MCP2221 datasheet(54/80 Pages) MICROCHIP

54 / 80 page

MCP2221

DS20005292B-page 54

 2015 Microchip Technology Inc.

5Bit 7-5

Don’t

care

Bit 4-0: Clock Output divider value

If the GP pin (exposing the clock output) is enabled for

clock output operation, the divider value will be used on

the 48 MHz USB internal clock and its divided output

will be sent to this pin. (Bits 4-3 for duty cycle and bits

2-0 for the clock divider.)

Bit 7-6: DAC Reference voltage option

Reference voltage is 4.096V

Reference voltage is 2.048V

Reference voltage is 1.024V

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

which the DAC uses other reference than VRM DAC;

e.g., VDD)

Bit 5: DAC reference option

DAC reference is VRM DAC voltage

DAC reference is VDD

Bit 4-0: Power-Up DAC value

7Bit 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 DAC;

e.g., VDD)

Bit 2: ADC Reference Option

ADC reference is VRM ADC

ADC reference is VDD

Bit 1

Don’t

care

Bit 2

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

Current supplied-password byte 1

Current supplied-password byte 2

Current supplied-password byte 3

TABLE 3-39:

RESPONSE 1 STRUCTURE (CONTINUED)

Byte

Index

Function Description

Value

Effect

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