This page provides everything needed to develop a breakout board for a Zigbit module. The Zigbit module is a Zigbee compliant wireless module from Atmel available in chip antenna or balanced RF output variants. This breakout board enables firmware development for the ATZB-24-A2 chip antenna version of the Zigbit module.
At a Glance
- Breaks out every pin of the Zigbit to 0.1" headers
- 50 mil JTAG interface for easy programming/debugging
- General purpose tactile switch
- 4 General purpose LEDs
- Multiple power-up options
- External supply voltage and 3.3V breakout pins
- Easy connection to FTDI cable (768-1015-ND) for power-up and UART communication
- 2.165 x 2.913 inch board outline
This board breaks out every pin of the Zigbit module for complete evaluation. General purpose button and LEDs are also broken out to provide flexibility for the user to select which GPIO pins to use instead of dedicating a pin directly on the PCB. The 50 mil JTAG header interfaces directly with a JTAGICE3 programmer/debugger kit from Atmel. The user is able to power the board either from an external 3.3V source, or an external 4~20V source. Another 0.1" header allows a user to power the device and have access to the UART port using an FTDI USB/UART cable (768-1015-ND). The 5.0V from the USB can be used to power the device and provide 5.0V and 3.3V breakout pins. PCB design recommendations from the Zigbit datasheet were incorporated to provide optimal range for the device.
Figure 1 below shows a schematic view of the breakout board.
Figure 1: Zigbit Breakout Board Schematic
Figures 2 and 3 show the top and bottom PCB layout of the board, respectively. Dimensions are given in inches. Note: The bottom view is shown as "looking through" the board from the top. In reality, the copper would be mirrored if the board was flipped to view the bottom traces.
Figure 2: Top View PCB Layout Figure 3: Bottom View PCB Layout
The Gerber and Drill files for this board can be downloaded below.
PCB Artist was used to develop the schematic and PCB layout for this board. PCB Artist has numerous tutorials available and is fully integrated with Advanced Circuits to order boards with short turn-around.
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PCB Artist can be downloaded for free here.
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The PCB Artist project for this board can be viewed and adjusted here.
Complete Bill of Materials (BOM)
Table 1 shows a complete BOM for the compenents on the board.
Table 1: Bill of Materials
DK Part #
Manuf Part #
CAP CER 10UF 16V 10% X5R 0805
CAP CER 1UF 16V 10% X7R 0805
D1, D2, D3, D4
LED 2X1.2MM 640NM RD WTR CLR SMD
TVS ARRAY ESD/CDE PROT SLP1006P2
CONN FEMALE 18POS .100" R/A GOLD
CONN HEADER FEMALE 6POS .1" GOLD
CONN HEADER 10POS DUAL SHRD SMD
CONN HEADER R/A SGL 6POS GOLD
FERRITE CHIP 1K OHM 350MA 0805
R1, R2, R3, R4
RES 180 OHM 1/8W 1% 0805 SMD
RES 100K OHM 1/8W 1% 0805 SMD
RES 300 OHM 1/8W 1% 0805 SMD
SWITCH TACTILE SPST-NO 0.05A 12V
MOD 802.15.4/ZIGB 2.4GHZ CHIPANT
IC REG LDO 3.3V .15A SOT23-3
Table 2 shows some additional items that may be beneficial for evaluation.
Table 2: Additional Items
DK Part #
Manuf Part #
BUMPON 7.9MM-2.2MM 1 SHT=144PCS
Rubber feet to keep modules stationary (comes in sheet of 144)
CABLE USB EMBD UART 3.3V .1"HDR
Provides USB-UART bridge for communication between PC and Zigbit
WIRE SET 140PC FOR BOARD
Jumper wire kit
AVR ON-CHIP D-BUG SYSTEM
Programmer/Debugger for AVR microcontrollers
HOLDER BATT 4-AA CELLS WIRE LDS
AA battery holder
SNAPS 9V 6" LEADS I-STYLE
9V battery connector
BATTERY IND ALKALINE AA
AA battery 2-pack
BATTERY IND ALKALINE 9 VOLT
Table 3 shows some alternative breakout solutions for the board.
Table 3: Alternative Breakout Solutions
DK Part #
Manuf Part #
CONN HEADER FMALE 18POS .1" GOLD
Upright solution for J1, J2
CONN HEADER 18POS .100 STR TIN
Upright male pin header solution for J1, J2 (bread boarding)
CONN FEMALE 6POS .100" R/A GOLD
Right angle solution for J3, J4
J3, J4, J6
CONN HEADER 6POS .100 STR 15AU
Upright male pin header solution for J3, J4, J6
LED to GPIO Pin
Figure 4 shows how to connect LED1 to GPIO0 of the Zigbit Module. This creates an active low LED connection accessible from firmware.
Figure 4: LED to GPIO0 Connection
Figure 5 shows how to connect the general purpose button to function as a RESET button. When the button is pressed, SW1 is tied to ground. This creates a firmware independent RESET button.
Figure 5: RESET Button
Power Board from External 4.0~20.0V Source
Figure 6 illustrates how to power the board from an external supply between 4.0 and 20.0V. In this configuration, 3.3V will be available at the respective breakout pin.
Figure 6: Power Board from External 4~20V
Power Board from External 3.3V Supply
Figure 7 shows how to power the board from external 3.3V supply. The Vsupply (5V) breakout pin will display approximately 3V in this configuration.
Figure 7: Power Board from External 3.3V Supply
Power Board and Connect to UART Using FTDI Cable
Figure 8 shows how to power the board through a USB port using an FTDI cable (768-1015-ND). This connection option also allows direct connection to the UART port of the Zigbit module. In this configuration, 5.0V and 3.3V will be present at the respective breakout pins. The reverse biased diode prevents damage to the Zigbit module in the event the cable is connected backwards.
Figure 8: Power and Communicate with FTDI Cable
Breakout Board Photos
Figure 9 shows a picture of the finished board with all of the components populated. With the configuration shown in the photo, the general purpose button is connected as a RESET button, and LED1 is connected to GPIO0 of the Zigbit module as a firmware accessible active low LED. The photo shows how the FTDI cable can be used to power the board through a USB port and communicate directly with the devices UART port. A JTAGICE3 is connected to the device through the 50 mil header. Pin assignment printouts were applied to the board for convenience, however, silkscreening is available through Advanced Circuits.
Figure 9: Photo of Zigbit Breakout Board
Figure 10 shows how 4 AA batteries can be connected to power the device (see Fig. 6). As in Fig. 9, the button is configured as a RESET signal and LED1 is connected to GPIO0 of the Zigbit module. In this configuration, 3.3V is available on the breakout pin.
Figure 10: AA Battery Powered Device
Figure 11: Shows how the device can be powered from a 9V battery. It displays the same LED and RESET button configuration. Again, 3.3V is available on the 3.3V breakout pin.
Figure 11: 9V Battery Powered Device
For questions regarding this breakout board or the Zigbit module, contact the author at:
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