MCP2221 datasheet(8/80 Pages) MICROCHIP

8 / 80 page

MCP2221

DS20005292B-page 8

 2015 Microchip Technology Inc.

CHIPSETTING1 REGISTER

R/W-0

R/W-1

R/W-0

R/W-1

R/W-0

—

CLKDC1

CLKDC0

CLKDIV2

CLKDIV1

CLKDIV0

bit 7

bit 0

Legend:

R = Readable bit

W = Writable bit

U = Unimplemented bit, read as ‘0’

-n = Value at POR

‘1’ = Bit is set

‘0’ = Bit is cleared

x = Bit is unknown

bit 7-5

Reserved: Set to ‘0’

bit 4-3

CLKDC<1:0>: Clock-Out Duty-Cycle

11 = Duty cycle 75% (75% of 1 clock period is logic ‘1’ and 25% of 1 clock period is logic ‘0’)

10 = Duty cycle 50% (50% of 1 clock period is logic ‘1’ and 50% of 1 clock period is logic ‘0’)

(factory default)

01 = Duty cycle 25% (25% of 1 clock period is logic ‘1’ and 75% of 1 clock period is logic ‘0’)

00 = Duty cycle 0% (100% of 1 clock period is logic ‘0’)

bit 2-0

CLKDIV<2:0>: Clock-Out Divider Output

111 = 375 kHz clock output

110 = 750 kHz clock output

101 = 1.5 MHz clock output

100 = 3 MHz clock output

011 = 6 MHz clock output

010 = 12 MHz clock output (factory default)

001 = 24 MHz clock output

000 =Reserved

CHIPSETTING2 REGISTER

R/W-1

R/W-0

R/W-1

R/W-0

DACVRM1

DACVRM0

DACREF

DACVAL4

DACVAL3

DACVAL2

DACVAL1

DACVAL0

bit 7

bit 0

Legend:

R = Readable bit

W = Writable bit

U = Unimplemented bit, read as ‘0’

-n = Value at POR

‘1’ = Bit is set

‘0’ = Bit is cleared

x = Bit is unknown

bit 7-6

DACVRM<1:0>: DAC Internal Voltage Reference (DAC VRM) Selection

11 = VRM voltage is 4.096V (only if VDD is above this voltage)

10 = VRM voltage is 2.048V (factory default)

01 = VRM voltage is 1.024V

00 = VRM is off

bit 5

DACREF: DAC Reference Output Selection

1 = DAC reference output is DAC VRM voltage selection

0 = DAC reference output is VDD (factory default)

bit 4-0

DACVAL<4:0>: Initial DAC Output Value

5-bit value for the DAC output (factory default is 8 decimal)

MCP2221 Datasheet(PDF) 8 Page - Microchip Technology

MCP2221 Datasheet(HTML) 8 Page - Microchip Technology

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