Data Sheet

BMD-341 - Data sheet
UBX-19033643 - R03 Page 14 of 36
Using the BMD-341 minimal footprint, with only the additional VCCH pad added, allows BMD-300
designs to gain the following BMD-341 features with typically minor layout re-work:
 Bluetooth 5 long range modes
 IEEE 802.15.4 (Thread and Zigbee) connectivity
 Doubled Flash memory (1 MB vs. 512 KB)
 Quadrupled RAM (256 KB vs. 64 KB)
 ARM® TrustZone® Cryptocell 310 security co-processor
To take advantage of new hardware features, such as the additional UART and Quad SPI interface,
the full BMD-341 footprint should be used. Designs that require the 5V DCDC converter, trace
interface, USB interface, or the additional GPIO (P1.00-P1.15) must use the full BMD-341 footprint.
☞ Since the BMD-300/301/330/360 can be soldered to the full BMD-340/341 footprint, it is
highly recommended that all new BMD-300/301/330/360 and BMD-340/341 projects use the
full
BMD-340/341 footprint. When migrating designs, the full BMD-341 footprint should be used
whenever possible as it is better suited for use with mass production SMT processing. Care
should be taken to follow ground plane and keep-out areas if designing for modules with an
integrated antenna.
2.4 BMD-341 fan-out example
The following figure is a BMD-341 fan-out example on a simple 2-layer PCB. This example is powered
via VCCH from a USB connection. See section 3.3 for details on power and DCDC operation.
Top Layer
Bottom Layer
Figure 6: BMD-341 two-layer fan-out example