ADPD4100 datasheet(48/101 Pages) AD

48 / 101 page

ADPD4100/ADPD4101

Data Sheet

Rev. 0 | Page 48 of 101

Table 28. Relevant Register Settings to Handle Different DC Offset Voltage Levels in ECG Measurements

Time Slot A Register Address1

Bit Field Name

Description

0x0100, Bits[11:10]

INPUT_R_SELECT_x

Set to 0x0 for 500 Ω series input resistor. Set to 0x1 for 6500 Ω series input

resistor.

0x0104, Bits[5:0]

TIA_GAIN_CHx_x

Select TIA gain.

0x0107, Bits[7:0]

NUM_REPEAT_x

Number of sequence repeats.

1 This is the Time Slot A register address. Add 0x020 for the identical register address for each subsequent time slot. For example, Register 0x0100 is the location for

SAMPLE_TYPE_A. For Time Slot B, this register is at Address 0x0120. For Time Slot C, this register is at Address 0x0140. For Time Slot D, this register is at

Address 0x0160, and so on.

The following configuration enables low dc offset ECG

measurement in Time Slot A and three-electrode lead off

detection in Time Slot B:

# ADPD4100 ECG Measurement with small DC

offset in Timeslot A and Three-Electrode

Lead-Off Measurement in Timeslot B

0009 0080

# 32MHz oscillator trim

000B 02B2

# 1MHz oscillator trim

000D 0D05

# Sampling rate 300 Hz

000F 0006

# 1MHz low frequency oscillator

0010 0100

# Timeslot A and B enabled

0020 2200

# Float input 1&2 and 3&4

during sleep

0021 0001

# IN1/IN2 configured as a

differential pair

# Timeslot configuration #

# ADPD4100 ECG Measurement with small DC

offset

0100 0000

# Input resistor 500 Ω

0101 00E6

# skip preconditioning,

bandpass filter bypassed

0102 0007

# IN1&IN2 differential pair to

channel 1

0103 0000

# float during preconditioning

0104 02C1

# TIA gain 100k, TIA_VREF =

0.88V

0105 0000

# LEDs off

0106 0000

# LEDs off

0107 0102

# 2 pulses

0108 1000

# float mode, minimum period

010A 0203

# Integrator pulse width,

bandpass filter powered down

010B 01A0

# Integrator pulse timing

offset

010C 0210

# Modulation pulse width and

offset

010D 0000

# Chopping mode disabled

010E 0000

# no ADC offset

010F 0000

# no ADC offset

0110 0003

# Configure number of bytes

written to the registers

# Timeslot B – Three-Electrode Lead-Off

Detection on IN3/4

0120 4000

# CH2 active

0121 40DA

# 8 µs preconditioning, TIA-

BPF-INT-ADC

0122 0050

# IN3 to CH1, IN4 to CH2

0123 5A45

# Precondition to TIA_VREF,

pulse VC2_VREF by 215 mV

0124 E212

# 50k TIA GAIN both channels,

TIA_VREF=0.88V

0125 0000

# LEDs off

0126 0000

# LEDs off

0127 0110

# 16 pulses, single

integration

0128 0000

# continuous TIA connection

012A 0003

# Integrator pulse width

012B 0216

# Integrator pulse timing

offset

012C 0210

# Modulation pulse width and

offset

012D 0000

# Integrator chopping off

012E 0000

# No ADC Offset

012F 0000

# No ADC Offset

0130 0003

# Configure number of bytes

written to the registers

Two-Electrode Lead Off Measurement

This measurement method can detect the lead off condition

without requiring a third electrode at the expense of not being

able to differentiate if one electrode or both electrodes have lost

contact with skin. Two-electrode lead off measurement is useful

in cases where either a separate electrode is not available, a

smaller form factor with less components is desired, or the

power requirement is tighter because power consumption of

two-electrode lead off measurement is lower. In two-electrode

lead off measurement, the stimulus from an unused VCx pin to

the body can be provided through one of the ECG electrodes.

Only one separate input is used to detect the lead off condition

through the impedance measurement.

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