MCP2221 datasheet(28/80 Pages) MICROCHIP

28 / 80 page

MCP2221

DS20005292B-page 28

 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

DAC reference is VDD DAC voltage

DAC reference is VRM

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(1)

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)(1)

The requested mA value during the USB enumeration will

represent the value at this index multiplied by 2.

14-63 Don’t care

Note 1:

Please consult the USB 2.0 specification for details on the correct values for power and attributes

TABLE 3-5:

RESPONSE STRUCTURE – READ CHIP SETTINGS SUB-COMMAND (CONTINUED)

Byte

Index

Function Description

Value

Effect

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