CXD2931GA-9 View Datasheet(PDF) - Sony Semiconductor

Part Name

Description

Manufacturer

CXD2931GA-9

1 chip GPS LSI

Sony Semiconductor 

CXD2931R-9/GA-9

Description of Application Circuit

See the Application Circuit when using the CXD2931R-9/GA-9 to configure a GPS receiver.

Points for caution are as follows.

1. Unused pins

Software processing is performed to prevent undesired current from flowing to unused pins in the circuit

diagram, so leave these pins open.

2. TCXO input

The TCXO frequency is 18.414MHz ± 3ppm. Signals that have not been binary-converted should be input

via a DC filter capacitor (C19 in the circuit diagram). Input binary-converted signals directly to Pin 7 (TCXO)

without passing through C19 or R1 in the circuit diagram.

Make sure the input level at this time satisfies the Electrical Characteristics.

3. IF input

The CXD2931R-9/GA-9 interface is 1.023MHz, and does not accept other frequencies. Signals that have

not been binary-converted should be input via a DC filter capacitor (C20). Input binary-converted signals

directly to Pin 18 (IF0) without passing through C20 or R3 in the circuit diagram.

Make sure the input level at this time satisfies the Electrical Characteristics.

4. TXD (SIO output)

The TXD amplitude low level is 0.4V or less, and the high level is VDD – 0.4V (VDD = 3.0 to 3.6V) or more.

When the LSI, etc., connected to TXD operates at 5V and has a CMOS input level, perform 3 to 5V

conversion before inputting the signal.

5. Real-time clock

The current software version uses an external real-time clock. Consult your Sony representative

beforehand when using the internal real-time clock. When using an external real-time clock, connect Pin 13

(CCKI) to GND.

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