AS3911 datasheet(58/149 Pages) AMSCO

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AS3911 – 58

ams Datasheet, Confidential: 2013-Oct [2-03]

A p pl i c at io n I n f o r m at i o n

The phase measurement result can be calculating using the

following formulas:

Duration time: 25 μs max.

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 not possible.

IRQ due to termination of direct command is produced after

command execution is terminated.

Clear RSSI

The Receiver automatically clears the RSSI bits in the Receiver

State Display Register and starts to measure the RSSI of the

received signal 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

rx_on is still high).

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.

Transparent Mode

Enter in the Transparent mode. The Transparent mode is

entered on the rising edge of signal /SS and is maintained as

long as signal /SS is kept high. See “Transparent Mode” on

page 58 for more details.

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

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

Calibrate Capacitive Sensor

This command calibrates the Capacitive Sensor. See “Capacitive

Sensor” on page 14 for more details.

Duration time: 3 ms max.

This command is executed in case capacitive sensor automatic

calibration mode is set (all bits cs_mcal in the Capacitive Sensor

Control Registerare set to 0). In order to avoid interference with

Xtal oscillator and reader magnetic field it strongly

recommended to use this command in Power-down mode only.

Direct command chaining is not possible.

IRQ due to termination of direct command is produced after

command execution is terminated.

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