Datasheet

ADS1258-EP

SBAS445D –MARCH 2009– REVISED MARCH 2011

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MUXSCH: MULTIPLEXER FIXED-CHANNEL REGISTER (Address = 02h)

7 6 5 4 3 2 1 0

AINP3 AINP2 AINP1 AINP0 AINN3 AINN2 AINN1 AINN0

Default = 00h.

This register selects the input channels of the multiplexer to be used for the Fixed-Channel mode. The MUXMOD

bit in register CONFIG0 must be set to '1'. In this mode, bits AINN[3:0] select the analog input channel for the

negative ADC input, and bits AINP[3:0] select the analog input channel for the positive ADC input. See the

Fixed-Channel Mode section.

MUXDIF: MULTIPLEXER DIFFERENTIAL INPUT SELECT REGISTER (Address = 03h)

7 6 5 4 3 2 1 0

DIFF7 DIFF6 DIFF5 DIFF4 DIFF3 DIFF2 DIFF1 DIFF0

Default = 00h.

MUXSG0: MULTIPLEXER SINGLE-ENDED INPUT SELECT REGISTER 0 (Address = 04h)

7 6 5 4 3 2 1 0

AIN7 AIN6 AIN5 AIN4 AIN3 AIN2 AIN1 AIN0

Default = FFh.

MUXSG1: MULTIPLEXER SINGLE-ENDED INPUT SELECT REGISTER 1 (Address = 05h)

7 6 5 4 3 2 1 0

AIN15 AIN14 AIN13 AIN12 AIN11 AIN10 AIN9 AIN8

Default = FFh.

SYSRED: SYSTEM READING SELECT REGISTER (Address = 06h)

7 6 5 4 3 2 1 0

0 0 REF GAIN TEMP VCC 0 OFFSET

Default = 00h.

These four registers select the input channels and the internal readings for measurement in Auto-Scan mode.

For differential channel selections (DIFF0…DIFF7), adjacent input pins (AIN0/AIN1, AIN2/AIN3, etc.) are pre-set

as differential inputs. All single-ended inputs are measured with respect to the AINCOM input. AINCOM may be

set to any level within ±100 mV of the analog supply range. Channels not selected are skipped in the

measurement sequence. Writing to any of these four registers resets the internal channel pointer to the channel

with the highest priority (see Table 11). Note that the bits indicated as '0' must be set to 0.

0 = Channel not selected within a reading sequence.

1 = Channel selected within a reading sequence.

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