ADS1294CZXGR datasheet(55/114 Pages) TI2

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SDSU

DSHD

STOPOpcode

DRDY andDOUT

STARTPin

STOP(1)

START

Opcode

(1)

RTPin

DIN

SETTLE

DRDY

STOP

Opcode

(1)

ADS1294, ADS1294R, ADS1296, ADS1296R, ADS1298, ADS1298R

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SBAS459K – JANUARY 2010 – REVISED AUGUST 2015

9.4.1.5 Continuous Conversion Mode

Conversions begin when the START pin is taken high for at least two tCLKs, or when the START opcode

command is sent. As seen in Figure 63, 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 64 and Table 14 show the required timing of DRDY to the START pin

and the START and STOP opcode commands when controlling conversions in this mode. To keep the converter

running continuously, permanently tie the START pin high. When switching from single-shot mode to continous-

conversion mode, pulse the START signal or a issue a STOP command followed by a START command. This

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

(1)

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

Figure 63. Continuous Conversion Mode

(1)

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

Figure 64. START to DRDY Timing

Table 14. Timing Requirements for Figure 64 (1)

MIN

MAX

UNIT

tSDSU

START pin low or STOP opcode to DRDY setup time to halt further conversions

tCLK

tDSHD

START pin low or STOP opcode to complete current conversion

tCLK

(1)

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

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Product Folder Links: ADS1294 ADS1294R ADS1296 ADS1296R ADS1298 ADS1298R

ADS1294CZXGR Datasheet(PDF) 55 Page - Texas Instruments

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