ADS1148IPWR datasheet(40/100 Pages) TI2

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DIN

0100 0010

0000 0001

MUX1

SYS0

Command

Data

Byte

Data

Byte

DIN

DOUT

VBIAS

00100001 00000001

1st

Command

Byte

2nd

Command

Byte

MUX1

DataByte

ADS1146, ADS1147, ADS1148

SBAS453G – JULY 2009 – REVISED AUGUST 2016

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Product Folder Links: ADS1146 ADS1147 ADS1148

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9.5.3.7 SDATAC (0001 011x)

The SDATAC command terminates read data continuous mode. In stop read data continuous mode, the

conversion result is not automatically loaded onto DOUT when DRDY goes low, and register read operations can

be performed without interruption from new conversion results being loaded into the output shift register. Use the

RDATA command to retrieve conversion data. The SDATAC command takes effect after the next DRDY.

If DRDY is not actively monitored for data conversions, the stop read data continuous mode is the preferred

method of reading data. In this mode, a read of ADC data is not interrupted by the completion of a new ADC

conversion.

9.5.3.8 RREG (0010 rrrr, 0000 nnnn)

The RREG command outputs the data from up to 15 registers, starting with the register address specified as part

of the instruction. The number of registers read is one plus the value of the second byte. If the count exceeds the

remaining registers, the addresses wrap back to the beginning. The two byte command structure for RREG is

listed below.

•

First Command Byte: 0010 rrrr, where rrrr is the address of the first register to read.

•

Second Command Byte: 0000 nnnn, where nnnn is the number of bytes to read –1.

•

Byte(s): data read from the registers are clocked out with NOPs.

It is not possible to use the full-duplex nature of the serial interface when reading out the register data. For

example, a SYNC command cannot be issued when reading out the VBIAS and MUX1 data, as shown in

Figure 52. Any command sent during the readout of the register data is ignored. Thus, TI recommends sending

NOPs through DIN when reading out the register data.

Figure 52. Read from Register

9.5.3.9 WREG (0100 rrrr, 0000 nnnn)

The WREG command writes to the registers, starting with the register specified as part of the instruction. The

number of registers that are written is one plus the value of the second byte. The command structure for WREG

is listed below.

•

First Command Byte: 0100 rrrr, where rrrr is the address of the first register to be written.

•

Second Command Byte: 0000 nnnn, where nnnn is the number of bytes to be written – 1.

•

Byte(s): data to be written to the registers.

Figure 53. Write to Register

ADS1148IPWR Datasheet(PDF) 40 Page - Texas Instruments

ADS1148IPWR Datasheet(HTML) 40 Page - Texas Instruments

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