LEA-M8S / LEA-M8T - Hardware integration manual
UBX-15030060 - R06
Design
Page 19 of 33
Production information
Figure 13: Schematic of open circuit detection
RF
Vcc
Rbias
R
R
R
I
_
3
2
2
Equation 1: Calculation of threshold current for open circuit detection
☞
If the antenna supply voltage is not derived from VCC_RF, do not exceed the maximum voltage
rating of ANT_DET_N.
2.5
Layout design-in: Thermal management
During design-in do not place the module near sources of heating or cooling. The receiver oscillator is
sensitive to sudden changes in ambient temperature which can adversely impact satellite signal
tracking. Sources can include co-located power devices, cooling fans or thermal conduction via the
PCB. Take into account the following questions when designing in the module.
Is the receiver placed away from heat sources?
Is the receiver placed away from air-cooling sources?
Is the receiver shielded by a cover/case to prevent the effects of air currents and rapid
environmental temperature changes?
