ASD1194 datasheet(30/76 Pages) TI

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START

Opcode

(1)

RTPin

DIN

SETTLE

DRDY

STOP

Opcode

(1)

SDSU

DSHD

STOPOpcode

DRDY andDOUT

STARTPin

STOP(1)

ADS1194, ADS1196

ADS1198

SBAS471C

– APRIL 2010 – REVISED NOVEMBER 2011

www.ti.com

Continuous 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 32, 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 33 and Table 8 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 conversion results.

(1)

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

Figure 32. Continuous Conversion Mode

(1)

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

Figure 33. START to DRDY Timing

Table 8. Timing Characteristics for Figure 33(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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