ADS1299
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SBAS499A –JULY 2012–REVISED AUGUST 2012
Lead-Off
Sample code to set dc lead-off with pull-up and pull-down resistors on all channels.
WREG LOFF 00h // Comparator threshold at 95% and 5%, pull-up or pull-down current source // DC lead-off
WREG CONFIG4 02h // Turn-on dc lead-off comparators
WREG LOFF_SENSP FFh // Turn on the P-side of all channels for lead-off sensing
WREG LOFF_SENSN FFh // Turn on the N-side of all channels for lead-off sensing
Observe the status bits of the output data stream to monitor lead-off status.
Bias Drive
Sample code to choose bias as an average of the first three channels.
WREG BIAS_SENSP 07h // Select channel 1—3 P-side for bias sensing
WREG BIAS_SENSN 07h // Select channel 1—3 N-side for bias sensing
WREG CONFIG3 b’x11x 1100 // Turn on bias amplifier, set internal BIASREF voltage
Sample code to route the BIASOUT signal through channel 4 N-side and measure bias with channel 5. Make
sure the external side to the chip BIASOUT is connected to BIASIN.
WREG CONFIG3 b’x111 1100 // Turn on bias amplifier, set internal BIASREF voltage, set bias measurement bit
WREG CH4SET b’xxxx 0111 // Route BIASIN to channel 4 N-side
WREG CH5SET b’xxxx 0010 // Route BIASIN to be measured at channel 5 w.r.t BIASREF
Copyright © 2012, Texas Instruments Incorporated
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