This is a multi-part message in MIME format. ------=_NextPart_000_009F_01C49803.7D6A2A50 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: 7bit > So, using a 1M 1% resistor will give you 100pA, resolution, >200nA full scale, and typically better than 1% accuracy (with > a low-end 3.5 digit DVM) I've tried that, and it seems to work, thanks. You need to short the 1M first so that the PIC powers up properly and executes the SLEEP. After a couple of minutes the reading has dropped from an initial 23mV to a low low low 1.5mV. Impressive. Attached is the actual circuit under test. Intention is for it to be a sensor that you can download parameters to and receive data from. So far it's meeting all expectations admirably, but there's a little tinkering to do yet (on Vref, internal s/w scaling, multi-functioning pins etc) ------=_NextPart_000_009F_01C49803.7D6A2A50 Content-Type: image/gif; name="sensor.gif" Content-Transfer-Encoding: base64 Content-Disposition: attachment; filename="sensor.gif" R0lGODlhegERAYAAAAAAAP///ywAAAAAegERAQAC/oyPqcvtD6OctNqLs968+w+G4kiW5omm6sq2 7gvH8swCdgccOc33/g+s6UC7oPGITCoNRYRtl3tCAzcnk0ptMqvLrvcLtmix19u02jxPh9fJmByO y+eocTHaxrfz8HvivaA3BEhXaHgYYTfI58cm2KgjJSnJ1hc5iZmpucmZifgJWuE3yrhWtrWnRdgg eJrIJRQqO8vwdMmHFaVKpvtXKRpIsWoyTGt8XJvICutSTOKMHH3sDA1THXItrb3dlf3hzR0u3gOO M36OrlTOsZ7u/i7SniEPX2+PQS92v89fkq/fL6BADf8ADjyI8EFBgwkbOlzI0KHEgxCFTbyIsKIE /o0YOyLiqNCjSH4gWY08Ca+kSZQsx6lc2TKmtJcwZdqcRbMmMWZZTO25CdSitRSQLO0KitTN0Fg/ UyV9quxFzix/bDmFijWZ1BZpKrXKCrbpiqk/IX0Nm5WslTq/iqp918hq0Ldin3GBwoxuOlJ1W+rV izZkLl9A/wYOcobwTcOHfyReu3jpDMD1Hv+SyXhyY1eW5kqW0TVsK7mFP8cIvRkpp7E88JJODXsE XVioYxeexFVqbcr2Xts216x27KKYeRLVDXm44t/ssHUi/Ty69OnUcX+rjj0vcw8QqQmvyvvCwpxH t2/o/ip5sDjjWfetufsyVPQQaAsO036scQeP/ojLf0qfQt8t90V+STzCy1p48OTbSAHyN6B6XhiI BII+qVHWfzq9J86DSvEnB4VGxMVZgmYRaNIu4bWGjXj3gSEiYlIwomBncGzxnFdeZcdjj9bN02JE