CXD2931GA-9 Просмотр технического описания (PDF) - Sony Semiconductor

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производитель

CXD2931GA-9

1 chip GPS LSI

Sony Semiconductor 

CXD2931R-9/GA-9

Application Notes

The constants shown in the circuits below are the examples, and do not quarantee the circuit operation.

1. TCXO input

(1) When inputting the binary-converted signal

The TCXO (Pin 7) input signal should be 18.414MHz ± 3ppm.

Input

7

Open 8

(2) When performing the self-oscillation with the TCXO and XTCXO pins (Pins 7 and 8)

The TCXO (Pin 7) input signal should be 18.414MHz ± 3ppm.

0.01µF

TCXO

7

1MΩ

8

2. CPU clock generation

Pin 32 is used to select that TCXO is used or that the self-oscillation is performed with the MCKI and

MCKO pins (Pins 30 and 31).

(1) TCXO solution (TCXO is used for CPU clock)

Set Pin 32 to low.

Pin 30: Low

Pin 31: Open

(2) When performing the self-oscillation with the MCKI and MCKO pins (Pins 30 and 31)

Set Pin 32 to high.

The crystal frequency should be less than 20MHz.

The following circuit is just a reference, and is not guaranteed.

20pF

30

20MHz max. 10MΩ

31

20pF

– 22 –

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