ADS1258IPHPREP datasheet(39/59 Pages) TI1

39 / 59 page

ADS1258-EP

www.ti.com

SBAS445D

– MARCH 2009 – REVISED MARCH 2011

CONFIG1: CONFIGURATION REGISTER 1 (Address = 01h)

IDLMOD

DLY2

DLY1

DLY0

SBCS1

SBCS0

DRATE1

DRATE0

Default = 83h.

Bit 7

IDLMOD

This bit selects the Idle mode when the device is not converting, Standby or Sleep. The Sleep mode

offers lower power consumption but has a longer wake-up time to re-enter the run mode; see the Idle

Modes section.

0 = Select Standby Mode

1 = Select Sleep Mode (default)

Bits

DLY[2:0]

–4

These bits set the amount of time the converter will delay after indexing to a new channel but before

starting a new conversion. This value should be set large enough to allow for the full settling of

external filtering or buffering circuits used between the MUXOUTP, MUXOUTN, and ADCINP,

ADCINN pins; see the Switch Time Delay section. (default = 000)

Bits

SBCS[1:0]

–2

These bits set the sensor bias current source.

0 = Sensor Bias Current Source Off (default)

1 = 1.5

µA Source

3 = 24

µA Source

Bits

DRATE[1:0]

–0

These bits set the data rate of the converter. Slower reading rates yield increased resolution; see

Table 4. The actual data rates shown in the table can be slower, depending on the use of Switch Time

Delay or the Chop feature. See the Switch Time Delay section. The reading rate scales with the

master clock frequency.

DATA RATE

AUTO-SCAN MODE

FIXED-CHANNEL MODE

DRATE[1:0]

(SPS)

23739

125000

15123

31250

6168

7813

1831

1953

fCLK = 16MHz, Chop = 0, Delay = 0.

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