ADPD6000 datasheet(30/89 Pages) AD

30 / 89 page

Data Sheet

ADPD6000

APPLICATIONS INFORMATION

analog.com

Rev. 0 | 30 of 89

When collecting the lit data with the LIT_OFFSET_A bit changing,

the data is lower than 16384 (unsaturated).

Figure 44. Timing of CT_DBLP3112 (Green LED)

ECG PATH

Figure 45 shows a typical connection diagram for the three-elec-

trode ECG application. Figure 45 captures the external components

required around ADPD6000, including current limitation resistors

for the ECG channel. These component values were designed

by users considering the maximum current of every channel. For

example, it is suggested to use 51 kΩ, 51 kΩ, and 330 kΩ on the

ECGIP, ECGIN, and RLD channels, respectively, for reference.

The signal data for ECG measurement that is read from FIFO

follows Equation 9:

Signal = VINVResolution+8,388,608 LSB (9)

Note that 8,388,608 is the center code of the ADC.

Table 16 shows the relevant register settings for the basic ECG

measurement.

Figure 45. System Overview of ECG Circuit Showing ECG Channel Protection and External Components Requirements

Table 16. Relevant Settings for ECG Measurement

Group

Bit Field Name

Description

ECG_ANA_CTRL

0x0100, Bit 10

ECG_INP_CONNECT

ECG input connection. Set 1 to connect the ECG inputs.

0x0100, Bit 8

ECG_CHAN_RESOLUTION

Set to 0 for 286 nV/LSB, and set to 1 for 572 nV/LSB.

0x0100, Bits[5:4]

ECG_RLD_OUT_SEL

Set to 0x3 to set regulated common-mode input.

0x0100, Bit 3

ECG_RLD_SAT_EN

Set to 1 to enable DCLO for RLD.

0x0100, Bits[2:1]

ECG_RLD_SAT_THRESHOLD

Select the DCLO threshold for RLD.

0x0100, Bit 0

ECG_RLD_EN

Set to 1 to enable RLD.

ECG_LEADOFF_CTRL

0x0101, Bit 15

ECG_ACLO_EN

Set to 1 to enable the ACLO detector for the ECG inputs.

0x0101, Bits[14:12] ECG_ACLO_MAG

Select the ACLO excite current magnitude.

0x0101, Bits[11:9]

ECG_ACLO_THRESHOLD

Select ACLO threshold for the ECG inputs.

0x0101, Bit 8

ECG_DCLO_EN

Set to 1 to enable the DCLO detector for the ECG inputs.

0x0101, Bits[7:4]

ECG_DCLO_MAG

Select the DCLO excite current magnitude.

0x0101, Bit 3

ECG_DCLO_POLARITY_IN

Select DCLO output current polarity at ECGIN.

0x0101, Bit 2

ECG_DCLO_POLARITY_IP

Select DCLO output current polarity at ECGIP.

0x0101, Bits[1:0]

ECG_DCLO_THRESHOLD

Select DCLO threshold for the ECG inputs.

ECG_DIG_CTRL

0x0102, Bits[8:3]

ECG_OVERSAMPLE_RATIO

For ECG only mode, keep the default value. For multimodal, refer to the

0x0102, Bits[2:0]

ECG_ODR_SEL

Select the ECG ODR.

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