ADS112U04IPWR datasheet(38/72 Pages) TI1

Part #	ADS112U04IPWR

Description	16-Bit, 4-Channel, 2-kSPS, Delta-Sigma ADC With UART Interface

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Manufacturer	TI1 [Texas Instruments]

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RX

TX

DATA LSB

DATA MSB

55h

RDATA

COUNTER

RX

TX

DATA MSB

55h

RDATA

DATA LSB

55h

RREG 2h

REGISTER 2h

DRDY

RX

TX

DATA LSB

DATA MSB

55h

RDATA

38

ADS112U04

SBAS838 – JANUARY 2018

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8.5.4.1 Manual Data Read Mode

In manual data read mode, data are read by issuing the RDATA command. The ADS112U04 responds to the

RDATA command with the latest conversion data. There are three ways to monitor for new conversion data.

One way is to monitor for the falling edge of the DRDY signal. To configure the GPIO2/DRDY pin to output the

DRDY signal, the pin must be configured as an output by setting the GPIO2DIR bit in the configuration register,

and DRDY must be multiplexed to the pin by setting the GPIO2SEL bit in the configuration register.

Figure 62 shows the timing diagram for collecting data in manual data read mode using DRDY to indicate new

data.

Figure 62. Manual Data Read Mode Using DRDY (Continuous Conversion Mode)

Another way to monitor for a new conversion result is to periodically read the DRDY bit in the configuration

register. If set, the DRDY bit indicates that a new conversion result is ready for retrieval. The host can

subsequently issue an RDATA command to retrieve the data. The rate at which the host polls the ADS112U04

for new data must be at least as fast as the data rate in continuous conversion mode to prevent the host from

missing a conversion result.

If a new conversion result becomes ready during a UART transmission, the transmission is not corrupted. The

new data are loaded into the output shift register upon the following RDATA command.

Figure 63 shows the timing diagram for collecting data in manual data read mode using the DRDY bit in the

configuration register to indicate new data.

Figure 63. Manual Data Read Mode Using the RREG Command (Continuous Conversion Mode)

The last way to detect if new conversion data are available is through the use of the conversion data counter

word. In this mode, the host periodically requests data from the device using the RDATA command and checks

the conversion data counter word against the conversion data counter word read for the previous data received.

If the counter values are the same, the host can disregard the data because that data has already been

gathered. If the counter has incremented, the host records the data. The rate at which the host polls the

ADS112U04 for new data must be at least as fast as the data rate in continuous conversion mode to prevent the

host from missing a conversion result.

If a new conversion result becomes ready during a UART transmission, the transmission is not corrupted. The

new data are loaded into the output shift register after the following RDATA command.

Figure 64 shows the timing diagram for collecting data in manual data read mode using the conversion data

counter word to indicate new data.

Figure 64. Manual Data Read Mode Using the Conversion Data Counter (Continuous Conversion Mode)

The conversion data counter can be used in conjunction with the previously discussed methods of detecting new

data to ensure that the host did not miss a conversion result.

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