AC530 Fastrax, AC530 Datasheet - Page 17

• Manufacturer Part Number: AC530
• Description: GPS Development Tools Application Board for UC530
• Manufacturer: Fastrax

Specifications of AC530

• Rohs: yes
• Product: Application Boards
• Tool Is For Evaluation Of: UC530
• Frequency: 1.575 GHz
• Operating Supply Voltage: 3.3 V
• Interface Type: UART
• Description/function: Fastrax Application Board AC530 provides the UC530 connectivity to the Fastrax Evaluation Kit or to other evaluation purposes
• Maximum Operating Temperature: + 85 C
• Minimum Operating Temperature: - 40 C
• Operating Supply Current: 25 mA

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impact on GPS performance is low at modest jamming levels; however at high jammer levels -90… -80 dBm the RF
signal sampling (ADC) starts to get saturated after which GPS signal levels start to reduce.
Note that Jamming Remover is not effective against wide band noise (e.g. from host CPU memory bus), which
cannot be separated from thermal noise floor. Wide band Jamming signal increases effective noise floor and
eventually reduces GPS signal levels.
4.9
The PPS output signal provides pulse-per-second output pulse signal for timing purposes. Pulse length (high state)
is 100 ms and it has 1us accuracy synchronized at rising edge to full UTC second with nominal GPS signal levels.
The PPS will output PPS after a few seconds from first fix after the fix epoch is synchronized to full second.
The PPS output is valid when navigation is valid and will also continue ‘freewheel’ after valid fix is lost by a certain
navigation DR timeout, typ. 10 seconds. User can also enable NMEA $GPZDA message that is sent right after the
PPS pulse just sent.
4.10 Wakeup output
The WAKEUP output voltage provides indication to host that the module is active. Polarity is active high = module
active.
WAKEUP output is intended to drive only CMOS inputs; do not load WAKEUP signal with current exceeding 2mA.
Only loads with steady state current drain is allowed (i.e. loads with ripple currents are prohibited).
4.11 Interrupt input EINT1
The default EINT1 function is Standby mode control but the function is not supported; leave signal floating (not
connected).
4.12 UI_FIX signal
The default UI_FIX function is valid fix indicator output. Without a valid fix the signal is at low state; during valid fix
condition the signal outputs 1 s pulses every 2 seconds.
2012-05-03
UC530_Datasheet
PPS output
Do not load WAKEUP output with current exceeding 2mA. Only loads with steady
state current drain is allowed, i.e. loads with ripple currents are prohibited.
Figure 6 UI_FIX valid fix indicator timing
NOTE