ADS1148IPWR datasheet(39/100 Pages) TI2

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DIN

DOUT

DRDY

RDATAC

SCLK

16Bits

NOP

0001010X

SCLK

DOUT

DIN

DRDY

NOP

RDATA

NOP

D[15]

D[6]

D[1]

D[0]

D[9]

D[8]

D[7]

D[14]

D[15] D[14]

D[0]

SCLK

DIN

DOUT

DRDY

MSB

0001001X

LSB

NOP

RDATA

ADS1146, ADS1147, ADS1148

www.ti.com

SBAS453G – JULY 2009 – REVISED AUGUST 2016

Product Folder Links: ADS1146 ADS1147 ADS1148

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9.5.3.5 RDATA (0001 001x)

The RDATA command loads the most recent conversion result into the output register. After issuing this

command, the conversion result is read out by sending 16 SCLKs, as shown in Figure 49. This command also

works in RDATAC mode.

Figure 49. Figure Read Data Once

When performing multiple reads of the conversion result, the RDATA command can be sent when the last eight

bits of the conversion result are being shifted out during the course of the first read operation by taking

advantage of the duplex communication nature of the serial interface, as shown in Figure 50.

Figure 50. Using RDATA in Full-Duplex Mode

9.5.3.6 RDATAC (0001 010x)

The RDATAC command enables read data continuous mode. This is the default mode after a power up or reset.

In read data continuous mode, new conversion results are automatically loaded onto DOUT. The conversion

result can be received from the device after the DRDY signal goes low by sending 16 SCLKs. It is not necessary

to read back all the bits, as long as the number of bits read out is a multiple of eight. The RDATAC command

must be issued after DRDY goes low, and the command takes effect on the next DRDY as shown in Figure 51.

Be sure to complete data retrieval (conversion result or register read-back) before DRDY returns low, or the

resulting data is corrupted. Successful register read operations in RDATAC mode require the knowledge of when

the next DRDY falling edge occurs.

Figure 51. Read Data Continuously

ADS1148IPWR Datasheet(PDF) 39 Page - Texas Instruments

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