MCP2210 datasheet(29/82 Pages) MICROCHIP

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 2011 Microchip Technology Inc.

DS22288A-page 29

MCP2210

3.1.8

GET USB KEY PARAMETERS

3.1.8.1

Responses

FIGURE 3-8:

GET USB KEY PARAMETERS LOGIC FLOW

TABLE 3-21:

COMMAND STRUCTURE

Byte

Index

Meaning

00x61 – Get NVRAM Settings – command code

10x30 – Get USB Key Parameters – sub-command code

20x00 – Reserved

3-63

0x00 – Reserved

TABLE 3-22:

RESPONSE 1 STRUCTURE

Byte

Index

Meaning

0x61 – Get NVRAM Settings – echos back the given command code

0x00 – Command Completed Successfully

0x30 – Sub-command Echoed Back for Get USB Key Parameters code

3-11

Don’t care

VID low byte

VID high byte

PID low byte

PID high byte

16-28

Don’t care

Chip Power Option (as per USB specs – Chapter 9)

• Bit 7 – Host Powered

• Bit 6 – Self Powered

• Bit 5 – Remote Wake-up Capable

• Bit 4 – Don’t Care

• Bit 3 – Don’t Care

• Bit 2 – Don’t Care

• Bit 1 – Don’t Care

• Bit 0 – Don’t Care

Requested Current Amount from USB Host (quanta of 2 mA)

Example: For 100 mA this byte index will have a value of 50 (in decimal) or 0x32.

31-63

Don’t Care

Get NVRAM USB

Key Parameters

Response 1

NVRAM USB

Key Parameters

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