SI4731-D60-EVB Silicon Laboratories Inc, SI4731-D60-EVB Datasheet - Page 29

• Manufacturer Part Number: SI4731-D60-EVB
• Description: BOARD EVALUATION FOR SI473-D60
• Manufacturer: Silicon Laboratories Inc
• Series: -r
• Type: Receiverr

Specifications of SI4731-D60-EVB

• Frequency: 520kHz ~ 1.71MHz, 64MHz ~ 108MHz
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant
• For Use With/related Products: SI4731

4.21. GPO Outputs
The Si473x provides three general-purpose output pins.
The GPO pins can be configured to output a constant
low, constant high, or high-impedance. The GPO pins
can be reconfigured as specialized functions.
4.22. Firmware Upgrades
The Si473x contains on-chip program RAM to
accommodate minor changes to the firmware. This
allows Silicon Labs to provide future firmware updates
to optimize the characteristics of new radio designs and
those already deployed in the field.
4.23. 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.
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
while keeping the bus active.
4.24. 2 V Operation (SSOP Only)
The Si473x-D60 is capable of operating down to 2 V as
the battery drains in an application. Any power-up or
reset is not guaranteed to work below the dc
characteristics defined in Table 3. This capability
enables a much longer run time in battery operated
devices.
Rev. 1.0
4.25. Programming with Commands
To ease development time and offer maximum
customization, the Si473x provides a simple yet
powerful software interface to program the receiver. 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 an action such
as powerup the device, shut down the device, or tune to
a station. Arguments are specific to a given command
and are used to modify the command.
Properties are a special command argument used to
modify the default chip operation and are generally
configured immediately after powerup. Examples of
properties are de-emphasis level, RSSI seek threshold,
and soft mute attenuation threshold.
Responses provide the user information and are
echoed after a command and associated arguments are
issued. All commands provide a 1-byte status update,
indicating interrupt and clear-to-send status information.
For a detailed description of the commands and
properties for the Si473x, see “AN332: Si47xx
Programming Guide.”
Si4730/31/34/35-D60
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