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USB interface ...................................................................................................................................................... 8 2.1.1
Boot voltage selection – DCIN signal .................................................................................................... 11 2.3.1
This document describes the Intel® Edison Breakout Board.
The Intel® Edison Breakout Board is designed to expose the native 1.8 V I/O of the Intel® Edison module. The board
consists of power supply, battery recharger, USB OTG power switch, UART to USB bridge, USB OTG port, and I/O
header.
1.1 References
Table 1 Product-specific documents
Reference Name Number/location
331188 Intel® Edison Board Support Package User Guide
This section explains some of the jumpers on the Intel® Edison Breakout Board. See Figure 2 for jumper locations.
• The left pin (the square one) on J2 is +V battery; the right pin is ground.
• J2 is the battery connector. If you want to power the breakout board with a rechargeable lithium-ion battery,
attach it to J2. (Refer to Figure 2 for battery polarity.) When you attach a rechargeable lithium-ion battery,
the breakout board will recharge the battery whenever power is applied via J21 or J22, or via J3 (when the
board is attached to a USB host).
Note: If you decide to use a battery pack on J2, we recommend a battery with a built-in thermistor. This
thermistor should attach to the charger on the breakout board. If you opt for the built-in thermistor,
remove the jumper on J1 and connect the thermistor to the pin labeled THERM in Figure 2. If you
choose not to use a battery with built-in thermistor, leave the jumper in place.)
•J3 is a micro USB FTDI serial-to-USB converter. The Linux console will output serial stream to this USB
connector.
•J16 is a fully USB compatible, micro AB, OTG (power “on the go”) port. If you plug a micro A cable into this
port, the Intel® Edison module will connect to a PC as the host; if you plug a micro B cable into this port, the
Intel® Edison module will connect to the PC as a device. (See the USB A female to micro A male cable, Digikey
P/N 10-00649 839-1105-ND in Figure 7.)
• For jumpers J17 through J20, the first pin on the left (the square one) is pin 1.
• J21 is the main power input. Apply 7 to 15 VDC with the polarity shown.
• J22 (on the bottom side of the board; see Figure 3) is for a power jack (not installed). You can purchase a
2.5 mm barrel jack (see the mini-breakout power jack in Figure 7, Digikey P/N PJ-002BH-SMT-TR CP002BHPJCT-ND) and solder it to the bottom side of the board as shown in Figure 3. The input voltage to J22
is also 7 to 15 VDC.
The Intel® Edison Breakout Board has a single USB 2.0 interface. This interface is the primary method for
downloading code on J16. It is designed to support full USB “On the Go” (OTG) connections, using the ID signal. If
you plug in a USB micro B connector, the breakout board will act as a USB device, and it will take its power from the
USB connector.
If you plug a USB micro A connector into it, the breakout board will function as a host. When you use the
Intel® Edison Breakout Board as a host in this manner, you must supply external power via J21 or J22. The
breakout board will convert that voltage to supply 5 V to the USB connector.
Note:If you power the breakout board with a battery, it will not supply power as a USB host.
When the pin mode is chosen as GPIO, it can be programmed as an output or input. When programmed as an input,
a GPIO can serve as an interrupt or wake source. Inputs have programmable pullups or pulldowns. Pullup value can
be 2, 20, or 50 kohm. I2C pins also have an additional 910 ohm value.
When in general purpose mode, input GPIO signals enter a glitch filter by default, before reaching the edge
detection registers. To ensure that a pulse is detected by the edge detection register, the pulse should be five clock
cycles long.
• 100 ns for a 50 MHz clock when SoC is in S0 state.
• 260 ns for 19.2 MHz clock when SoC is in S0i1 or S0i2 State.
• 155.5 µs for 32 kHz clock (RTC) when SoC is in S0i3 State.
Most GPIO capable pins are configured as GPIO inputs during the assertion of all resets and they remain inputs
until configured otherwise.
As outputs, the GPIOs can be individually cleared or set. They can be pre-programmed to either state when
entering standby. Output drive is ±3 mA.
Table 2 Intel® Edison breakout board expansion header signal list
Pin Description
J17 - pin 1 GP182_PWM2 GPIO capable of PWM output.
