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C8051F50x/51x
12 Rev. 0.2
5.10. Voltage Reference (VREF) Connectors (J22 and J32)
The VREF connectors can be used to connect the VREF pin from the MCU (P0.0) to external 0.1 uF and 4.7 uF
decoupling capacitors. The C8051F500 (Side A) device is connected to the capacitors through the J22 header and
the C8051F502 (Side B) device connects to its own set of capacitors through J32.
5.11. Expansion Connector (P1)
The 96-pin expansion I/O connector P1 is used to connect daughter boards to the main target board. P1 provides
access to many C8051F500 signal pins. Pins for VREGIN, VDD, VIO, and 3.3V are also available. See Table 10 for
a complete list of pins available at P1.
The P1 socket connector is manufactured by Hirose Electronic Co. Ltd, part number PCN13-96S-2.54DS, Digi-Key
part number H7096-ND. The corresponding plug connector is also manufactured by Hirose Electronic Co. Ltd, part
number PCN10-96P-2.54DS, Digi-Key part number H5096-ND.
Table 10. P1 Pin Listing
Pin # Description Pin # Description Pin # Description
A-1 +3.3V B-1 GND C-1 N/C
A-2 N/C B-2 N/C C-2 N/C
A-3 N/C B-3 N/C C-3 N/C
A-4 N/C B-4 N/C C-4 N/C
A-5 N/C B-5 N/C C-5 N/C
A-6 N/C B-6 N/C C-6 N/C
A-7 N/C B-7 N/C C-7 N/C
A-8 N/C B-8 N/C C-8 N/C
A-9 N/C B-9 N/C C-9 N/C
A-10 N/C B-10 P0.7_A C-10 P0.6_A
A-11 P0.5_A B-11 P0.4_A C-11 P_0.3_A
A-12 P_0.2_A B-12 P0.1_A C-12 P0.0_A
A-13 P4.7_A B-13 P4.6_A C-13 P4.5_A
A-14 P4.4_A B-14 P4.3_A C-14 P4.2_A
A-15 P4.1_A B-15 P4.0_A C-15 P3.7_A
A-16 P3.6_A B-16 P3.5_A C-16 P3.4_A
A-17 P3.3_A B-17 P3.2_A C-17 P3.1_A
A-18 P3.0_A B-18 P2.7_ C-18 P2.6_A
A-19 P2.5_A B-19 P2.4_ C-19 P2.3_A
A-20 P2.2_A B-20 P2.1_A C-20 P2.0_A
A-21 P1.7_A B-21 P1.6_A C-21 P1.5_A
A-22 P1.2_A B-22 P1.3_A C-22 P1.4_A
A-23 P1.1_A B-23 P1.0_A C-23 N/C
A-24 C2D_A B-24 N/C C-24 N/C
A-25 /RST_A B-25 GND C-25 N/C
A-26 GND B-26 N/C C-26 N/C
A-27 N/C B-27 N/C C-27 N/C
A-28 N/C B-28 N/C C-28 N/C
A-29 VREF0 B-29 VDD_A C-29 VREGIN_A
A-30 N/C B-30 N/C C-30 N/C
A-31 N/C B-31 N/C C-31 N/C
A-32 N/C B-32 AGND C-32 N/C
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