionally, the CYONS2100’s internal regulators can supply
current to external devices. This section describes the capabil-
ities and usage of the power system. Refer to
diagram of the CYONS2100’s power system.
Understanding DVDD
DVDD is a unique pin because it can serve as either an input or
an output. When the device is powered from USB (using the 3.3V
Regulator), DVDD acts as an output, providing a 3.3V voltage
that can be used to power AVDD, VREGD, VREGA, and external
parts. When the device is powered from an external 3.3V supply,
DVDD acts as an input only.
AVDD, VREGA, and VREGD
As with DVDD, these signals power the internal circuitry of the
device. Unlike DVDD, these are always inputs. They should be
connected as shown in the figure.
Document Number: 001-44046 Rev. *A
External 3.3V
Supply, 15
mA max
4.25 - 5.25 V
Digital
GND
10 nH
10
uF
10
uF
Digital
GND
Analog
GND
Figure 6
Figure 6. Power Connections
VDD5V
VREGD 6
VREGA
DVDD
AVDD
ADVANCE
for a block
Analog
GND
42
8
5
7
1.8V Analog
1.8V Analog
Regulator
Circuitry
Using USB Power
For most USB applications, the device is powered from the USB
VBUS signal. In this case, the 5V VBUS signal should be
connected directly to the CYONS2100’s VDD5V pin.
Using External Power
The CYONS2100 can also be powered from an external source.
In this case, the external 3.3V source should connect to DVDD,
and VDD5V should be left unconnected.
Filtering and Grounding
For all designs, it is important to provide proper grounding and
proper isolation between the analog and digital power supplies.
The analog and digital grounds should be isolated, except for a
single connection point that is placed very close to the device.
On the supply side, an L-C filter should be placed between AVDD
and DVDD, as shown in the figure.
Analog
GND
Regulator
3.3V
3V Analog
Circuitry
CYONS2100
1.8V Digital
1.8V PSoC
Regulator
Circuitry
Digital
GND
Core
Regulator
USB IO
Digital
GND
3V Digital
Circuitry
Digital
GND
CYONS2100
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