Fluke 3870 microcontroller pin functions

This is a summary of the signals on the 40-pin 3870 "F8" CPU chip in the Fluke 8050A multimeter. It's intended primarily as a reference while wiring up the interconnects from this CPU to the STM32F103 microcontroller.

Signal 3870 Pin 3870 Pin Signal
Vcc/+5 40 1
39 2
38 3 RNGA
Z 37 4 RNGB
Y 36 5 RNGC
X 35 6 FB
W 34 7
33 8
32 9
31 10
30 11 ST4
29 12 ST3
28 13 ST2
27 14 ST1
26 15 ST0
25 16
24 17 FD
HV 23 18 FA
DP 22 19 FC
21 20 GND

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