ADS1291IRSMT datasheet(45/83 Pages) TI2

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SDSU

DSHD

STOPOpcode

DRDY andDOUT

STARTPin

STOP(1)

START

Opcode

(1)

RTPin

DIN

SETTLE

DRDY

STOP

Opcode

(1)

ADS1291, ADS1292, ADS1292R

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SBAS502C – DECEMBER 2011 – REVISED APRIL 2020

Product Folder Links: ADS1291 ADS1292 ADS1292R

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(1)

START and STOP commands take effect on the seventh SCLK falling edge at the end of the opcode transmission.

8.5.1.11 Continuous Mode

Conversions begin when the START pin is taken high or when the START opcode command is sent. As seen in

Figure 49, the DRDY output goes high when conversions are started and goes low when data are ready.

Conversions continue indefinitely until the START pin is taken low or the STOP opcode command is transmitted.

When the START pin is pulled low or the stop command is issued, the conversion in progress is allowed to

complete. Figure 50 and Table 14 show the required DRDY timing to the START pin and the START and STOP

opcode commands when controlling conversions in this mode. To keep the converter running continuously, the

START pin can be permanently tied high. Note that when switching from pulse mode to continuous mode, the

START signal is pulsed or a STOP command must be issued, followed by a START command. This conversion

mode is ideal for applications that require a fixed continuous stream of conversions results.

(1)

START and STOP opcode commands take effect on the seventh SCLK falling edge.

Figure 49. Continuous Conversion Mode

(1)

START and STOP commands take effect on the seventh SCLK falling edge at the end of the opcode transmission.

Figure 50. START to DRDY Timing

Table 14. Timing Characteristics for Figure 50(1)

PARAMETER

MIN

UNIT

tSDSU

START pin low or STOP opcode to DRDY setup time

to halt further conversions

tMOD

tDSHD

START pin low or STOP opcode to complete current

conversion

tMOD

ADS1291IRSMT Datasheet(PDF) 45 Page - Texas Instruments

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