ST TN100 RF, User Manual, Page: 12 / 37

Obsolete Product(s) - Obsolete Product(s)
TN100 sensor board UM0579
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3.2 General-purpose and reset buttons
There are four push-buttons available on the board. S1 is a system reset button. Buttons S2
to S4 can be used as general-purpose. The related schematics are in
Table 8 .
Table 7. RS-232 lines TX and RX, cross or direct cable selection
RS-232 cable selection Jumper selection
Crossed
Direct
AM00267
2 4
1 3
AM00268
2 4
1 3
Table 8. General-purpose and reset buttons description table
Reference
Board pin
connection
Microcontroller
pin connection
Function Schematics
S1 7 Reset
S2 1 PB5 General-purpose
C7
100 nF
S1
GM: DT2112C
NRST
AM00273
C10
100 nF
S2
GM: DT2112C
PB5
R15
0
Ω
R41
100
Ω
AM00274