AS3911 datasheet(59/159 Pages) AMSCO

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[v2-11] 2016-Jun-13

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AS3911 − Application Information

Reset Rx Gain

This command initializes the AGC, Squelch and RSSI block.

Sending this command stops a squelch process in case it is

going on, clears the current Squelch setting and loads the

manual gain reduction from Receiver Configuration Register 4.

This command is accepted in case en (bit 7 of the Operation

Control Register) is set and Xtal oscillator frequency is stable.

Direct command chaining is possible.

IRQ due to termination of direct command is not produced.

Adjust Regulators

When this command is sent the power supply level of VDD is

measured in maximum load conditions and the regulated

voltage reference is set 250 mV below this measured level to

assure maximum possible stable regulated supply (Power

Supply System). Using this command increases the system

PSSR.

At the beginning of execution of this command, both the

receiver and transmitter are switched on to have the maximum

current consumption, the regulators are set to the maximum

regulated voltage (5.1 V in case of 5 V supply and 3.4 V in case

of 3.3 V supply mode). After 300 μs VSP_RF is compared to VDD,

in case VSP_RF is not at least 250 mV lower the regulator setting

is reduced for one step (120 mV in case of 5 V supply and 100

mV in case of 3.3 V supply mode) and measurement is done after

next 300 μs. Procedure is repeated until VSP_RF drops at least

250 mV below VDD or until minimum regulated voltage (3.9 V

in case of 5 V supply and 2.4 V in case of 3.3 V supply mode) is

reached.

Duration time: 5 ms max.

This command is accepted in case en (bit 7 of the Operation

Control Register) is set and Xtal oscillator frequency is stable.

This command is not accepted in case the external definition

of the regulated voltage is selected in the Regulator Voltage

Control Register (bit reg_s is set to H)

Direct command chaining is not possible.

IRQ due to termination of direct command is produced after

command execution is terminated.

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