MCP2210 MICROCHIP [Microchip Technology], MCP2210 Datasheet - Page 5

• Manufacturer Part Number: MCP2210
• Description: USB-to-SPI Protocol Converter with GPIO (Master Mode)
• Manufacturer: MICROCHIP [Microchip Technology]

1.5
The MCP2210 has a built-in, USB 2.0, full-speed
transceiver internally connected to the USB module.
The USB transceiver obtains power from the V
which is internally connected to a 3.3V internal
regulator. The best electrical signal quality is obtained
when V
ceramic capacitor.
The internal 3.3V regulator draws power from the V
pin. In certain scenarios, where V
3.3V+ internal LDO dropout, the V
to an external regulated 3.3V. This will allow the USB
transceiver to work correctly, while the I/O voltage in
the rest of the system can be lower than 3.3V. As an
example, in a system where the MCP2210 is used and
the I/O required is of 2.2V, the V
tied to the 2.2V digital power rail, while the V
must be connected to a regulated 3.3V power supply.
1.5.1
The MCP2210 device has built-in pull-up resistors
designed to meet the requirements for full-speed USB.
1.5.2
The following are the main power options for the
MCP2210:
• USB Bus Powered (5V)
• Self Powered (from 3.3V to 5V), while the V
1.5.2.1
MCP2210 offers various options for power supply. To
meet the required USB signaling levels, MCP2210
device incorporates an internal LDO used solely by the
USB transceiver, in order to present the correct D+/D
voltage levels.
Figure 1-1
transceiver LDO in relation with the V
rail. The output of the USB transceiver LDO is tied to
the V
A capacitor connected to the V
USB transceiver LDO provides the 3.3V supply to the
transceiver.
 2011 Microchip Technology Inc.
pin is supplied with 3.3V (regulated). If the V
powered with 5V, then the V
by the internal regulator and the V
need only a decoupling capacitor
USB
USB
USB Transceiver
line.
shows the internal connections of the USB
INTERNAL PULL-UP RESISTORS
MCP2210 POWER OPTIONS
is locally bypassed with a high-quality
Internal Power Supply Details
USB
USB
DD
USB
will be powered
pin is required if the
USB
of the chip will be
DD
DD
pin must be tied
is lower than
pin will
power supply
USB
USB
DD
USB
is
pin,
pin
DD
FIGURE 1-1:
The provided V
voltage levels present on the GPIO and SPI module
pins (GP8-GP0, MOSI, MISO and SCK). When V
5V, all of these pins will have a logical ‘1’ around 5V
with the variations specified in
acteristics”.
For applications that require a 3.3V logical ‘1’ level,
V
the 3.3V voltage. In this case, the internal USB
transceiver LDO cannot provide the required 3.3V
power. It is necessary to also connect the V
the MCP2210 to the 3.3V power supply rail. This way,
the USB transceiver is powered up directly from the
3.3V power supply.
1.5.2.2
In Bus Power Only mode, the entire power for the
application is drawn from the USB (see
This is effectively the simplest power method for the
device.
FIGURE 1-2:
DD
must be connected to a power supply providing
V
V
BUS
V
USB
D+
D-
DD
USB Bus Powered (5V)
DD
voltage has a direct influence on the
MCP2210 INTERNAL
POWER SUPPLY DETAILS
BUS POWER ONLY
Transceiver
MCP2210
OUT
Section 4.1 “DC Char-
IN
USB
LDO
3.3V
DS22288A-page 5
V
V
V
SS
Figure
DD
USB
USB
pin of
DD
1-2).
is