SI4701 datasheet(6/42 Pages) SILABS

No de pièce	SI4701

Description	Device initialization sequence and busmode selection

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Fabricant	SILABS [Silicon Laboratories]

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AN230

6

Rev. 0.9

2. Set the ENABLE bit high and the DISABLE bit high to place the device in powerdown mode. Note that all

register states are maintained so long as VIO is supplied and the RST pin is high.

3. Remove VA and VD supplies as needed.

To power up the device (after power down):

1. Si4703-C19 Errata Option 1: Perform a hard reset of the tuner by following steps 2, 3, and 4 of 2.1.1 Hardware

Initialization.

2. Note that VIO is still supplied in this scenario. If VIO is not supplied, refer to device initialization procedure above.

3. Supply VA and VD.

4. 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. There are two methods for selecting the

bus mode. Method one uses the SEN and SDIO pins while method two uses GPIO1 and GPIO3 (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 11.

Figure 2. Powerup, Powerdown, and Reset State Diagram

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

Si4703-C19 Errata: Ensure RDSD

register is zero before enabling.

VA Optional

VD Optional

VIO Required

RCLK Optional

Device Status

Power Supply Status

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