ADS1283IRHFR.B datasheet(39/67 Pages) TI2

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SCLK

DOUT

(2)

Don't Care

Data Byte 1 (MSB)

Date Byte 4 (LSB)

11 12 13

36 37

39 40

DIN

Command Byte (0001 0010)

DDPD

DRDY

(1)

11 12 13

25 26

28 29

31 32

SCLK

DOUT

(2)

Data Byte 1 (MSB)

Data Byte 2 (MSB - 1)

Data Byte 4 (LSB)

DIN

DDPD

(1)

DRDY

ADS1283

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SBAS565C – JANUARY 2014 – REVISED AUGUST 2019

Product Folder Links: ADS1283

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(1)

DOUT is in tristate when CS is high. Load on DOUT = 20 pF || 100 k

Ω.

8.4.8 Reading Data

The ADS1283 provides two modes to read conversion data: read-data-continuous and read-data-by-command.

8.4.8.1 Read-Data-Continuous Mode

In the read-data-continuous mode, the conversion data are shifted out directly from the device without the need

for sending a read command. This mode is the default mode at power-on. This mode is also enabled by the

RDATAC command. When DRDY goes low, indicating that new data are available, the MSB of data appears on

DOUT, as shown in Figure 53. The data are normally read on the rising edge of SCLK, at the occurrence of the

first falling edge of SCLK, DRDY returns high. After 32 bits of data have been shifted out, further SCLK

transitions cause DOUT to go low. If desired, the read operation may be stopped at 24 bits. The data shift

operation must be completed within four CLK periods before DRDY falls again or the data may be corrupted.

When a SDATAC command is issued, the DRDY output is blocked but the ADS1283 continues conversions. In

stop continuous mode, the data can only be read by command.

(1)

DOUT is in tristate when CS is high. CS can be tied low. See Figure 1 for CS low to valid DOUT propagation time.

Figure 53. Read Data Continuous

Table 17. Timing Data for Figure 53

PARAMETER

MIN

TYP

MAX

UNIT

tDDPD

DRDY to valid MSB on DOUT propagation delay(1)

100

8.4.8.2 Read-Data-By-Command Mode

Read-data-continuous mode is stopped by the SDATAC command and put into read-data-by-command mode. In

read-data-by-command mode, an RDATA command must be sent to the device for each data conversion (as

shown in Figure 54). When the read data command is received (on the eighth SCLK rising edge), data are

available to read only when DRDY goes low (tDR). When DRDY goes low, conversion data appear on DOUT. The

data may be read on the rising edge of SCLK.

(1)

DOUT is in tristate when CS is high.CS can be tied low. See Figure 1 for CS low to SCLK rising edge time.

Figure 54. Read Data By Command, RDATA (tDDPD timing is given in Table 17)

Table 18. Read Data Timing for Figure 54

PARAMETER

DESCRIPTION

MIN

TYP

MAX

UNIT

tDR

Time for new data after data read command

fDATA

ADS1283IRHFR.B Datasheet(PDF) 39 Page - Texas Instruments

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