USGlobalsat EB-5318RE - Manual (Page 7)

2012/8/31 7
Application
Application Circuit
GPS Active Antenna Specifications (Recommendation)
Frequency: 1575.42 + 2MHz Amplifier Gain: 18~22dB Typical
Axial Ratio: 3 dB Typical Output VSWR: 2.0 Max.
Output Impedance: 50Ω Noise Figure: 2.0 dB Max
Polarization: RHCP Antenna Input Voltage: 3.3V (Typ.)
NOTE:
1. RESET: Low Active, when EB-5318RF is accepted this single, EB-5318RF going to Hibernate
mode. If want EB-5318RF up, need input ON_OFF single.
2. TIMEMARK: One pulse per second output. When EB-5318RF is 3D Fixed, this pin will output
1uS Hi level pulse. If don’t use this, just NC.
3. ECLK: ECLK clock input for frequency aiding applications or as a test clock. If don’t use this,
just NC.
4. GPIO: User can use this I/O pin for special functions. For example, control LED, and can be
used External Interrupts. If don’t use this, just NC.
5. WAKE_UP: EB-5318RF power on, WAKE_UP will output 1.8V.
6. ON_OFF: This pin is controlled EB-5318RF power on. If EB-5318RF want to EB-365 pin to pin
compactable, please ON_OFF connect to WAKE_UP. If don’t use this, just NC.
7. DR I2C interface: The I2C interface supports required sensor instruments such as gyros,
accelerometers, compasses or other sensors that can operate with an I2C bus. If don’t use
this, just NC.
8. VBAT: This is the battery backup power input for the SRAM and RTC when main power is
removed. VBAT is 2V ~ 3.5V.