ADS1294 datasheet(36/88 Pages) TI

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START

Opcode

(1)

RTPin

DIN

SETTLE

DRDY

STOP

Opcode

(1)

SDSU

DSHD

STOPOpcode

DRDY andDOUT

STARTPin

STOP(1)

ADS1294, ADS1294R

ADS1296, ADS1296R

ADS1298, ADS1298R

SBAS459H

– JANUARY 2010 – REVISED OCTOBER 2011

www.ti.com

Continuous Mode

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

Figure 41, 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 42 and Table 10 show the required timing of DRDY to the START pin and the START/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 41. Continuous Conversion Mode

(1)

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

Figure 42. START to DRDY Timing

Table 10. Timing Characteristics for Figure 42(1)

SYMBOL

DESCRIPTION

MIN

UNIT

START pin low or STOP opcode to DRDY setup time

tSDSU

1/fCLK

to halt further conversions

START pin low or STOP opcode to complete current

tDSHD

1/fCLK

conversion

(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 Link(s): ADS1294 ADS1294R ADS1296 ADS1296R ADS1298 ADS1298R

ADS1294 Datasheet(PDF) 36 Page - Texas Instruments

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