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MAX30002 Datasheet(PDF) 17 Page - Maxim Integrated Products |
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MAX30002 Datasheet(HTML) 17 Page - Maxim Integrated Products |
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17 / 44 page ![]() Current Generator The current generator provides square-wave modulating differential current that is AC injected into the body via pins DRVP and DRVN with the bio-impedance sensed differentially through pins BIP and BIN. Two and four electrode configurations are supported for typical wet and dry electrode impedances. Current amplitudes between 8µAPK to 96µAPK are select- able with current injection frequencies between 128Hz and 131.072kHz in power of two increments. See register CNFG_BIOZ (0x18) for configuration selections. Current amplitude should be chosen so as not exceed 90mVP-P at the BIP and BIN pins based on the network impedance at the current injection frequency. A 47nF DC blocking capacitor is required between both DRVP and DRVN and their respective electrodes. Table 2. Programmable Resistive Load Values RNOM (Ω) RMOD (mΩ) RVAL RMOD <2> <1> <0> <3> <2> <1> <0> 5000.000 - 0 0 0 0 0 0 0 2960.7 0 0 0 0 0 0 1 980.6 0 0 0 0 0 1 0 247.5 0 0 0 0 1 0 0 2500.000 — 0 0 1 0 0 0 0 740.4 0 0 1 0 0 0 1 245.2 0 0 1 0 0 1 0 61.9 0 0 1 0 1 0 0 1666.667 — 0 1 0 0 0 0 0 329.1 0 1 0 0 0 0 1 109.0 0 1 0 0 0 1 0 27.5 0 1 0 0 1 0 0 1250.000 — 0 1 1 0 0 0 0 185.1 0 1 1 0 0 0 1 61.3 0 1 1 0 0 1 0 1000.000 — 1 0 0 0 0 0 0 118.5 1 0 0 0 0 0 1 39.2 1 0 0 0 0 1 0 833.333 — 1 0 1 0 0 0 0 82.3 1 0 1 0 0 0 1 27.2 1 0 1 0 0 1 0 714.286 — 1 1 0 0 0 0 0 60.5 1 1 0 0 0 0 1 20.0 1 1 0 0 0 1 0 625.000 — 1 1 1 0 0 0 0 46.3 1 1 1 0 0 0 1 15.3 1 1 1 0 0 1 0 MAX30002 Ultra-Low-Power, Single-Channel Integrated Bioimpedance (BioZ) AFE www.maximintegrated.com Maxim Integrated │ 17 |
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