MCP2221 datasheet(34/80 Pages) MICROCHIP

34 / 80 page

MCP2221

DS20005292B-page 34

 2015 Microchip Technology Inc.

Bit 7

Don’t

care

Bit 6: Interrupt detection –

negative edge

If set, the interrupt detection flag will be set when a negative

edge occurs.

Bit 5: Interrupt detection –

positive edge

If set, the interrupt detection flag will be set when a positive edge

occurs.

Bit 4-3: ADC Reference Voltage

Reference voltage is 4.096V (only if VDD is above this voltage).

Reference voltage is 2.048V

Reference voltage is 1.024V

Reference voltage is off (this is useful for the case in which the

ADC uses other reference than VRM ADC; e.g., VDD)

Bit 2: ADC Reference Option

ADC reference voltage is VRM ADC

ADC reference voltage is VDD

Bit 1

Don’t

care

Bit 0

Don’t

care

Lower byte of the 16-bit USB VID

value.

Higher byte of the 16-bit USB

VID value.

Lower byte of the 16-bit USB PID

value.

Higher byte of the 16-bit USB

PID value.

USB power attributes

This value will be used by the MCP2221’s USB Configuration

Descriptor (power attributes value) during the USB enumeration.

USB requested number of mA(s)

The requested mA value during the USB enumeration will

represent the value at this index multiplied by 2.

12-19 8-bytes password (for Flash

modifications protection)

20-63

Don’t

care

TABLE 3-12:

SUB-COMMAND STRUCTURE – WRITE CHIP SETTINGS SUB-COMMAND

Byte

Index

Function Description

Value

Effect

MCP2221 数据表(PDF) 34 Page - Microchip Technology

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