CqwoJEEH+nJHV3hdpSGIKm60n2lFGjllk0d+c+UibZlYXjlvXEOklVFhGU+IREyzDGVhcjgmd7KZ SSYtaw4JhDweusnemYfNaWeQfsKoZ2B8nvdnnPgFKlqdhCJq6KGNpuXYoo8Cx1RPt9yIIpV7+tAn o3jqpyNfdD7qH2aRavqpp8TYaGGGpJbql6KoUqrqCSeSEiE+dJJoqqxA1iqpe0YNosikosaK/liw tE5qa6iLFJtqKnN+Mm2nzCp7nFO4rhftsTGR5WO44o7r4684XuqTmMA4W5oK0zp6GqO8RpatSGoC O5+wHgEWI1jgnpTZsolWei6O5YF3SZLvVsnWtUm91SWTxs2LoCH3OqxabpdVfNaTnC0slJSz+lvp l45givKwbHYDGr4Pl3zLjAkqZovMsAIaL8YZ6+txwgcPBhnIH4psLlr/Bt2XybjoaHHLOnumb8Ep Ty2XHVHiTLSum0a9111Va5dztCRzfQ7FNk7trss7pw0XkhtLSDC2kJLdIbcHXyz23GwnF1qDlgK9 ssaWyvx22ALrXe/HokK74M2mnYUy3odj/nW0lkD/rIgejjOVbsr89ks5wa32Ae2zTNJQNXi0kZud 2t9u0izTljWV+SmU0PG56+a56DON6tUOuNAbOZ33wz+uSjvpZ2urfODqED/57pL2zMt+Vo12RHSj Zs270VcXipHkzUkP/kXiy03+yHvdqItv56ufftFt36Xh+/LHD3/Zl9fPWs1m/N++wQFQgAEU3kQM 2L+ZUW1vcLtfA/HHrZSYiH+GGx8E0ac/ywCCPBG0YAcvqJXKNG+BiVNXyD4Iwu1JEDUbZOADGYbA hsSwQqgrXgqH5yAXZgqGNwRRDkuoQq2FsIdBDJ8Ot/c9FJrwgjPM3qmSWEQitqkjHFQG/oNeFEUp NnFER6wF2AJxvCVCcIvJAiKEnIAJn01MikqUyLu+CEa/sbGND+miF7PYE+vNcYdutCMY+Sg1PPaQ jL6KHZTQGEY5ToV1jExjnn7oGDgOEXpZwtq+/GiFK8aRcC8sHxcfaS9M5sEbq1jkhOAUSjPSjJQ+ VGUZ02QwhcXNfOTwICVpCBPsbU53A6niJIVIR0++0m7sA6Qw6wjEzgFTkMc8FSzzWDpDXjKZUMTh L4WBBgLFsJRaiqY0S4YGm4XzenL0x2mqOcU4feVnuAxhxZz3tHjcimZI456nOJk/tNXnZGLZZivf CbFmeA5TLdRnww4qRmsG85+ng6dm/iB0IWjSDaHEGicLy2nOZB5zHfNkJqdQKTh+Mm2gIS2pLdVp uU5+FJQlJc68jPkmjeKLo1uiY5csyjdyKqyg8AqpcF66yzKlzX8FHCBRCYhUO0nSSl5j3ij5JtJr RpFfkqGE1VyKTl4KNZ4UrUokIme690AOpus0aEZTuRWtIi8ZCwKrxNyXxzTBTmJqxOgyjWhPhs3S dB2DTgS96dCy8lSt/VCFJ7ZqQ9msMUWDAazSSOrRTBFCI4R0JsLOmlg/AZafpoDciYqZtG9mNiGT FS0GC8XOGpFOmWmwqGs21My70lKqXIVSIw9buCWohLIAgy1ha/m7U671t/so7XDh/rXZYcY0thnx bW1l9NjnHXe0zaUtdUFayeUS9x7GxWwo/Dnd6CFzoactBHi9e91eOncec/2IcNErXhlat7q6Ne1J ZwtTgoTxEOeFb3lJe83WytKsaGJZV/9L3yDS72MGtSt22+nffMo3l6xSWWUlvFJrGja5GE7wX9nV WP0ZOD2uAi1iFTu7C3MoYgzO6ndvC+Phkeiz2t1q4xL6yQ92NMQeZq6GV5vf7p2YxyomIT1bTOC2 RdggCyZoje+5P/MqUcDocqiIn4HSzkZ2XU/WXC4cXEiVIgvLn/JyXe5EqglKeb5jfrK51tCgipRk