MAX32620HSP ECG with lead off detection

Dependencies:   mbed HSP_ECG MAX14720 USBDevice

Revision:
0:9ead5978d784
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/mbed.bld	Thu Mar 28 08:10:23 2019 +0000
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+https://os.mbed.com/users/mbed_official/code/mbed/builds/84c0a372a020
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