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전자부품 데이터시트 검색엔진 |
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전자부품 데이터시트 검색엔진 |
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SI4012-C1001GT 데이터시트(PDF) 11 Page - Silicon Laboratories |
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SI4012-C1001GT 데이터시트(HTML) 11 Page - Silicon Laboratories |
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11 / 50 page  Si4012 Rev 1.1 11 4.4. Operating Mode Control Figure 3. State Machine Diagram Transition Notes 1. Transition to any state (including SHUTDOWN) using the CHANGE_STATE command. Alternatively, transition to SHUTDOWN using the SDN pin. 2. If a CHANGE_STATE command to the XO TUNE state is issued (even if already in the XO TUNE state), then an XO TUNE operation is carried out immediately. This enables close control of timing (fastest execution) for a subsequent TX_START command. In the TUNE state, a tune operation is carried out in the interval specified in TUNE_INTERVAL. 3. Transition to end state specified in the TX_START command or TX_STOP command. 4. If coming out of the SHUTDOWN via SMBus, an SMBus “wake-up” byte is required. This byte is discarded, and normal SMBus communication can proceed after the power on reset (ipor) is asserted to the host. State Descriptions The Si4012 has six power modes, which are summarized below. Further details on the IC configuration in these modes can be found in "5.1.5. COMMAND: CHANGE_STATE" on page 22. SHUTDOWN —Lowest current consumption; the majority of hardware blocks are powered down. STANDBY —Low power state with fast SMBus response. SENSOR —Same as STANDBY, but the battery is measured periodically. TUNE —Periodic tuning state. A tune is performed on any CHANGE_STATE to TUNE command and then periodically based on the interval defined in TUNE_INTERVAL. This provides faster transition to TX. If XO is enabled, XO will be used during tune operation. TX —Transmission state. TUNE with XO 5 SDN=1? STANDBY 2 TX 6 SENSOR 3 NOTE1, 2 TUNE without XO 4 XO in CHIP_CONFIG? Yes No NOTE1 NOTE1 NOTE1 NOTE1, 3 SHUTDOWN 1 SMBus or SDN (NOTE 4) Yes CHANGE_STATE CHANGE_STATE / Tx_START TX_START TX_START No |
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