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SI4708 датащи(PDF) 5 Page - Silicon Laboratories |
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SI4708 датащи(HTML) 5 Page - Silicon Laboratories |
5 / 14 page AN349 Rev. 0.1 5 3. Remove VA and VD supplies as needed. To power up the device (after power down): Note: VIO is still supplied in this scenario. If VIO is not supplied, refer to 2.1.1. "Hardware Initialization” 1. Supply VA and VD. 2. Set the ENABLE bit high and the DISABLE bit low to powerup the device. Setting the RST pin low will disable analog and digital circuitry, reset the registers to their default settings, and disable the bus. Setting the RST pin high will bring the device out of reset, place the device in powerdown mode, and latch which bus mode will be used to communicate with the device. The bus mode selection is determined by the SENB pin. To select 2-wire operation, the SENB pin must be sampled high by the device on the rising edge of RST. To select 3-wire operation, the SENB pin must be sampled low by the device on the rising edge of RST (See Figure 3). Please refer to the data sheet for more information regarding bus selection and timing requirements of the RST signal. More details on the register access during powerup and powerdown can be found in Section "3.2.1.ENABLE (02h.0)/DISABLE (02h.6)—Powerup Control" on page 8. Figure 2. Powerup, Powerdown, and Reset State Diagram Note: See data sheet for further details. Powerdown Read: ENABLE = 0 DISABLE = 0 Inactive Registers reset to default values Bus Inactive Powerup Read: ENABLE = 1 DISABLE = 0 Partial Powerdown Read: ENABLE = 0 DISABLE = X RST = VIO Write: ENABLE = 1 DISABLE = 0 Write: ENABLE = 0 DISABLE = X Write: ENABLE = 1 DISABLE = 0 Write: ENABLE = 1 DISABLE = 1 RST = GND VA Optional VD Optional VIO Optional RCLK Optional VIO must be supplied prior to the rising edge of reset VA Optional VD Optional VIO Required RCLK Optional VA, VD, and RCLK must be supplied prior to writing ENABLE = 1 VA Required VD Required VIO Required RCLK Required VA Optional VD Optional VIO Required RCLK Optional Device Status Power Supply Status |
Аналогичный номер детали - SI4708 |
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Аналогичное описание - SI4708 |
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