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SI4708 Datasheet(PDF) 9 Page - Silicon Laboratories |
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SI4708 Datasheet(HTML) 9 Page - Silicon Laboratories |
9 / 14 page AN349 Rev. 0.1 9 Figure 4. Powerup Timing Table 4 shows the sequence of commands required to powerdown the device. The tuner can optionally be programmed to place the audio output pins into a high impedance state. If this is desired, set the AHIZEN bit in register 07h prior to setting the disable bit. See AN230, Section "3.2.3.AHIZEN (07h.14)—Audio High-Z Enable" on page 10 for more information. Set Register 4 [5:4] and [1:0] to 10b prior to setting the disable bit. Table 3. Powerup Configuration Sequence Write address 02h (required). Set the DMUTE bit to disable mute. Optionally mute can be disabled later when audio is needed. Set the ENABLE bit high to set the powerup state. Set the DISABLE bit low to set the powerup state. Example: Write data 4001h. Wait for device powerup (required). Refer to the Powerup Time specification in Table 7 "FM Characteristics" of the data sheet. Read addresses 00h–01h (optional). The bits PN[3:0] = 1 indicate the part family: Si4708/09. The bits MFGID[11:0] = 242h indicate Silicon Laboratories as the manufacturer. The bits REV[5:0] = 1 indicates silicon revision B. The bits DEV indicate the identity of the device: DEV = 0010 after powerup = Si4708. DEV = 1010 after powerup = Si4709. The FIRMWARE bits indicate the firmware revision after powerup. Read addresses 02h-0Fh (optional) Storing the values of each of the 16 registers locally is recommended to simplify manipulation of register bits and to reduce the number of reads/writes to the I/O bus. These are referred to as the shadow registers and can be stored in a 16 word array, shadow_reg[]. Example: To write bit 15 of register 07h after power up, write 07h as shadow_reg[0x07] ^ 0x8000 Write remaining hardware configuration registers (required). Write the general configuration registers (required). Write the regional configuration registers (required). These registers can be programmed in any order. WR02 RD01 ENABLE = 1 DISABLE = 0 DEV = ? Optional Required See Powerup Time in data sheet RD02-0F |
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