ADS1258IPHPREP datasheet(40/57 Pages) TI

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ADS1258-EP

SBAS445C – MARCH 2009 – REVISED DECEMBER 2009

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Bit 3

CLKENB

This bit enables the clock output on pin CLKIO. The clock output originates from the device crystal

oscillator and PLL circuit.

0 = Clock output on CLKIO disabled.

1 = Clock output on CLKIO enabled (default).

Note: If the CLKSEL pin is set to '1', the CLKIO pin is a clock input only. In this case, setting this bit

has no effect.

Bit 2

CHOP

This bit enables the chopping feature on the external multiplexer loop.

0 = Chopping Disabled (default)

1 = Chopping Enabled

The chopping feature corrects for offset originating from components used in the external multiplexer

loop; see the External Chopping section.

Note that for Internal System readings (Temperature, VCC, Gain, and Reference), the CHOP bit must

be 0.

Bit 1

STAT Status Byte Enable

When reading channel data from the ADS1258, a status byte is normally included with the conversion

data. However, in some ADS1258 operating modes, the status byte can be disabled. Table 13, Status

Byte, shows the modes of operation and the data read formats in which the status byte can be

disabled.

0 = Status Byte Disabled

1 = Status Byte Enabled (default)

Table 13. Status Byte

CHANNEL DATA

MODE

READ COMMAND

READ DIRECT

Auto-Scan

Always Enabled

Enabled/Disabled by STAT Bit

Fixed-Channel

Always Enabled (Byte is Undefined)

Always Disabled

Bit 0

Must be 0

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