AS3911 datasheet(36/159 Pages) AMSCO

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[v2-11] 2016-Jun-13

AS3911 − Application Information

Figure 21:

Recommended Blocking Capacitor Values

Figure 22:

The AS3911 Power Supply System

Regulators have two basic operation modes depending on

supply voltage, 3.3V supply mode (max 3.6V) and 5V supply

mode (max 5.5V ). The supply mode is set by writing bit sup3V

in the IO Configuration Register 2. Default setting is 5V so this

bit has to be set to one after power-up in case of 3.3V supply.

In 3.3V mode all regulators are set to the same regulated voltage

in range from 2.4V to 3.4V, while in 5V only the VSP_RF can be

set in range from 3.9V to 5.1V, while VSP_A and VSP_D are fixed

to 3.4V.

Figure 22 depicts signals controlling the power supply system.

The regulators are operating when signal en is high (en is

configuration bit in Operation Control Register). When signal

en is low the AS3911 is in low power Power-down mode. In this

mode consumption of the power supply system is also

minimized.

Pins

Recommended Capacitors

AGD-VSS

1μF || 10nF

VSP_A-VSN_A

VSP_D-VSN_D

2.2μF || 10nF

VSP_RF-VSN_RF

2.2μF || 10nF

Power-down

Support

sup3V

50 ohm

RV<3:0>

VSP_RF

REG

BGR

AGC

AUTOREG

VSP_A

VSP_RF

VSP_D

AGD

reg2Bh

VDD

reg2Ah

VSP_A

REG

VSP_D

REG

adjust

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