MCP2221 datasheet(36/80 Pages) MICROCHIP

36 / 80 page

MCP2221

DS20005292B-page 36

 2015 Microchip Technology Inc.

GP3 Power-Up Settings

Bit 7-5:

Don’t care

Bit 4: GPIO Output value

When GP3 is set as an output GPIO, this value will be

present at the GP2 pin at Power-Up/Reset.

Bit 3: GPIO Direction

(Input/Output) – Works only when

GP3 is set for GPIO operation.

GPIO Input mode

GPIO Output mode

Bit 2-0: GP3 Designation

111-100

Don’t care

011

Alternate function 1 (DAC2)

010

Alternate function 0 (ADC3)

001

Dedicated function operation (LED I2C)

000

GPIO operation

6-63

Don’t care

TABLE 3-14:

SUB-COMMAND STRUCTURE – WRITE USB MANUFACTURER DESCRIPTOR

STRING SUB-COMMAND

Byte Index

Value

Effect

0xB1

Write Flash Data – command code

0x02

Write USB Manufacturer Descriptor String – writes the USB

Manufacturer String Descriptor used during the USB enumeration

(2)

Number of bytes + 2 in the provided USB Serial Number Descriptor

String

0x03

The value at this index must always be 0x03.

4 + 2 x Unicode_char_number + 0(1)

Lower byte of the 16-bit Unicode character.

4 + 2 x Unicode_char_number + 1(1)

Higher byte of the 16-bit Unicode character.

Note 1:

“Unicode_char_number” value starts from 0 to a maximum of 30 (included).

The value at Byte Index 2 must be 2 + 2 x (number of Unicode characters in the string).

TABLE 3-15:

SUB-COMMAND STRUCTURE – WRITE USB PRODUCT DESCRIPTOR

STRING SUB-COMMAND

Byte Index

Value

Effect

0xB1

Write Flash Data – command code

0x03

Write USB Product Descriptor String – writes the USB Product

String Descriptor used during the USB enumeration

(2)

Number of bytes + 2 in the provided USB Serial Number Descriptor

String. The actual String starts at Byte Index 4.

0x03

The value at this index must always be 0x03.

4 + 2 x Unicode_char_number + 0(1)

Lower byte of the 16-bit Unicode character

4 + 2 x Unicode_char_number + 1(1)

Higher byte of the 16-bit Unicode character

Note 1:

“Unicode_char_number” value starts from 0 to a maximum of 30 (included).

The value at Byte Index 2 must be 2 + 2 x (number of Unicode characters in the string).

TABLE 3-13:

SUB-COMMAND STRUCTURE – WRITE GP SETTINGS SUB-COMMAND (CONTINUED)

Byte

Index

Function Description

Value

Effect

MCP2221 Datasheet(PDF) 36 Page - Microchip Technology

MCP2221 Datasheet(HTML) 36 Page - Microchip Technology

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80

Datasheet Download

Link URL