MCP3919B datasheet(44/81 Pages) MICROCHIP

44 / 81 page

MCP3919B

DS20006995A-page 44

 2025 Microchip Technology Inc. and its subsidiaries

6.5.1

CONTINUOUS READ

The

STATUSCOM

contains

the

read

communication loop settings for the internal Register

Address Pointer (READ[1:0] bits). For continuous Read

modes, the address selection can take the following four

values:

Any SDI data coming after the control byte are not con-

sidered during a continuous read communication. The

following figures represent a typical, continuous read

communication on all six ADC channels in TYPES mode

with the default settings (DR_LINK = 1, READ[1:0] = 10,

WIDTH_DATA[1:0] = 01) in the case of 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 MCP3919B 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

DATA_CH1

24x

DATA_CH0

DATA_CH1

24x

Don’t care

DATA_CH0

<23>

New data

DATA_CH0

<23>

Old data

DATA_CH2

24x

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_CH2<0>

Complete READ sequence on new ADC

outputs channels 0 to 1

24x

DATA_CH2

MCP3919B データシート(PDF) 44 Page - Microchip Technology

MCP3919B データシート(HTML) 44 Page - Microchip Technology

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81

データシートダウンロード

リンク URL

MCP3919B データシート(PDF) 44 Page - Microchip Technology

MCP3919B データシート(HTML) 44 Page - Microchip Technology

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81

データシート ダウンロード

リンク URL

データシートダウンロード