MCP2210 MICROCHIP [Microchip Technology], MCP2210 Datasheet - Page 6

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

MCP2210
In order to meet the inrush current requirements of the
USB 2.0 specifications, the total effective capacitance
appearing across V
than 10 µF. If it is more than 10 µF, some kind of inrush
limiting is required. For more details on Inrush Current
Limiting, see the current Universal Serial Bus Specifi-
cation.
According to the USB 2.0 specification, all USB devices
must also support a Low-Power Suspend mode. In the
USB Suspend mode, devices must consume no more
than 500 µA (or 2.5 mA for high powered devices that
are remote wake-up capable) from the 5V V
the USB cable.
The host signals the USB device to enter Suspend
mode by stopping all USB traffic to that device for more
than 3 ms.
The USB bus provides a 5V voltage. However, the USB
transceiver requires 3.3V for the signaling (on D+ and
D- lines).
During USB Suspend mode, the D+ or D- pull-up resis-
tor must remain active, which will consume some of the
allowed suspend current budget (500 µA/2.5 mA).
The V
capacitor. It is recommended that the capacitor be a
ceramic cap, between 0.22 and 0.47 µF.
Figure 1-3
LDO is used to provide 3.3V to the USB transceiver.
The voltage on the V
the GP and SPI module pins (GP8-GP0, MOSI, MISO
and SCK). With V
‘1’ of 5V with the variations specified in
“DC
FIGURE 1-3:
DS22288A-page 6
5V (USB Bus)
or external
power supply
Characteristics”.
USB
pin is required to have an external bypass
shows a circuit where the MCP2210 internal
DD
BUS
V
DD
at 5V, these pins will have a logic
V
D+
D-
USB
TYPICAL POWER SUPPLY
OPTION USING THE 5V
PROVIDED BY THE USB
DD
and ground must be no more
affects the voltage levels onto
Transceiver
OUT
IN
USB
LDO
3.3V
Section 4.1
BUS
line of
1.5.2.3
Typically, many embedded applications are using 3.3V
or lower power supplies. When such an option is avail-
able in the target system, MCP2210 can be powered
up (V
cal connections for MCP2210 powered from 3.3V rail
are shown in
In this example MCP2210 has both V
tied to the 3.3V rail. These tied connections disable the
internal USB transceiver LDO of the MCP2210 to
regulate the power supply on V
consequence is that the ‘1’ logical level on the GP and
SPI pins will be at the 3.3V level, in accordance with the
variations
Characteristics”.
FIGURE 1-4:
5V (USB Bus)
or external
power supply
DD
) from the existing power supply rail. The typi-
Figure
3.3V – Self Powered
specified
External
3.3V
LDO
1-4.
USING AN EXTERNALLY
PROVIDED 3.3V POWER
SUPPLY
 2011 Microchip Technology Inc.
in
V
V
USB
D+
D-
DD
Section 4.1
USB
DD
and V
Transceiver
OUT
pin. Another
IN
LDO
3.3V
USB
USB
lines
“DC