Datasheet

MCP2221

DS20005292A-page 28  2014 Microchip Technology Inc.

7 Bit 7 Don’t

care

Bit 6: Interrupt detection – nega-

tive 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 11 Reference voltage is 4.096V (only if V

DD is above this

voltage)

10 Reference voltage is 2.048V

01 Reference voltage is 1.024V

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

the ADC uses other reference than V

RM ADC; e.g., VDD)

Bit 2 1 DAC reference is VDD DAC voltage

0 DAC reference is V

Bit 1 Don’t

care

Bit 0 Don’t

care

8 Lower byte of the 16-bit USB VID

value

9 Higher byte of the 16-bit USB VID

value

10 Lower byte of the 16-bit USB PID

value

11 Higher byte of the 16-bit USB PID

value

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

Descriptor (power attributes value) during the USB

enumeration.

13 USB requested number of mA(s) The requested mA value during the USB enumeration will

represent the value at this index multiplied by 2.

14-63 Don’t care

TABLE 3-5: RESPONSE STRUCTURE – READ CHIP SETTINGS SUB-COMMAND (CONTINUED)

Byte

Index

Function Description Value Effect