MCP37D31-80ESLASHTE datasheet(82/141 Pages) MICROCHIP

82 / 141 page

 2020 Microchip Technology Inc.

DS20006382A-page 82

MCP37D31-80 AND MCP37D21-80

ADDRESS 0X00 – SPI BIT ORDERING AND ADC MODE SELECTION(1)

R/W-0

R/W-1

R/W-0

R/W-1

R/W-0

SHUTDOWN

LSb_FIRST

SOFT_RESET

STANDBY

SOFT_RESET

LSb_FIRST

SHUTDOWN

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

SHUTDOWN: Shutdown mode setting for power-saving(2)

1 =

ADC in Shutdown mode

0 = Not in Shutdown mode (Default)

bit 6

LSb_FIRST: Select SPI communication bit order

1 =

Start SPI communication with LSb first

0 = Start SPI communication with MSb first (Default)

bit 5

SOFT_RESET: Soft Reset control bit(3)

1 = Not in Soft Reset mode (Default)

0 = ADC in Soft Reset

bit 4

STANDBY: Send the device into a power-saving Standby mode(4)

1 =

ADC in Standby mode

0 =

Not in Standby mode (Default)

bit 3

STANDBY: Send the device into a power-saving Standby mode(4)

1 =

ADC in Standby mode

0 =

Not in Standby mode (Default)

bit 2

SOFT_RESET: Soft Reset control bit(3)

1 = Not in Soft Reset mode (Default)

0 = ADC in Soft Reset

bit 1

LSb_FIRST: Select SPI communication bit order

1 =

Start SPI communication with LSb first

0 =

Start SPI communication with MSb first (Default)

bit 0

SHUTDOWN: Shutdown mode setting for power-saving(2)

1 = ADC in Shutdown mode

0 = Not in Shutdown mode (Default)

Note

Upper and lower nibble are mirrored, which makes the MSb- or LSb-first mode interchangeable. The lower nibble (bit <3:0>)

has a higher priority when the mirrored bits have different values.

During Shutdown mode, most of the internal circuits including the reference and clock are turned-off except for the SPI

interface. When exiting from Shutdown (changing from ‘1’ to ‘0’), executing the device Soft Reset simultaneously is highly

recommended for a fast recalibration of the ADC. The internal user registers are not affected.

This bit forces the device into Soft Reset mode, which initializes the internal calibration registers to their initial default states.

The user-registers are not affected. When exiting Soft Reset mode (changing from ‘0’ to ‘1’), the device performs an automatic

device calibration including PLL calibration if PLL is enabled. DLL is reset if enabled. During Soft Reset, the device has the

following states:

- no ADC output

- no change in power-on condition of internal reference

- most of the internal clocks are not distributed

- power consumption: (a) digital section - negligible, (b) analog section - no change

During Standby mode, most of the internal circuits are turned off except for the reference, clock and SPI interface. When exiting

from Standby mode (changing from ‘1’ to ‘0’) after an extended amount of time, executing Soft Reset simultaneously is highly

recommended. The internal user registers are not affected.

MCP37D31-80E/TE Datasheet(PDF) 82 Page - Microchip Technology

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