AMY-5M - Hardware Integration Manual
GPS.G5-MS5-08207-A3
Preliminary
Design-in
Page 12 of 54
2.1.4
How to connect the power supply pins
Table 1 lists the power supply pins and their requirements.
Pin
Function
Comments
V_DCDC
Main Core Supply
Always needs input. The current consumption varies over time (peak currents).
Keep series resistance low to prevent ripple on the power supply.
VDD_3V
Main RF Supply
Always needs input.
VDD_IO
I/O Ring Supply
Always needs an external supply
V_BCKP
Backup voltage supply
Connect to GND if not used
VDD_B
Backup Power
Not connected unless using supply capacitors.
VDD_C
Core Power
Connect to external supply capacitor.
VDD_RF
Core Power
Connect only as shown (refer to Figure 4 through Figure 6).
VDD_ANA
Analog Power
Not connected unless using supply capacitors.
VDD_LNA
LNA Power Supply
Not connected unless using supply capacitors.
Table 1: Power Supply Pins
2.1.5
Single 2.5…3.6 V supply
A single 3.0V power supply is very easy to design but is not the most economic solution to run u-blox 5 receivers
(see section 2.1.3 for details).
C
AMY-5
XTAL_IN
XTAL_OUT
V_DCDC
2.5...3.6 V
Main Battery
1.4...3.6 V
Backup Battery
V_BCKP
Crystal
C20
f
XTAL
= 32.768 kHz
Y2
C19
(optional)
V_TH
Connect
to GND
Connect
XTAL_IN
to GND
if no RTC used
VDD_3V
VDD_RF
When connecting
to V_DCDC
a filter is imperative
VDD_B
VDD_C
VDD_ANA
VDD_LNA
VDD_IO
1.65...3.6 V
V_RESET
Supply
Filter
Figure 4: Single 2.5…3.6 V supply (for supply filter see Figure 3).
