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ADS1299 Datasheet(PDF) 52 Page - Texas Instruments |
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ADS1299 Datasheet(HTML) 52 Page - Texas Instruments |
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52 / 66 page  51 kW 47 nF Skin, Electrode Contact Model Patient Protection Resistor BIAS_STAT Patient AVSS BIAS_SENS To ADC input (through V connection to any of the channels). REF ILGND_OFF[1:0] ADS1299 SBAS499A – JULY 2012 – REVISED AUGUST 2012 www.ti.com BIAS LEAD-OFF The ADS1299 provides two modes for determining whether the BIAS is correctly connected: • BIAS lead-off detection during normal operation • BIAS lead-off detection during power-up The following sections provide details of the two modes of operation. BIAS Lead-Off Detection During Normal Operation During normal operation, the ADS1299 BIAS lead-off at power-up function cannot be used because it is necessary to power off the BIAS amplifier. BIAS Lead Off Detection At Power-Up This feature is included in the ADS1299 for use in determining whether the bias electrode is suitably connected. At power-up, the ADS1299 provides two measurement procedures to determine the BIAS electrode connection status using either a current or an external pull-down resistor, as shown in Figure 50. The reference level of the comparator is set to determine the acceptable BIAS impedance threshold. Figure 50. BIAS Lead-Off Detection at Power-Up When the BIAS amplifier is powered on, the current source has no function. Only the comparator can be used to sense the voltage at the output of the BIAS amplifier. The comparator thresholds are set by the same LOFF[7:5] bits used to set the thresholds for other negative inputs. 52 Submit Documentation Feedback Copyright © 2012, Texas Instruments Incorporated Product Folder Link(s): ADS1299 |
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