ORG4572-R01-UAR datasheet(24/40 Pages) ETC

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Multi Spider - ORG4572 Datasheet

Revision 3.0

November 23, 2014

17.2. POWER SUPPLY

It is recommended to keep the power supply on all the time in order to maintain RTC block active and

keep satellite data in RAM for fastest possible TTFF.

When VCC is removed settings are reset to factory default and the receiver performs Cold Start on next

power up.

17.2.1. VCC

VCC is 1.8V ±5% DC and must be provided from regulated power supply.

Inrush current is up to 150mA for about 20µs duration, VCC can be dropped down to 1.66V.

Typical ICC during acquisition is 55mA on R01 standard ordering option.

Lower acquisition current is possible disabling GLONASS radio path by software command.

During tracking the processing is less intense compared to acquisition, therefore power

consumption is lower.

Maximum ICC current in Hibernate state is 54µA, while all I/O lines externally held in Hi-Z state.

Output capacitors are critical when powering ORG4572 from switch-mode power supply.

Filtering is important to manage high alternating current flows on the power input connection.

An additional LC filter on ORG4572 power input may be needed to reduce system noise.

The high rate of ORG4572 input current change requires low ESR bypass capacitors.

Additional higher ESR output capacitors can provide input stability damping.

The ESR and size of the output capacitors directly define the output ripple voltage with a given

inductor size. Large low ESR output capacitors are beneficial for low noise.

Voltage ripple below 50mVPP allowed for frequencies between 100KHz to 1MHz.

Voltage ripple below 15mVPP allowed for frequencies above 1MHz.

Higher voltage ripple may compromise ORG4572 performance.

17.2.2. GROUND

Ground pads must be connected to host PCB Ground with shortest possible traces or vias.

17.3. RF INPUT

RF input impedance is 50Ω, DC blocked up to ±25V.

Multi Spider ORG4572, supporting active or passive antennas.

17.3.1. PASSIVE ANTENNA

R01 standard ordering option incorporating dual-stage LNA is highly recommended for design

with passive antenna, due to it’s ultimate sensitivity.

Short trace of 50Ω controlled impedance should conduct GNSS signal from antenna to RF_IN pad.

In design with passive antenna attention should be paid on antenna layout.

17.3.2. ACTIVE ANTENNA

Active antenna net gain including conduction losses should not exceed +25dB.

DC bias voltage for active antenna can be externally applied on RF_IN trace through bias-T.

DC bias voltage can be controlled by WAKEUP output through MOSFET or load switch.

In design with external LNA power enable can be controlled by ORG4572 WAKEUP output that

by following module’s power states assists reducing overall system current consumption.

17.4. CONTROL INTERFACE

17.4.1. ON_OFF

ON_OFF input is used to switch ORG4572 between different power states:

While in Hibernate state, an ON_OFF pulse will initiate transfer into Full Power state.

While in ATP™ mode, an ON_OFF pulse will initiate transfer into Full Power state.

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