MCP3910 datasheet(49/90 Pages) MICROCHIP

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DS20005116D-page 49

MCP3910

6.5.1

CONTINUOUS READ

The STATUSCOM register contains the loop settings for

the Internal Register Address Pointer (READ[1:0] bits

and WRITE bit). For the Continuous Read modes, the

address selection can take the four following values:

No SDI data coming after the control byte are considered

during a continuous read communication. The following

figures represent a typical, continuous read communi-

cation with the default settings (DR_LINK = 1,

READ[1:0] = 10, WIDTH_DATA[1:0] = 01) for SPI

Mode 0,0 (Figure 6-7) and SPI Mode 1,1 (Figure 6-8).

In SPI Mode (1,1), the SDO pin stays in the last state

(LSB of previous data) after a complete reading, which

also allows seamless Continuous Read mode (see

Figure 6-8).

FIGURE 6-7:

Typical Continuous Read Communication (WIDTH_DATA[1:0] = 01, SPI Mode 0,0).

FIGURE 6-8:

Typical Continuous Read Communication (WIDTH_DATA[1:0] = 01, SPI Mode 1,1).

TABLE 6-1:

ADDRESS SELECTION IN

CONTINUOUS READ

READ[1:0]

for Continuous Read

Communications

Static (no incrementation)

Groups

Types (default)

Full Register Map

Note:

For continuous reading of ADC data in

SPI Mode 0,0 (see Figure 6-7), once the

data have been completely read after a

data ready, the SDO pin will take the MSB

value of the previous data at the end of the

reading (falling edge of the last SCK

clock). If SCK stays Idle at logic low (by

definition of Mode 0,0), the SDO pin will

be updated at the falling edge of the next

data ready pulse (synchronously with the

DR pin falling edge with an output timing

of tDODR) with the new MSB of the data

corresponding to the data ready pulse.

This mechanism allows the MCP3910 to

continuously read ADC data outputs

seamlessly, even in SPI Mode (0,0).

Don’t care

SCK

SDI

SDO

Hi-Z

0x01

24x

DATA_CH0

Starts read sequence at

address 00000

Complete READ sequence on ADC

outputs channels 0 to 1

DATA_CH1

24x

DATA_CH0

DATA_CH1

24x

Don’t care

Stays at

DATA_CH1<0>

Complete READ sequence on new ADC

outputs channels 0 to 1

High Z

Don’t care

SCK

SDI

SDO

Hi-Z

0x01

24x

DATA_CH0

Starts read sequence at

address 00000

DATA_CH1

24x

DATA_CH0

DATA_CH1

24x

Don’t care

DATA_CH0

<23>

New data

DATA_CH0

<23>

Old data

High Z

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