Datasheet

MCP2221
DS20005292A-page 54  2014 Microchip Technology Inc.
6 Bit 7-6: DAC Reference voltage option 11
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 DAC uses other reference than VRM DAC;
e.g., V
DD)
Bit 5: DAC reference option 1 DAC reference is VRM DAC voltage
0 DAC reference is V
DD
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 neg-
ative edge occurs.
Bit 5: Interrupt detection – positive edge If set, the interrupt detection flag will be set when a pos-
itive 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 DAC;
e.g., V
DD)
Bit 2: ADC Reference Option 1 ADC reference is V
RM ADC
0 ADC reference is VDD
Bit 1 Don’t
care
Bit 2 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 Config-
uration 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 Current supplied-password byte 1
15 Current supplied-password byte 2
16 Current supplied-password byte 3
17 Current supplied-password byte 4
18 Current supplied-password byte 5
19 Current supplied-password byte 6
20 Current supplied-password byte 7
21 Current supplied-password byte 8
TABLE 3-39: RESPONSE 1 STRUCTURE (CONTINUED)
Byte
Index
Function Description Value Effect