AS3909 datasheet(33/77 Pages) AMSCO

33 / 77 page

ams Datasheet, Confidential: 2013-Oct [3-02]

AS3909/AS3910 – 33

Appl icatio n I n f o rm a t i o n

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

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.

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