AS3909 データシートの表示（PDF） - austriamicrosystems AG
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AS3909 Datasheet PDF : 77 Pages
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Application Information
This command is accepted in any mode where the oscillator and
regulators are running. This command is not accepted in case
the external definition of the regulated voltage is selected in
the Regulated Voltage Definition Register (#16, bit reg_s is set to
H)
Calibrate Modulation Depth
Starts a patent pending sequence, which activates the
transmission, measures the modulation depth and adapts it to
comply with the modulation depth specified in the Modulation
Depth Definition Register (#10). When calibration procedure is
finished result is displayed in Modulation Depth Display Register.
Please see “AM Modulation Depth Definition Using Direct
Command Calibrate Modulation Depth” on page 60 for details
about setting the AM modulation depth and running this
command.
Duration time: 10ms max
This command is accepted in any mode where the oscillator and
regulators are running.
Calibrate Antenna2
Sending this command starts a patent pending sequence
which adjusts the parallel capacitances connected to TRIMx
pins so that the antenna LC is in resonance. See “Calibrate
Antenna Resonance” on page 64 for details.
Duration time: 400μs max
This command is accepted in any mode where the oscillator and
regulators are running.
Check Antenna Resonance
This command measures the antenna LC tank resonance to
determine whether a calibration is needed. See “Check Antenna
Resonance” on page 63 for details.
Duration time: 42μs max.
This command is accepted in any mode where the oscillator and
regulators are running.
Clear RSSI
The Receiver automatically clears the RSSI bits in the Receiver
State Display Register and starts to measure the RSSI when the
signal rx_on is asserted. Since the RSSI bits store peak value
(peak-hold type) eventual variation of the receiver input signal
will not be followed (this may happen in case of long message
or test procedure). The direct command Clear RSSI clears the
RSSI bits in the Receiver State Display Register, the RSSI
measurement is restarted (in case of course rx_on is still high).
2. Only available in AS3910.
ams Datasheet, Confidential: 2013-Oct [3-02]
AS3909/AS3910 – 33
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