4.2
Headers and Connectors
The following sections describe the implementation of the relevant connectors and headers on the evaluation kit and
their connection to the PIC32CM JH01 microcontroller. The tables of connections below also describe which signals
are shared between the headers and on-board functionality.
4.2.1
Power Header
The power header can be used to connect external power to the Curiosity Pro evaluation kit. The kit will automatically
detect and switch to any external power if supplied. The power header can also be used as supply for external
peripherals or extension boards. Care must be taken not to exceed the total current limitation of the on-board
regulator when using the 3.3V or 5.0V pin.
• External power
• Embedded Debugger USB
Table 4-2. Power Header
Pin number
Pin name
Description
1
5.0V_EXT
External 5V input
2
GND
Ground
3
5.0V_IN
Unregulated 5V (output, derived from one of the input sources)
4
VCC
Regulated 3.3V or 5.0V (output, used as main power supply for the kit)
All Curiosity Pro evaluation kits have one or more dual-row, 20-pin, 100 mil extension header (with a pitch of 2.54
mm), which can be used to connect a variety of extension boards to the kit, or to directly access the pins of the target.
The Curiosity Pro evaluation kits have male headers, while extension boards have their female counterparts. All pins
are not always connected, and all connected pins follow the defined pin-out description given in the table below.
Table 4-3. Extension Header
Pin number
Name
Description
1
ID
Communication line to the ID chip on an extension board
2
GND
Ground
3
ADC(+)
Analog-to-digital converter, alternatively positive part of differential ADC
4
ADC(-)
Analog-to-digital converter, alternatively negative part of differential ADC
5
GPIO0
General purpose I/O ‘0’
6
GPIO1
General purpose I/O ‘1’
7
PWM(+)
Pulse-Width-Modulation, alternatively positive part of differential PWM
8
PWM(-)
Pulse-Width-Modulation, alternatively negative part of differential PWM
9
IRQ/GPIO
Interrupt request line and general purpose I/O
10
SPI_SS_B/ GPIO SPI select for general purpose I/O
11
I2C_SDA
Data line for I
2
C interface. Always implemented, bus type.
12
I2C_SCL
Clock line for I
2
C interface. Always implemented, bus type.
13
UART_RX
Receiver line of target device UART
14
UART_TX
Transmitter line of target device UART
15
SPI_SS_A
SPI select. Must preferably be unique.
16
SPI_MOSI
Host out Client in line of serial peripheral interface. Always implemented, bus type.
EV81X90A
Hardware User Guide
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User Guide
DS70005482B-page 11
