COMBOSMARTMETER datasheet(29/60 Pages) TI1

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STOP Opcode

DRDY and DOUT

START Pin

STOP(1)

SDSU

DSHD

START(1)

Opcode

START Pin

DIN

tSETTLE

DRDY

STOP(1)

Opcode

ADS131E04

ADS131E06

ADS131E08

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SBAS561A – JUNE 2012 – REVISED APRIL 2013

Continuous Mode

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

Figure 34, the DRDY output goes high when conversions are started and then 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 35 and Table 8 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.

(1)

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

Figure 34. Continuous Conversion Mode

(1)

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

Figure 35. START to DRDY Timing

Table 8. Timing Characteristics for Figure 35(1)

SYMBOL

DESCRIPTION

MIN

UNIT

START pin low or STOP opcode to DRDY setup time

tSDSU

1/2 fMOD

to halt further conversions

START pin low or STOP opcode to complete current

tDSHD

1/2 fMOD

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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