ADS1294CZXGR datasheet(29/114 Pages) TI2

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ADS1294, ADS1294R, ADS1296, ADS1296R, ADS1298, ADS1298R

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SBAS459K – JANUARY 2010 – REVISED AUGUST 2015

Feature Description (continued)

9.3.1.3.5

Supply Measurements (MVDDP, MVDDN)

Setting CHnSET[2:0] = 011 sets the channel inputs to different supply voltages of the device.

For channels 1, 2, 5, 6, 7, and 8, (MVDDP – MVDDN) = [0.5 × (AVDD – AVSS)]

For channels 3 and 4, (MVDDP – MVDDN) = DVDD / 4.

To avoid saturating the PGA while measuring power supplies, set the gain to 1.

For example, if AVDD = 2.5 V and AVSS = –2.5 V, then the measurement result is 2.5 V.

9.3.1.3.6

Lead-Off Excitation Signals (LoffP, LoffN)

The lead-off excitation signals are fed into the multiplexer before the switches. The comparators that detect the

lead-off condition are also connected to the multiplexer block before the switches. For a detailed description of

the lead-off block, refer to the Lead-Off Detection section.

9.3.1.3.7

Auxiliary Single-Ended Input

The RLD_IN pin is primarily used for routing the right leg drive (RLD) signal to any of the electrodes in case the

RLD electrode falls off. However, the RLD_IN pin can be used as a multiple single-ended input channel. The

signal at the RLD_IN pin can be measured with respect to the voltage at the RLD_REF pin using any of the eight

channels. This measurement is done by setting the channel multiplexer setting to 010, and the RLD_MEAS bit of

the CONFIG3 register to 1.

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ADS1294CZXGR Datasheet(PDF) 29 Page - Texas Instruments