MCP2221 datasheet(27/80 Pages) MICROCHIP

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 2015 Microchip Technology Inc.

DS20005292B-page 27

MCP2221

TABLE 3-5:

RESPONSE STRUCTURE – READ CHIP SETTINGS SUB-COMMAND

Byte

Index

Function Description

Value

Effect

0xB0

Read Flash Data – command code echo

0x00

Command completed successfully

Structure length

3Don’t care

Bit 7: CDC Serial Number

Enumeration Enable

The USB serial number will be used during the USB

enumeration of the CDC interface.

No serial number descriptor will be presented during the

USB enumeration.

Bit 6: Initial value for LEDUARTRX

pin option

This value represents the logic level signaled when no

UART RX activity takes places. When the UART RX (of the

MCP2221) is receiving data, the LEDUARTRX pin will take

the negated value of this bit.

Bit 5: Initial value for LEDUARTTX

pin option

This value represents the logic level signaled when no

UART TX transmission takes place. When the UART TX (of

the MCP2221) is sending data, the LEDUARTTX pin will

take the negated value of this bit.

Bit 4: Initial value for LEDI2C pin

option

This value represents the logic level signaled when no I2C

traffic occurs. When the I2C traffic is active, the LEDI2C pin

(if enabled) will take the negated value of this bit.

Bit 3: Initial value for SSPND pin

option

This value represents the logic level signaled when the

device is not in Suspend mode. Upon entering Suspend

mode, the SSPND pin (if enabled) will take the negated

value of this bit.

Bit 2: Initial value for USBCFG pin

option

This value represents the logic level signaled when the

device is not USB configured. When the device will be USB

configured, the USBCFG pin (if enabled) will take the

negated value of this bit.

Bits 1-0: Chip configuration security

option

11-10

Permanently locked

Password-protected

Unsecured

Bits 7-5

Don’t

care

Bits 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 7-6: DAC Reference voltage

option

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 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

Bits 4-0: Power-Up DAC value

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