MCP2221 datasheet(49/80 Pages) MICROCHIP

49 / 80 page

 2015 Microchip Technology Inc.

DS20005292B-page 49

MCP2221

3.1.13

SET SRAM SETTINGS

This command is used to alter various run time

chip-settings. The altered settings reside in SRAM

memory

and

they

won’t

affect

the

chip’s

Power-Up/Reset default settings. These altered

settings will be active till the next chip Power-Up/Reset.

TABLE 3-36:

COMMAND STRUCTURE

Byte

Index

Function Description

Value

Effect

0x60

Set SRAM settings – command code

1Don’t

care

Clock Output Divider value – this allows the user to modify the clock output value on the fly, at run-time

Bit 7: Enable loading of a

new clock divider

The 4-0 bits will be loaded into the clock divider

Clock divider value won’t be altered

Bit 6-5

Don’t

care

Bit 4-3: Duty cycle

0% duty cycle

25% duty cycle

50% duty cycle

75% duty cycle

Bit 2-0: Clock divider

value

DAC Voltage Reference – this allows the user to modify the DAC reference voltage

Bit 7: Enable loading of a

new DAC reference

Bits 2-0 will be used for DAC reference voltage selection

DAC reference will remain unaltered

Bit 6-3

Don’t

care

Bit 2-1: DAC VRM voltage

selection. These bits are

used to change the DAC

VRM voltage

VRM voltage is 4.096V (only if VDD is higher than this value)

VRM voltage is 2.048V

VRM voltage is 1.024V

VRM voltage is off

Bit 0: This bit is used to

change the DAC

reference voltage

DAC voltage reference is the internal DAC voltage reference module

(DAC VRM)

DAC voltage reference is VDD

Set DAC output value

Bit 7: Enable loading of a

new DAC value

Bits 4-0 will be used for DAC reference voltage selection

The current DAC value will remain unaltered

Bit 6-5

Don’t

care

Bit 4-0: The new DAC

value

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