MCP2221AT-ISLASHST datasheet(8/80 Pages) MICROCHIP

8 / 80 page

MCP2221A

DS20005565A-page 8

 2016 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 bits

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

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

(factory default)

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

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

bit 2-0

CLKDIV<2:0>:

Clock-Out Divider Output bits

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 bits

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

= VRM voltage is 2.048V (factory default)

= VRM voltage is 1.024V

= VRM is off

bit 5

DACREF:

DAC Reference Output Selection bit

= DAC reference output is DAC VRM voltage selection

= DAC reference output is VDD (factory default)

bit 4-0

DACVAL<4:0>:

Initial DAC Output Value bit

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

MCP2221AT-I/ST Datasheet(PDF) 8 Page - Microchip Technology

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