CXA3355ERVQFN SONY [Sony Corporation], CXA3355ERVQFN Datasheet - Page 24

• Manufacturer Part Number: CXA3355ERVQFN
• Description: GPS Down Converter IC
• Manufacturer: SONY [Sony Corporation]

9. Antenna Sense
The power supply lines are separated internally, so antenna sense operation at the supply voltage (V
3.0 ± 0.3V is recommended. Note that the antenna sense function does not operate independently, so
voltage should also be applied to the other power supply pins (V
addition, leave the power supply pin (V
The antenna sense function checks whether an antenna is connected. Pin 2 (DIAG) outputs high voltage
when an antenna is not connected, or low voltage when an antenna is connected. A current limiting circuit
is provided as a countermeasure against short circuits.
The DIAG pin voltage switching point is as shown in the table below.
V1, V2, V3 and Ib in the table below are as follows.
V1: 10 to 60mV
V2: 140 to 200mV
V3: 250mV
Ib: 1.7 to 2.1mA
V1 < Vs < V2
Vs < V1
V2 < Vs
MODE
VA
V
CC
3 (ANT)
Current limiting threshold voltage.
R3
Threshold voltage at which connection of the prescribed load is detected from
the open status
Normal connection
Vs
Base current in the normal connection status.
Connection status
Threshold voltage for switching to the short status from the prescribed load
connected status.
1
3
Open
Short
ASENS
AILIM
Antenna Sense Block Circuit
CC
3) open when not using the antenna sense function.
V
V2
CC
V1
V3
VD
DIAG voltage
3 (ANT)
– 24 –
High
High
Low
A2
A3
A1
CXA3355ER
Ib
I1 = 1.9mA
CC
(Typ.)
1, V
DIAG
CC
2
I1
2) for use in active mode. In
V1
V2
V3
CXA3355ER
Vs
Vs
CC
3) of