AN2707 Freescale Semiconductor / Motorola, AN2707 Datasheet - Page 11

• Manufacturer Part Number: AN2707
• Description: Software Drivers for Tango3 RF Transmitter and Romeo2 RF Receiver ICs
• Manufacturer: Freescale Semiconductor / Motorola

Tango3 MCU
Resources
MOTOROLA
NOTE:
NOTE:
Software Drivers for Tango3 RF Transmitter and Romeo2 RF Receiver ICs
BAND — This signal sets the operating band for Tango3, which defines the RF
carrier frequency. This signal is usually hard-wired to a particular value but can
also be controlled by the MCU. At logic 1, the RF carrier frequency is set to 32
times the Tango3 crystal frequency; at logic 0, the RF carrier frequency is set
to 64 times the Tango3 crystal frequency.
The software driver can be configured to use or ignore BAND. BAND can be
hard-wired to Vdd or ground if the carrier frequency is fixed.
Pull-up or pull-down resistors are required only if the MCU is required to
override the hard-wired values.
MODE — This signal sets the modulation mode for Tango3. This signal is
usually hard-wired to a particular value, but can also be controlled by the MCU.
When MODE is at logic 1, FSK modulation is selected; when MODE is at logic
0, OOK modulation is selected.
The software driver can be configured to use or ignore MODE. MODE can be
hard-wired to Vdd or ground if the modulation mode is fixed.
Pull-up or pull-down resistors are required only if the MCU is required to
override the hard-wired values.
ENABLEPA — This signal is present on Motorola's Tango3 RF evaluation
module. It allows the MCU to control an additional amplifier stage to boost the
RF transmit power. When ENABLEPA is at logic 1, the power amplifier is
enabled; when at logic 0, the power amplifier is disabled. The software driver
can be configured to use or ignore ENABLEPA.
The Tango3 driver requires the following minimum MCU resources.
The following MCU resources may also be used.
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One timer channel and its associated I/O pin used in output compare
mode. The interrupt vector for this timer channel will also be used. The
timer channel is connected to Tango3's DATA pin.
The Tango3 driver will set the modulus value for the timer associated
with the timer channel chosen.
One I/O pin connected to Tango3's ENABLE pin. This allows the MCU
to enable/disable Tango3, which can be useful for reducing current
consumption in an application. Alternatively, the designer could tie the
ENABLE pin directly to Vdd to permanently enable Tango3.
One timer channel configured as a clock input and connected to
Tango3's DATACLK pin. (Some HC08 MCUs allow a timer pin to be
used as a clock input source.) This allows Tango3 to provide the MCU
with an accurate clock source, which can be used by the MCU to
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Tango3 Driver
AN2707
11