Electrical specification – USGlobalsat EB-5318RE User 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.