LILY-W1 series - System integration manual
UBX-15027600 - R09
Design-in
Page 28 of 64
C1 - Public
•
Minimum board size: 25x35 mm
•
Power planes and signal traces should not cross the layers beneath the module to maximize heat
flow from the module.
Additional hardware techniques can be used to improve the thermal performance of the module in
customer’s applications:
•
Maximize antenna’s return loss to reduce reflected RF power to the module.
•
Improve the efficiency and the thermal design of any component that generates heat in the
application, including power supplies and processor, to spread the generated heat distribution
over the application device.
•
Properly design the mechanical enclosure of the application device to provide ventilation and good
thermal dissipation.
•
For continuous operation at high temperatures, it is recommended to include a heat sink
component on the PCB’s bottom side, connected through electrically insulated / high thermal
conductivity adhesive
2.9
ESD guidelines
LILY-W1 module is manufactured through a highly automated process, which complies with
IEC61340-5-1 [9]
(STM5.2-1999 Class M1 devices) standard. A manufacturing process on
customer’s manufacturing site that implements a basic ESD control program is considered sufficient
to guarantee the necessary precautions
for handling the modules. The ESD ratings of LILY-W1
module pins are stated in Table 17
Applicability
Immunity level
All pins except
ANT
Human Body Model (HBM), ANSA/ESDA/JEDEC JS-001-2014.
±
2000 V
Charged Device Model (CDM), JESD22-C101.
±
500 V
ANT
pin and
Internal antenna
Human Body Model (HBM), ANSA/ESDA/JEDEC JS-001-2014.
±
300 V
Charged Device Model (CDM), JESD22-C101.
±
600 V
Table 17: ESD immunity rating for pins of LILY-W1 module
The designer must implement proper measures to protect from ESD events on any pin that may be
exposed to the end user in compliance with the following European regulations.
•
ESD testing standard CENELEC EN 61000-4-2 [7]
•
Radio equipment standard ETSI EN 301 489-1 [8]
The minimum requirements as per these European regulations are summarized in Table 18:
Application
Category
Immunity Level
All exposed surfaces of the radio equipment and ancillary
equipment in a representative configuration of the end product.
Contact Discharge
4 kV
Air Discharge
8 kV
Table 18: Minimum ESD immunity requirements based on EN 61000-4-2
Compliance with standard protection level as specified in EN 61000-4-2 [7] can be achieved by
including proper ESD protections in parallel to the line, close to areas accessible by the end user.
⚠
Special care should be taken if the ANT or RF switch pins must be protected by choosing an ESD
protection with adequate parasitic capacitance. For 2.4 GHz operation, a protection with
maximum internal capacitance of 0.25 pF is recommended.
11
This is in general not required.
12
Minimum ESD protection level for safe handling is specified in JEDEC JEP155 (HBM) and JEP157 (CDM) for
±
500 V and
±
250
V respectively.