AN172
Rev. 0.4
9
6.8. Expansion I/O Connector (J24)
The 96-pin expansion I/O connector J24 is used to connect daughter boards to the main target board. J24 provides
access to many C8051F020 signal pins. Pins for +3 V, digital ground, analog ground and the unregulated power
supply (VUNREG) are also available. The VUNREG pin is connected directly to the unregV pin of the P1
power connector. See Table 6 for a complete list of pins available at J24.
The J24 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.
Pin #
Description
Pin #
Description
Pin #
Description
A-1
+3 VD2 (+3.3 VDC)
B-1
DGND (Digital Gnd)
C-1
XTAL1
A-2
MONEN
B-2
P1.7
C-2
P1.6
A-3
P1.5
B-3
P1.4
C-3
P1.3
A-4
P1.2
B-4
P1.1
C-4
P1.0
A-5
P2.7
B-5
P2.6
C-5
P2.5
A-6
P2.4
B-6
P2.3
C-6
P2.2
A-7
P2.1
B-7
P2.0
C-7
P3.7
A-8
P3.6
B-8
P3.5
C-8
P3.4
A-9
P3.3
B-9
P3.2
C-9
P3.1
A-10
P3.0
B-10
P0.7
C-10
P0.6
A-11
P0.5
B-11
P0.4
C-11
P0.3
A-12
P0.2
B-12
P0.1
C-12
P0.0
A-13
P7.7
B-13
P7.6
C-13
P7.5
A-14
P7.4
B-14
P7.3
C-14
P7.2
A-15
P7.1
B-15
P7.0
C-15
P6.7
A-16
P6.6
B-16
P6.5
C-16
P6.4
A-17
P6.3
B-17
P6.2
C-17
P6.1
A-18
P6.0
B-18
P5.7
C-18
P5.6
A-19
P5.5
B-19
P5.4
C-19
P5.3
A-20
P5.2
B-20
P5.1
C-20
P5.0
A-21
P4.7
B-21
P4.6
C-21
P4.5
A-22
P4.4
B-22
P4.3
C-22
P4.2
A-23
P4.1
B-23
P4.0
C-23
TMS
A-24
TCK
B-24
TDI
C-24
TDO
A-25
/RST
B-25
DGND (Digital Gnd)
C-25
VUNREG
A-26 AGND (Analog Gnd)
B-26
DAC1
C-26
DAC0
A-27
CP1-
B-27
CP1+
C-27
CP0-
A-28
CP0+
B-28
VREF
C-28
VREFD
A-29
VREF0
B-29
VREF1
C-29
AIN0.7
A-30
AIN0.6
B-30
AIN0.5
C-30
AIN0.4
A-31
AIN0.3
B-31
AIN0.2
C-31
AIN0.1
A-32
AIN0.0
B-32 AGND (Analog Gnd)
C-32 AV+ (+3.3 VDC Analog)
Table 6. J24 Pin Descriptions
