ASD1194 datasheet(36/76 Pages) TI

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START

DRDY

SCLK

DIN

UPDATE

DOUT

Hi-Z

RDATACOpcode

StatusRegister+8-ChannelData(152Bits)

NextData

ADS1194, ADS1196

ADS1198

SBAS471C

– APRIL 2010 – REVISED NOVEMBER 2011

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STOP: Stop Conversions

This opcode stops conversions. Tie the START pin low to control conversions by command. When the STOP

command is sent, the conversion in progress completes and further conversions are stopped. If conversions are

already stopped, this command has no effect. There are no restrictions on the SCLK rate for this command and it

can be issued any time.

RDATAC: Read Data Continuous

This opcode enables the output of conversion data on each DRDY without the need to issue subsequent read

data opcodes. This mode places the conversion data in the output register and may be shifted out directly. The

read data continuous mode is the default mode of the device and the device defaults in this mode on power-up.

RDATAC mode is cancelled by the Stop Read Data Continuous command. If the device is in RDATAC mode, a

SDATAC command must be issued before any other commands can be sent to the device. There is no

restriction on the SCLK rate for this command. However, the subsequent data retrieval SCLKs or the SDATAC

opcode command should wait at least 4 CLK cycles. The timing for RDATAC is shown in Figure 38. As Figure 38

shows, there is a keep out zone of 4 CLK cycles around the DRDY pulse where this command cannot be issued

in. If no data are retrieved from the device, DOUT and DRDY behave similarly in this mode. To retrieve data from

the device after RDATAC command is issued, make sure either the START pin is high or the START command

is issued. Figure 38 shows the recommended way to use the RDATAC command. RDATAC is ideally suited for

applications such as data loggers or recorders where registers are set once and do not need to be re-configured.

(1)

tUPDATE = 4/fCLK. Do not read data during this time.

Figure 38. RDATAC Usage

SDATAC: Stop Read Data Continuous

This opcode cancels the Read Data Continuous mode. There is no restriction on the SCLK rate for this

command, but the following command must wait for 4 CLK cycles.

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Product Folder Link(s): ADS1194 ADS1196 ADS1198

ASD1194 Datasheet(PDF) 36 Page - Texas Instruments