MCP2221 datasheet(19/80 Pages) MICROCHIP

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 2015 Microchip Technology Inc.

DS20005292B-page 19

MCP2221

1.7.1.4

LED_URX

The “RX” in this pin name refers to the UART of the

MCP2221. The LED_URX pin is an indicator of UART

RX characters being received.

This pin will pulse low or high (depending on the chip

configuration settings; see the CHIPSETTING0

milliseconds). This allows the application to provide a

visual indication of the UART RX traffic.

1.7.1.5

LED_UTX

The “TX” in this pin name refers to the UART of the

MCP2221. The LED_UTX pin is an indicator of UART

TX characters being transmitted.

This pin will pulse low or high (depending on the chip

configuration settings; see the CHIPSETTING0

milliseconds). This allows the application to provide a

visual indication of the UART TX traffic.

1.7.1.6

LED_I2C

The “I2C” in this pin name refers to the I2C module in

the MCP2221. The LED_I2C pin is an indicator of I2C

activity.

This pin will pulse low or high (depending on the chip

configuration settings; see the CHIPSETTING0

milliseconds). This allows the application to provide a

visual indication of the I2C traffic.

1.7.1.7

ADC1/2/3

When GP1/2/3 are configured for ADC operation, they

will work as analog input pins and they are tied to the

first three channels of the 10-bit ADC in the MCP2221.

1.7.1.8

DAC1/2

When GP2/3 are configured for DAC operation, they

will work as analog output pins and they are tied to the

output of the MCP2221’s 5-bit DAC.

TABLE 1-5:

GP DESIGNATION TABLE

Designation

Bits <2:0>

Assignment

GP0

GP1

GP2

GP3

000

GPIO

001

DEDICATED_FUNC

SSPND

CLK OUT

USBCFG

LED_I2C

010

ALT_FUNC_0

LED_URX

ADC1

ADC2

ADC3

011

ALT_FUNC_1

—

LED_UTX

DAC1

DAC2

100

ALT_FUNC_2

—

IOC

—

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