Chumby Hackers Board Illustrated
Note that connection labels correspond to the identifiers on the Version 1.0 schematics.
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JP300 : 5VDC Power : Requires a regulated 5VDC power supply, positive tip, 3.5mm OD, 1.4mm ID barrel jack (aka a 3.8mm or 4mm connector).
Schematics indicate 2A peak. According to AdaFruit the power draw for the subsystems is roughly:
- 300 mA for the base hardware (processor, RAM, SD card),
- 200 mA for the USB hub (not including power to the USB devices),
- 300 mA for a speaker plugged into the 2W output,
- 500 mA max for charging a Lipoly battery.
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P102 : Serial JTAG header - 0.1" male header (DNP)
- Pin 1 : 3.3v
- Pin 2 : DEBUG
- Pin 3 : PSWITCH
- Pin 4 : GND
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P406 : PWM2 : Pulse Width Modulation
- Pin 1 : GND
- Pin 2 : PWM2 (CPU)
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P400 : LRADC1 : Low Resolution Analog to Digital Converter
- Pin 1 : LRADC1 (CPU)
- Pin 2 : connected to pin 39 of P401 (why?)
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P104 : Rotary Quadrature Encoder (no connector, solder points only)
- Pin 1 : ROTARYA
- Pin 2 : GND
- Pin 3 : ROTARYB
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P200 : 9x2 header : USB, I2C and GPMI The following signals are available (by pin number)
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1 - 5V
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3 - USBC1 N
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5 - USBC1 P
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7 - GND
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9 - Vid to Ext
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10 - i2C SCL
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11 - i2C SDA
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15 - 3.3V
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17 - LCD XP
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19 - LCD YP
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21 - LCD XM
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23 - LCD YM
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25 - HOST TO CP UART
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2 - GPMI D00
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4 - GPMI D01
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6 - GPMI D02
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8 - GPMI D03
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10 - GPMI D04
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12 - GPMI D05
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14 - GPMI D07
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16 - GPMI D06
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18 - OSC TO FM
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20 - PWM2
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22 - CHUMBY BEND
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26 - CP TO HOST UART
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P100 : Li-poly battery connector : JST B3B-EH-A connector.
If powering from a Li-poly, USB0 will be powered, 1 and 2 will not.
There is a fourth USB connection on the GPIO header which is also powered by the Li-poly boost system. ref -
P500 - USB2 : USB Type A Female
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P503 - USB1 : USB Type A Female (is this really USB4?)
Note that the power to this port (and P500?) is software controlled and may be off at power-up. It can be enabled as explained here.