CXD2951GA-4 Просмотр технического описания (PDF) - Sony Semiconductor

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CXD2951GA-4

Single Chip GPS LSI

Sony Semiconductor 

CXD2951GA-4

Backup Mode

The backup mode is established by setting both EOSCEN and EXRS low. In this mode, the low power

consumption can be achieved by stopping all oscillators except for RTC oscillator during the reset interval.

Although all registers are initialized, the SRAM contents in backup area are held.

In order to cancel this mode (reset cancellation), set EOSCEN high at first and then set EXRS high after the

oscillation stabilization time and PLL lock time have passed. It needs 100ms or more.

See Initialization section.

Normal operation

Backup

Reset

Normal operation

IOVDD

CVDD

BKUPIOVDD

BKUPCVDD

OSC, PLL output

EOSCEN

EXRS

ED[31:0], EPORT[12:0], ERXD0

ETXD0

EXCS[1:0], EXWE[3:0], EXOE

EA[19:0], ECLKOUT

Power Off

Power Off

Power Off

Power Off

Oscillation stabilization time PLL lock time

(0.5ms max.)

Pull-down output

Hi-Z output

High output

Low output

– 17 –

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