sc14wsmdata Dialog Semiconductor, sc14wsmdata Datasheet - Page 23

• Manufacturer Part Number: sc14wsmdata
• Description: Ultra Low Energy Wireless Sensor Module V1.0
• Manufacturer: Dialog Semiconductor

© 2011 Dialog Semiconductor B.V/
• URX input to module B9 to pin 4 on header.
• GND connection to pin 5 on header.
6.1.3
Test points and debugging features can be used during
debugging. The following connections are
recommended:
• Header option between VBAT (F6/B10) and
• Header option, switch or digital input to apply
• Test point option to probe buffered XTAL clock
• Test point option to point D3 (Power ON button for
6.1.4
The following connections are recommended:
• Switch, digital output or trigger signal to ULE_PORT
The following connections are optional:
• ADC connections (shown with resistive divider
• LED indicators (shown to LED current sources at K8
• GPIO connections to P3[2-7] or pins K3, G4, K5, J4,
• High output drive GPIO connection to P3[0-1] or pins
6.1.5
• Because of the presence of the digital radio
• Power supply considerations
VBATSW (C11) to override sleep mode in
Hardware.
external reset. HW reset can be issued by pulling
RSTn (A11) to GND or low.
output on C4.
module) to have HW power-on override.
input (F5) to trigger wake up. The ULE_PORT can
also be used as an output but then external events
can not wake up the system (timer based only).
scaling option to ADC0 (G4) and ADC1 (F2)).
and J8).
K4, H3 respectively.
C2, D2 respectively.
frequency burst with 100 Hz time division periods
(TDD noise), supply ripple and RF radiation, special
attention is needed for the power supply and ground
PCB layout.
Both high and low frequency bypassing of the supply
line connections should be provided and placed as
close as possible to the SC14WSMDATA. In order to
get the best overall performance a number of
considerations for the PCB has to be taken into
account.
• The width of VBAT and VDDPA supply line is rec-
• Make angle breaks on long supply lines to avoid
ommended to be between 0.8 and 1.2 mm due to
high current peaks during RF bursts.
resonance frequencies in respect to DECT fre-
quencies. Maximum 8 cm before an angle break
is recommended.
Test points and debugging features
Interfacing
PCB Design Guidelines
Company Confidential
23
• ESD performance
6.2
In order to ensure proper coverage and to avoid de-
tuning of the antennas, it is very important to place the
module free on the main board in relation to other
surrounding materials.
As a "rule of thumb", keep a distance of at least 10 mm
from the antenna elements to conducting objects and
at least 5 mm to non-conducting objects - depending of
the size. Keep in mind that electrical shielding objects,
even partly surrounding the antennas, will normally
cause a significant degradation of the coverage.
Place the module at the corner of the main-board as
shown in Figure 9. If the module has to be placed away
from the edge of the main-board, then avoid
conducting areas in front of the antennas.
Note: There should be no PCB material under the
antennas. If the module is not placed at the corner of
the PCB a cut-out must be made in the main board
underneath the antennas as shown in the figure.
Keep solid ground on layer 2 out to the edges of the
main board as shown in the figure.
• Supply lines should be placed as far as possible
• Ground plane considerations
Besides TDD noise, the ESD performance is
important for the end-application. In order to achieve
a high ESD performance supply lines should be
placed with a large distance from other electrical
terminals with direct contact to the ESD source.
On a two-layer PCB application it is important to
keep a simulated one layer ground. With a stable
ground ESD and TDD noise performance will always
improve.
away from sensitive circuits. If it is necessary to
cross supply lines and sensitive lines, it should be
done with right angles between supply and sensi-
tive lines/circuits.
In order to achieve the best audio performance
and to avoid the influence of power supply noise,
RF radiation, TDD noise and other noise sources,
it is important that sensitive circuits on applica-
tions boards are connected to a star GND connec-
tion (connected to the SC14WSMDATA GND
pins) with separate nets in the layout.
MODULE PLACEMENT ON THE MAIN BOARD
Preliminary December 4, 2012 v1.0