MCP3565R datasheet(58/108 Pages) MICROCHIP

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MCP3565R

DS20006401C-page 58



2020-2021 Microchip Technology Inc.

5.14.2

CONVERSION MODES IN SCAN

MODE

In Scan mode, the device takes one conversion per

channel and multiplexes the input to the next channel

in the Scan sequence. Therefore, all conversions are

One-Shot mode conversions, no matter how the

CONV_MODE[1:0] bits are set. Each conversion takes

the same time, TCONV (or 2 x TCONV when AZ_MUX = 1;

see

Section 5.1.3 “ADC Offset Cancellation Algo-

rithm”), to be performed. If CONV_MODE[1:0] = 00,

01 or 10, the Scan cycle is executed once and then the

ADC is placed into Standby or ADC Shutdown mode.

If CONV_MODE[1:0] = 11, the ADC runs in a Scan

Cycle mode with a TIMER[23:0] delay between cycles.

Writing the CONV_MODE[1:0] bits with the SPI inter-

face within a conversion does not create an internal

reset. It is recommended not to wait for the end of a

conversion to change the CONV_MODE[1:0] bits to the

desired value, but to change to the desired value just

after the data are ready to avoid possible glitches.

Figure 5-16 and Figure 5-17, respectively, detail the

ADC timing behavior in One-Shot and Continuous

Conversion modes when configured for Scan mode,

with N channels chosen among 16 Scan possibilities.

FIGURE 5-16:

SCAN One-Shot Conversion Mode Timing Diagram.

FIGURE 5-17:

SCAN Continuous Conversion Mode Timing Diagram.

0X or 10

Depending on CONV_MO DE

Write

CONV_MODE = 0X/10

SPI

Write

ADC_MODE = 11

MCLK

ADC_MODE

TADC_SETUP

TCONV

Read ADC Dat a 1

TDLY_SCA N

Continuous clocking

Don’t care

Shutdown or Reset

Depending on CONV_MO DE

Shutdown

ADC STATUS

Reset

Channel 1 Conversion

Start-up

TCONV

Reset

Channel 2 Conversion

TDLY_SCAN

Channel N Conversion

(Last in Cycle)

TCONV

Read ADC Data N-1

Read ADC Dat a N

Write

CONV_MODE = 11

SPI

Write

ADC_MODE = 11

MCLK

ADC_MODE

TADC_SETUP

TCONV

Read ADC Data 1

TDLY_SCAN

Continuous clocking

Don’t care

Shutdown or Reset

Depending onTIMER[23:0] settings

Shutdown

ADC STATUS

Reset

Channel 1 Conversion

Start-up

TCONV

Reset

Channel 2 Conversion

TDLY_SCAN

Channel N Conversion

(Last in Cycle)

TCONV

Read ADC Data N-1

Read ADC Data N

Start-up

Reset

Channel 1 Conversion

(New Cycle)

TADC_SETUP

Channel 2 Conversion

(New Cycle)

Read ADC Data1

(New Cycle)

TCONV

TDLY_SCAN

TTIMER _SCAN

Start‐Up time is reduced to 0 if

TTIMER_SCAN < 256 DMCLK periods

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