2.3 Intel® Edison Breakout Board expansion power supply
Intel® Edison is a low-power device. In general, it does not draw more than 200 mA with 600 mA short duration
spikes during Wi-Fi transmit. Therefore, an Intel® Edison device may run on USB power (when configured as a
device), or an external power adapter from 7 to 15 V.
Power from the external power adapter goes to a DC-DC converter and down-converted to 5 V. The 5 V rail is
diode ORed with the USB VBUS rail. This power goes to a battery recharger IC, which limits the output voltage to
4.4 V. This voltage is in the safe range for the Edison module VSYS. The VSYS power range is 3.15 to 4.5 V. This
allows the Intel® Edison device to run off a standard lithium-ion battery. The charger IC is configured to limit the
current to 1 A. The charger is programmed to charge at 190 mA. This charger is designed to charge standard
lithium-ion batteries with 4.2 V maximum charging voltage. You are responsible for choosing a suitable battery and
following all safety precautions, to prevent overcharging or charging when the battery temperature is too high.
CHARGING CURRENT = 190ma
TERMINATION CURRENT = 14ma
CR2
D2BW319000
21
CHARGE TIMER = 6.2 HOURS
INPUT CURRENT LIMIT = 1 AMP
USB_POWER
CR1
RB160M-40
21
5V 1
AMP
SWITCHER
CURRENT
LIMITED
1 AMP
BATTERY
CHARGER
EDISON
3.3V HEADER
1.8V HEADER
CR6 D2BW319000
21
CR7
D2BW319000
21
VIN_HEAD ER
J22
DC_JACK_SMT
SHUNT
2
IN_2
3
GND
1
IN_1
4
J21
12
The drawback to this design is that the linear supply power drop places a limit on the total power through the
Intel® Edison board and the 3.3 and 1.8 V supplies. The power loss through the charger will be (4.4 to 5 V) • current.
In this case, you should attempt to limit average current through the Intel® Edison board and its power rails to
approximately 0.75 A.
The recharger IC on the Intel® Edison breakout board has input current limit and overtemperature shutdown.
Assure the end design does not trip these protection mechanisms.
Some considerations of the power distribution in the Intel® Edison breakout board:
USB host mode always requires use of an external power adapter. 1.
You are responsible for choosing a suitable battery and following all safety precautions, to prevent 2.
overcharging or charging when the battery temperature is too high. The battery should be at least
300 mAH capacity, due to the 100 mA charging current. Intel recommends battery packs with internal
protection circuits.
Figure 4 Intel® Edison breakout board expansion board power distribution network
Boot voltage selection – DCIN signal 2.3.1
DCIN is a signal that indicates whether Edison is being powered from a battery or from an external power source.
DCIN also sets the voltage level required on VSYS in order to boot. When DCIN is floating or tied to ground, the
voltage on VSYS must rise from 2.5 to 3.5 V in 10 ms; otherwise the boot is aborted. When the boot is aborted,
power must be cycled below 2.5 V. If DCIN is connected to VSYS, Edison will start to boot when VSYS is above 2.5 V
for 100 ms.
Note: When DCIN is connected to VSYS, boot will occur whenever the voltage is above 2.8 V for 100 ms. The
Note: The absolute minimum voltage to assure Wi-Fi and Bluetooth functionality is 3.15 V.
The Intel® Edison breakout board (see Figure 2) has the following buttons:
•Power button. The power button (SW1) is configured by software. Pressing and holding the power button
will produce different results depending on the current state of the Intel® Edison compute module and the
duration of the hold:
− When the Intel® Edison device is completely powered down, pressing and holding the power button for
3 seconds will power up the device and boot up the Intel® Edison compute module.
− When the Intel® Edison device is running, pressing and holding the power button for more than
2 seconds but less than 7 seconds will put the Intel® Edison device into AP (access point) mode. This
action enables the “one-time setup” (same as configure_edison --enableOneTimeSetup).
− When the Intel® Edison device is running, pressing and holding the power button for 10 seconds or
more will cause the Intel® Edison compute module to power down. This is similar to a hard shutdown,
which cuts the power supply to the compute module.
When attaching an Intel® Edison module to breakout board, handle the Intel® Edison module by the PCB edges.
Avoid holding or exerting pressure to the shields. To mate the Intel® Edison board to the breakout board, apply
pressure directly above the connector and to the left corner.
Figure 6 Inserting an Intel® Edison module to the breakout board