SI4713-B30-GMR【PDF 29/42 页】IC TX FM RADIO RPS/RDS 20UQFN

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Si4712/13-B30

Rev. 1.1

recommended that the user keep SEN

low until all bytes

have transferred. However, it will not disrupt the

protocol if SEN

temporarily goes high at any time, as

long as the user does not change the state of SCLK

while SEN

is high. After 16 bytes have been read, the

user raises SEN

after the last falling edge of SCLK to

end the transaction.

At the end of any SPI transaction, the user must drive

SEN

high after the final falling edge of SCLK. At any

time during a transaction, if SEN

is sampled high by the

device on a rising edge of SCLK, the transaction will be

aborted. When SEN

is high, SCLK may toggle without

affecting the device.

For details on timing specifications and diagrams, refer

to Figure 6 and Figure 7 on page 10.

5.12.3. 3-Wire Control Interface Mode

When selecting 3-wire mode, the user must ensure that

a rising edge of SCLK does not occur within 300 ns

before the rising edge of RST

3-wire bus mode uses the SCLK, SDIO and SEN

pins.

A transaction begins when the system controller drives

SEN

low. Next, the system controller drives a 9-bit

control word on SDIO, which is captured by the device

on rising edges of SCLK. The control word is comprised

of a three bit chip address (A7:A5 = 101b), a read/write

bit (write = 0, read = 1), the chip address (A4 = 0), and a

four bit register address (A3:A0).

For write operations, the control word is followed by a

16-bit data word, which is captured by the device on

rising edges of SCLK.

For read operations, the control word is followed by a

delay of one-half SCLK cycle for bus turnaround. Next,

the Si4712/13 drives the 16-bit read data word serially

on SDIO, changing the state of SDIO on each rising

edge of SCLK.

A transaction ends when the user sets SEN

high, then

pulses SCLK high and low one final time. SCLK may

either stop or continue to toggle while SEN

is high.

In 3-wire mode, commands are sent by first writing each

argument to register(s) 0xA10xA3, then writing the

command word to register 0xA0. A response is

retrieved by reading registers 0xA80xAF.

For details on timing specifications and diagrams, refer

to Table 6, 3-Wire Control Interface Characteristics, on

page 9, Figure 4, 3-Wire Control Interface Write Timing

Parameters, on page 9, and Figure 5, 3-Wire Control

Interface Read Timing Parameters, on page 9.

5.13. GPO Outputs

The Si4712/13 provides three general-purpose output

pins. The GPO pins can be configured to output a

constant low, constant high, or high-Z. The GPO pins

are multiplexed with the bus mode pins or DCLK

depending on the application schematic of the

transmitter. GPO2/INT

can be configured to provide

interrupts.

5.14. Reset, Powerup, and Powerdown

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 and place it in powerdown mode.

A powerdown mode is available to reduce power

consumption when the part is idle. Putting the device in

powerdown mode will disable analog and digital circuitry

and keep the bus active. For more information

concerning Reset, Powerup, Powerdown, and

Initialization, refer to AN332: Universal Programming

Guide.

5.15. Programming with Commands

To ease development time and offer maximum

customization, the Si4712/13 provides a simple yet

powerful software interface to program the transmitter.

The device is programmed using commands,

arguments, properties, and responses.

To perform an action, the user writes a command byte

and associated arguments causing the chip to execute

the given command. Commands control actions, such

as powering up the device, shutting down the device, or

tuning to a station. Arguments are specific to a given

command and are used to modify the command. For

example, after the TX_TUNE_FREQ command,

arguments are required to set the tune frequency. A

complete list of commands is available in Table 17,

Si471x Command Summary, on page 30.

Properties are a special command argument used to

modify the default chip operation and are generally

configured immediately after powerup. Examples of

properties

are

TX_PREEMPHASIS

and

GPO_CONFIGURE. A complete list of properties is

available in Table 18, Si471x Property Summary, on

page 31.

Responses provide the user information and are

echoed after a command and associated arguments are

issued. At a minimum, all commands provide a one-byte

status update indicating interrupt and clear-to-send

status information. For a detailed description of using

the commands and properties of the Si4712/13, see

AN332: Universal Programming Guide.

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