CXD2951GA-4 データシートの表示（PDF） - Sony Semiconductor

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CXD2951GA-4

Single Chip GPS LSI

Sony Semiconductor 

CXD2951GA-4

Initialization

The CXD2951GA-4 is initialized by setting the reset signal EXRS (Pin 151) to the low level. Note that internal

RAM is not initialized by the operation. Satisfy the conditions shown below for the timing and others.

1. When turning the power on (Power-on reset)

VDD

VDD [V]

Power supply,

EOSCEN

(Pin 119)

100ms or more

EXRS (Pin 151)

VDD/2

GND

The power supply both 3.3V and 1.8V should turn on simultaneously, and EOSCEN (Pin 119) should also rise

simultaneously with the power supply turning on. EXRS (Pin 151) should rise 100ms or more after the power

supply and EOSCEN rise.

2. Initialization during operation

VDD

VDD [V]

Power supply,

EOSCEN

(Pin 119)

100µs or more

EXRS (Pin 151)

VDD/2

GND

For initialization during operation, the interior circuit except internal RAM is initialized by setting the EXRS

(Pin 151) signal to the low level for 100µs or more. Note that internal RAM is not also initialized by the

operation. At this time, the EOSCEN (Pin 119) signal should keep the high level.

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