Analog Devices MAX30001 Manual page 21

MAX30001 Evaluation System
Powering the EV Kit
The MAX30001 EV kit can be powered from an external
supply or directly from the MAX32630FTHR. To use an
external supply, install a shunt on jumper J_EXT_PWR in
the 1-2 position. This connects the EXT_PWR test point
to the board's 5V rail. Set the power supply's output to
+5V, disable the output, connect the positive lead to EXT_
PWR and the negative to AGND1, then enable the supply.
To power the EV kit with the MAX32630FTHR, install a
shunt on jumper J_SYS in the 1-2 position to connect the
SYS node to the 5V rail. SYS regulates the USB voltage
or directly connects to the battery if present.
The MAX30001 IC receives power from OVDD, AVDD,
and DVDD. These pins receive power either through
the MAX32630FTHR, externally through test points, or
through adjustable LDOs U2 and U3. To supply the IC
from the MAX32630FTHR's 1.8V and 3.3V rails, place
a shunt in the 1-2 position on the 1V8 and 3V3 jumpers.
To use the onboard LDOs, place the shunts in the 2-3
position. Two potentiometers are available to set the U2
and U3 voltages: R4 and R10.
To operate the EV kit without a connection to a host
PC or power supply, insert a microSD card into the
MAX32630FTHR. After saving a test configuration, disconnect
the board from the host PC and connect a Li+ battery
to the MAX32630FTHR. Refer to the MAX32630FTHR
documentation for details on connecting a Li+ battery.
Press SW2 to trigger the measurements saved to the SD
card. The J_SYS shunt must be in the 1-2 position for this
configuration.
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Evaluates: MAX30001
Configuring the Board for Measurement
The MAX30001 EV kit offers several potential connection
and component configurations to enable a variety of tests.
Both the ECG channel and BioZ channel allow for user-
defined line resistance with resistors R26 and R27 for
BioZ, and R29 and R30 for ECG. By default, these resistors
are populated with 0Ω shunts but can be changed to suit
the application. The board also allows for the installation
of external low-pass filtering capacitors on the ECG and
BioZ lines. Capacitors C8 and C25 can create an external
common mode filter for the ECG and BioZ lines, respectively.
C24, C29, C26, and C28 filter ECGP, ECGN, BIP, and
BIN. The cutoff frequency of the filters is set by the value
of these capacitors and the input resistors R26, R27, R29,
and R30. The board also allows the ECGN and ECGP or
BIN and BIP inputs to be shorted with jumpers EP_EN
and BP_BN, respectively.
Refer to the MAX30001 EV kit schematic and MAX30001
EV kit PCB layout sections for component connections
and placements.
ECG Measurement
The EV kit ships configured to measure ECG with
balanced electrodes, R-to-R, and BioZ signals. The jumper
configurations required for these measurements are
shown in Figure 18. Connected jumpers are distinguished
with solid black nodes in the jumper box. To use the
electrode connectors on the EV kit, ensure the required
shunts are installed.
By default, the EV kit leaves the ECG channel balanced.
By removing the shunts on EN_UNBAL And EP_UNBAL,
the ECGN and ECGP lines each include a 51kΩ resistor
and 47nF capacitor in parallel.
MAX30002
Analog Devices │ 21