MCP2200_13 datasheet(7/44 Pages) MICROCHIP

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 2011 Microchip Technology Inc.

DS22228B-page 7

MCP2200

FIGURE 1-4:

TYPICAL POWER SUPPLY

OPTION USING THE 5V

PROVIDED BY THE USB

1.5.2.3

3.3V Self Powered

Typically, many embedded applications are using 3.3V

power supplies. When such an option is available in the

target system, MCP2200 can be powered up from the

existing 3.3V power supply rail. The typical connections

for MCP2200 are shown in Figure 1-5.

In this example MCP2200 has both VDD and VUSB lines

tied to the 3.3V rail. These tied connections disable the

internal USB transceiver LDO of the MCP2200 to reg-

ulate the power supply on VUSB pin. Another conse-

quence is that the ‘1’ logical level on the GPIO pins will

be at the 3.3V level, in accordance with the variations

specified in Section 3.1, DC Characteristics.

FIGURE 1-5:

USING AN EXTERNALLY

PROVIDED 3.3V POWER

SUPPLY

1.6

GPIO Module

The GPIO Module is a standard 8-bit I/O port.

1.6.1

CONFIGURABLE PIN FUNCTIONS

The pins can be configured as:

• GPIO – individually configurable general purpose

input or output

• SSPND – USB Suspend state

• USBCFG – indicates USB configuration status

• RxLED – indicates USB receive traffic

• TxLED – indicates USB transmit traffic

1.6.1.1

SSPND Pin Function

The SSPND pin (if enabled) reflects the USB state

(Suspend/Resume). The pin is active ‘low’ when the

Suspend state has been issued by the USB host.

Likewise, the pin drives ‘high’ after the Resume state is

achieved.

This pin allows the application to go into Low Power

mode when USB communication is suspended, and

switches to a full active state when USB activity is

resumed.

1.6.1.2

USBCFG Pin Function

The USBCFG pin (if enabled) starts out ‘low’ during

power-up or after Reset, and goes ‘high’ after the

device successfully configures to the USB. The pin will

go ‘low’ when in Suspend mode and ‘high’ when the

USB resumes.

LDO

3.3V

USB

Transceiver

D+

VDD

VUSB

D-

OUT

5V (USB Bus)

or external

power supply

LDO

3.3V

D+

VDD

VUSB

D-

OUT

5V (USB Bus)

or external

power supply

External

USB

Transceiver

3.3V

LDO

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