
Bx600 Series of Breakout Boards for BL600 module
User Guide
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4.2.1
External Supply 3.6V or Less
J4 (pin1) can be used to connect an external 3.6V supply when the CR1632 coin cell is not supported or not in
use.
Note:
J4 (2.0 mm pitch, 2-pin) header is not fitted (J4 pin 1 and pin 2 can be accessed through PTH holes)
on any version of the BL600 breakout board. Note that the square pad is pin 1, and the circular pad
is pin 2.
Figure 25: J4 pins 1 and 2
BA600 and BC600 come with components D1 and C3 fitted for the coin cell battery and no changes are required
to support an external supply input at connector J4, coin cell MUST be removed. The diode, D1, can provide
reverse current protection for the external supply while C3 can reduce VCC supply drops during BL600 radio
operation.
The BB600 breakout board must have a regulated external supply capable of handling the demands of the BL600
radio during transmission bursts. If there is any concern, C3 can be placed to help stabilize VCC during radio
transmissions, otherwise C3 should not be fitted and a short should be placed across the D1 component pads.
The positive (VCC) supply lead will connect to J4 (pin1) and the common or ground (GND) supply lead will
connect to J4 (pin2).
4.2.2
External Supply Greater than 3.6V
This is the use case where customer has external system VCC greater than 3.6V on any of the BL600 breakout
board revisions:
WARNING: If customer decides to use an off the shelf FTDI cable, such as
FTDI TTL-232R-3V3
which comes
with a 6-pin (2.54mm pitch) connector compatible with the J3 pitch and pinout, pin 3 of this
cable has 5V present on pin3. Connecting the TTL-232R-3V3 FTDI cable from the USB port into J3
including pin 3 on the BA600-0x, BB600-0x or BC600-0x breakout board will damage the BL600
module due to over-voltage at the VCC input.
Alternatively, the below FTDI cables are safe (3.3V on pin3) to plug into J3 on the board:
TTL-232RG-VSW3V3-WE: 3.3V VCC/TTL --> Wire Ended
TTL-232RG-VREG3V3-WE: 3.3V VCC/TTL --> Wire Ended
For BL600 VCC operated at 1.8V operation, below FTDI cable:
TTL-232RG-VREG1V8-WE: 1.8V VCC/TTL --> Wire Ended
J4 pin 1 (VCC) – Square pad
J4 pin 2 (GND)