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STA5620 Scheda tecnica(PDF) 11 Page - STMicroelectronics |
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STA5620 Scheda tecnica(HTML) 11 Page - STMicroelectronics |
11 / 29 page STA5620 Functional description 11/29 3.9 Power control modes Three different power control modes can be chosen by means of the CHIP_EN and the RF_EN pins. If the CHIP_EN pin is forced low the device goes to stand-by mode with very low power consumption. On the other hand, if CHIP_EN is set high, two scenarios are possible: 1. IIf RF_EN = 0 the crystal oscillator and only one output buffer are enabled, XTAL_CLK if MODE = 1 or GPS_CLK if MODE = 0; 2. If RF_EN = 1 the whole chip is active and functional. Only if MODE = 0 the XTAL_CLK output is disabled. A logic reset of the SPI registers is generated by the low to high transitions of the CHIP_EN pin. External pin strapping dominates until some SPI commands reverse the priority and overrides the strapping until next reset. |
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