W6hYM5tRMudbxpcd2cwVisPV/ski13fJ9r3vAVu5Nje70tDGuGm6btckQY9Y0YvuMCiaqrKaipW7 NQvynbGpCZPu+cVfjWZ8Pq2Nn1r6waOOCDXY0lZT47O7Sq6nA/kM6b0i2NX7hDWPg+tW8qY6dVbe MqsZPT1X6NTXbdVmbo3NDW8J2TlUHXKZ6/zSjMI5pcujdW+4Pe3vUro5ZrFZtjrrWhNDc7/ocEur j62sr9lnnzTGcYYpstRwX1q7ZqNKmz5bWUnbGSfL7Vmze12WJve0MQKH9tAeG9RtNHzg+7ZxzPz6 bSq6GNULv3YmhZ1qKtobRREf0cYR3pno1rqPYv6lwlEH4+pcFrKIHNIXr+fp/ryyJ+av8dKuolpB AcnZ42916sh1jbtv0hSJST4wop/775NpeXk5rvharbWje6fz3UNLOZAbyt6dJozLVt9JPiJGpGzw Vl7dpOs/+u1zWZCRhU0vNMe7ftJRzGjHsxqdvptmSa/X8IRQh627z/Z2YuJz64B/76Dxnl6hZ/Nv O0pt94jKYZAXaPOchzzXsTvWuot+0tl9vEILj9zkWXnixQ566bEYedy9nPKebzzpX//02BdWTp2/ fe4/v3ve+x73mq89y+Xee9Oj/Do8b77ztYf85eBcz3WY/KVafnT1Bh+NINa5Zk3sZ6lSGcAk+blT A7Y3M4+U8HWm+vaLS0zb/rm++rMrseRvB9C4vh/+R/4y9a/ubxKSeEbHesAXbf13cAIlOAk4WG9m OQWIbBI0UgkYf2D2e4Z0cNyUbAxWfgJxN5OngcGza9RWCnBlQYuzf9wlVGV1a1UnV7k2fiV3gCkI HCwoWy7IeGilgjFlg38XZqeHZwGxdj2oV1qXg9NEg4RSbz6oXMsXhEJYJuO3aoNnfEhobf2lfMR3 d6TFW9QDYVn4hU4IMDFGV7EEaKjnfSzCfmPYLF44gkfIfBFoWXCIV6aFZi2IUlP4UFUoctRCBHmG fcX3f1vYY0nHfDyXcw43iIJYiHMwHoCYfaM3f+vVhxhIaGRHZpIYiHsI/oS9ZSsyiIlvGHZyaISw 54nmlG0GSIk/GIamCEkAuHa6t4iT0V6IhFs6eFYnR4dr2Ip7FF4WF4uqmIbnlGubZIGN+H00dVTL aFTNWFShR4W+WGkeBw4heDgLs03odIzk515omFbSOI1zmIimiI3gKEriuInk6ETm6HTrSIji547s eInJh4fxKI/j1oTpaFP2eI8+BlzvGGj82I/eqIBbOHuKeI4DyYQdVx/KRI8KKYzfGExWk2TlCJH+ qIaqo0gzJ4YZeZGy6HqOtG6rw4vR+JGkqFuL9zuSBoFQ43i26G0BuIsSeZKiyIkc2UFZZZE1iZL/ aHMbBoNgIpA8WYQP/qlNuoiORBmKryeSJAeN+hiOSnmBQ1ls1jeVNymVS9mLVblLO5mVRfmSC7mV X+mKVKmJgOSVZMmHrBiJqgWV7aiWq5iUredFmSd0qneDcSmXYTmKWTaOb5mVTWSN+qVJlwd2WqmX AEmTf5l7S6dAWJeYZYmDgKljDlgieRmZjDmZengf0gaWkSmYVxlujhl+nZiZCNkyzPiMSeWMg3Me +faZidlwd2hyz2ebt4mbudkJZReRp/ky2+Wbv0mQr9CSwYmPsWmYxsmNIHl6xamczFmXMaeZzxly yeec1GmTe3id2MmZMLed3FmP4ElE3ymeM1iebLQa56me6+kX7MaeD+8Jn26ElPFJn/U5RwUAAAA7 ------=_NextPart_000_009F_01C49803.7D6A2A50 Content-Type: text/plain; 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