MAX30002 datasheet(40/44 Pages) MAXIM

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BIOZ Data Tags (BTAG)

The final three bits in the sample are used as a data tag

(BTAG[2:0] = D[2:0]) to assist in managing data transfers.

The BTAG structure used is detailed below.

VALID: BTAG = 000 indicates that BIOZ data for this

sample represents both a valid voltage and time step in

the BIOZ record.

OVER or UNDER RANGE: BTAG = 001 indicates that

BIOZ data for this sample violated selected range thresh-

olds (see MNGR_DYN and CNFG_GEN) and that the

voltage information in the sample should be evaluated to

see if it is valid or indicative of a leads-off condition. Note

that while the voltage data may be invalid, samples of this

type do represent valid time steps in the BIOZ record.

VALID EOF: BTAG = 010 indicates that BIOZ data for

this sample represents both a valid voltage and time

step in the BIOZ record, and that this is the last sample

currently available in the BIOZ FIFO (End-of-File, EOF).

The µC should wait until further samples are available

before requesting more data from the BIOZ FIFO.

OVER or UNDER RANGE EOF: BTAG = 011 indicates

that BIOZ data for this sample violated selected range

thresholds (see MNGR_DYN and CNFG_GEN) and that

the voltage information in the sample should be evaluated

to see if it is valid or indicates a leads-off condition. Note

that while the voltage data may be invalid, samples of this

type do represent valid time steps in the BIOZ record.

This is also the last sample currently available in the BIOZ

FIFO (End-of-File, EOF). The µC should wait until further

samples are available before requesting more data from

the BIOZ FIFO.

EMPTY: BTAG = 110 is appended to any requested read

back data from an empty FIFO. The presence of this tag

alerts the user that this FIFO data does not represent a

valid sample or time step. Note that if handled properly

by the µC, an occurrence of an empty tag will not com-

promise the integrity of a continuous FIFO record – this

tag only indicates that the read back request was either

premature or unnecessary.

OVERFLOW: BTAG = 111 indicates that the FIFO has

overflowed and that there are interruptions or missing data

in the sample records. The BIOZ Overflow (BOVF) bit is

also included in the STATUS register. A FIFO_RESET is

required to resolve this situation, effectively clearing the

FIFO so that valid sampling going forward is assured.

Figure 9. Two-Electrode Respiration Monitor Typical Application Circuit

MAX30002

DGND

AGND

CSB

SDI

SCLK

SDO

INTB

INT2B

FCLK

MCU

CSB

MOSI

SCLK

MISO

INTB

INT2B

FCLK

VCM

VBG

VREF

DRVP

DRVN

RBIAS

10µF

1µF

10µF

324kΩ

CPLL

1nF

47nF

200Ω

47pF

10pF

BIP

BIN

ELECTRODES

AVDD

DVDD

OVDD

0.1µF

10µF

0.1µF

10µF

1.1V to 2.0V

1.65V to 3.6V

Typical Application Circuit

MAX30002

Ultra-Low-Power, Single-Channel Integrated

Bioimpedance (BioZ) AFE

www.maximintegrated.com

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