+--------------------+            +-------------------------+
  |                    |<--+-----+--|                         |
  |    BTNode          |   |     |  |   power supply / bat    |
  |                I2C |   |     |  |                         |
  +--------------------+   |     |  +-------------------------+
     ^ |  ^ |       | |    |     |                        |    +------+
     | |  | |       | +----------------------------+-----------|klinke|
     | |  | |       +---------------------------+--|-----------|i2cbus|
     | |  | |              |     |              |  |      |    +------+
     | |  | |              |     |              v  v      +------+
     | |  | |              |     |  +-----------------------+    |
     | |  | |            +---+   +->|U         SDA SCL  vcc |  +----+
     | |  | |            | I |----->|I    Support MSP430    |--| 3V |
     | |  | |            +---+      | a b c d  e f g  h i j |  +----+
     | |  | |              |        +-----------------------+
     | |  | |              |          ^ ^ ^ ^  ^ ^ ^  ^ ^ ^     
     | |  | |              |          | | | |  | | |  | | |     
     o--------------------------------+ | | |  | | |  | | |     
     | o--------------------------------+ | |  | | |  | | |   +-------+
     | |  o-------------------------------+-|--|-|-|--|-|-|---|       |
     | |  | o-------------------------------+--|-|-|--|-|-|---|       |
     | |  | |              |                   | | |  | | |   |       |
     | v  | v              v                   | | |  | | |   | DIL16 |
  +-----------------------------+              | | |  | | |   |       |
  |       tx rx           vcc   |              | | |  | | |   |       |
  |    boot/in              out1|--------------o-|-|--|-|-|-->|       |
  | event/out               out2|----------------o-|--|-|-|-->|       |
  |                         out3|------------------o--|-|-|-->|       |
  |                          in1|<--------------------o-|-|---|       |
  |    A80                   in2|<----------------------o-|---|       |
  |                          in3|<------------------------o---|       |
  +-----------------------------+                             +-------+



||'''A80'''               ||'''Support'''||'''DIL16'''||'''BTNode'''||'''Note'''||
||1  RESET                || P2.0/irq    || 13        || 14/PB4     ||inverted high=reset, low=free running, used for ROM-BSL start||
||2  OUT_OUT (P3.1)       || P2.1/irq    || 7         || -          ||open collector output, OUT1||
||3  PROG (P2.2)          || P2.6/irq    || 12        || 3/RTS0 (3) ||used for ROM-BSL start and ROM-BSL RX, lowpass input otherwise||
||4  OUT_DAT7 (P3.2)      ||   -         || -         || -          ||open collector output, unused, pin used below||
||5  OUT_DAT6 (P3.3)      ||   -         || -         || -          ||open collector output, unused, pin used below||
||6  OUT_DAT5 (P3.4)      ||   -         || -         || -          ||open collector output, unused, pin used below||
||7  OUT_DAT4 (P3.5)      ||   -         || -         || -          ||open collector output, unused, pin used below||
||8  IN_DAT3 (P1.5)       || P1.5/irq    || 1         || -          ||input only, IN1||
||9  IN_DAT2 (P1.4)       || P1.4/irq    || 2         || -          ||input only, IN2||
||10 IN_DAT1 (P1.3)       || P1.3/irq    || 8         || -          ||input only, IN3||
||11 IN_DAT0 (P1.2)       || P1.2/irq    || 11        || 30/PE3     ||input only, external event trigger||
||12 GND                  ||             || 9         || 16,40      ||common GND||
||13 VCC1                 || P6.3/ADC(1) || 16        || -          ||VCC (unfiltered)||
||14 UEBR0 (P3.4/U0TXD)   || P2.4 + P3.7 || 3         || 5/RXD0     ||serial debug and BSL port||
||15 DO2 (P3.2)           || P2.2/irq    || 5         || ''2/CTS0'' ||OUT2||
||16 UB_IREMP (P3.5/U0RXD)|| P2.5 + P3.6 || 4         || 4/TXD0     ||serial debug and BSL port||
||17 IR_PULS (P3.3)       || P2.3/irq    || 6         || 28/PE6     ||OUT3, event out||
||18 BRMESS (P6.2)        || P6.7/DAC    || 10        || -          ||IO or ADC, lowpass filter f=160kHz||
||19 UBATT_X              ||             || -         || -          ||power input (+)||
||20 GND                  ||             || -         || -          ||power input (-)||
|| -                      || P3.2/out    || -         || -          ||I2C 3k Pullup resitors to SCL and SDA, switchable||
|| -                      || P3.1/SDA    || 14        || 12/SDA     ||I2C SDA||
|| -                      || P3.3/SCL    || 15        || 13/SCL     ||I2C SCL||
|| -                      || P6.0/ADC(1) || -         || 9/PF0(1)   ||Battery voltage measurement||
|| -                      || P6.1/ADC(2) || -         || -          ||A80 current measurement, value||
|| -                      || P6.2/out(2) || -         || -          ||A80 current measurement, reset||
|| -                      || P4.1        || -         || -          ||red SMD LED 100R series R ||
|| -                      || XIN/XOUT    || -         || -          ||4MHz crystal||
|| -                      || all JTAG    || -         || -          ||JTAG on 14 pin header||
|| -                      ||             || -         || 17+18/VCCIN||External power to BTnode (from battery)||
|| -                      ||             || -         || -          || ||