CNFG_BMUX(0x17)

CNFG_BMUX is a read/write register which configures the operation, settings, and functionality of the input multiplexer

associated with the BIOZ channel.

Table 21. CNFG_BMUX (0x17) Register Map

Table 22. CNFG_BMUX (0x17) Register Functionality

REG

NAME

R/W

23/15/7

22/14/6

21/13/5

20/12/4

19/11/3

18/10/2

17/9/1

16/8/0

0x17 CNFG_

BMUX

R/W

x

x

OPENP

OPENN

CALP_SEL[1:0]

CALN_SEL[1:0]

x

x

CG_MODE[1:0]

EN_BIST

RNOM[2:0]

x

RMOD[2:0]

x

x

FBIST[1:0]

INDEX

NAME

DEFAULT

FUNCTION

D[21]

OPENP

1

Open the BIP Input Switch (most often used for testing and calibration)

0 = BIP is internally connected to the BIOZ channel

1 = BIP is internally isolated from the BIOZ channel

D[20]

OPENN

1

Open the BIN Input Switch (most often used for testing and calibration)

0 = BIN is internally connected to the BIOZ channel

1 = BIN is internally isolated from the BIOZ channel

D[19:18]

CALP_

SEL[1:0]

00

BIP Calibration Selection

00 = No calibration signal applied

01 = Input is connected to VMID

10 = Reserved. Do not use.

11 = Reserved. Do not use.

D[17:16]

CALN_

SEL[1:0]

00

BIN Calibration Selection

00 = No calibration signal applied

01 = Input is connected to VMID

10 = Reserved. Do not use.

11 = Reserved. Do not use.

D[13:12]

CG_

MODE[1:0]

00

BIOZ Current Generator Mode Selection

00 = Unchopped Sources with Low Pass Filter

(higher noise, excellent 50/60Hz rejection, recommended for BioZ applications)

01 = Chopped Sources without Low Pass Filter

(low noise, no 50/60Hz rejection, recommended for BioZ applications

with digital LPF, possibly battery powered BioZ applications)

10 = Chopped Sources with Low Pass Filter

(low noise, excellent 50/60Hz rejection)

11 = Chopped Sources with Resistive CM Setting

(Not recommended to be used for drive currents >32µA)

(low noise, excellent 50/60Hz rejection, lower input impedance)

D[11]

EN_BIST

0

BIOZ Modulated Resistance Built-In-Self-Test (RMOD BIST) Mode Enable

0 = RMOD BIST Disabled

1 = RMOD BIST Enabled

To avoid body interference, the BIP/N switches should be open in this mode.

When enabled, the DRVP/N isolation switches are opened and the DRVP/N-to-BIP/N

internal switches are engaged. Also, the lead bias resistors are applied to the BIOZ

inputs in 200MΩ mode.

MAX30002

Ultra-Low-Power, Single-Channel Integrated

Bioimpedance (BioZ) AFE

www.maximintegrated.com

Maxim Integrated │ 32