USGlobalsat EB-5318RE - Manual (Page 4)

2012/8/31 4
1. GPIO is 1.8V Level
2. The ON_OFF pin commands the EB-5318RF ON or OFF. The turn ON command is a
hardware feature of the Power Control FSM when sensing a rising edge on the pin. The turn
OFF command is a software feature based on interrupts related to rising and/or falling edges
and/or sensing of pin levels.
3. The WAKE_UP pin is an output from the EB-5318RF used to enable an external PMIC. A low
on this output indicates that the EB-5318RF is in one of its low-power states (KA-only,
Hibernate, or Standby mode) and requires no more than 60µA of current on the VIO_18 input.
A high on this output indicates that the EB-5318RF is in operational mode requiring an external
regulator to provide enough current on both the VIO_18 and VREG_18 inputs to handle the
peak current requirements of the EB-5318RF
.
4. The DR mode I2C interface provides support for dead reckoning (DR) and code upload. The
port has 2 pins, DR_DIO and DR_CLK, both pins are pseudo open-drain and require pull-up
resistors on the external bus.
Electrical Specification
Absolute Maximums Ratings
Parameter Min. Typ. Max. Conditions Unit
POWER Supply
Main power supply(VCC)
3.1 3.3 3.5 V
Backup battery supply 2.0 3.5 V
45 50 55 GPS is not 3D Fixed. mA
Main power supply Current
35 38 45 GPS is 3D Fixed. mA
RF POWER Supply VCC V
RF Input
Input Impedance
50 Ω
Operating Frequency 1.575 Ghz
DC Electrical characteristics
Parameter Symbol Min. Typ. Max. Conditions Units
High Level Input Voltage V
I H
0.7*VCC 3.6 V
Low Level Input Voltage V
I L
-0.4 0.45 V
High Level Output Voltage V
OH
0.75*Vgcc Vgcc V
Low Level Output Voltage V
OL
0.4 V
High Level Output Current I
OH
2 mA
Low Level Output Current I
OL
2 mA
Vgcc is SiRF Star IV Chip power input, 1.8V Vin.