AS3909 datasheet(36/77 Pages) AMSCO

36 / 77 page

AS3909/AS3910 – 36

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

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

Configuration Registers

Figure 24:

Configuration Register 2

Note: Default setting is set at power up and after Set Default command.

Address # 02: Configuration Register 2

Type: RW

Bit

Name

Def.

Function

Comments

7sing

→ only RFO1 driver will be used

Choose between single and

differential driving of antenna.

6envi

→ input applied to RFI1 is envelope

RF envelope input

tf2

→ reduces the gain for 11 dB in first

stage after peak detector

When both bits are set there is 17 dB

gain reduction in first stage

tf1

→ reduces the gain for 6 dB in first

stage after peak detector

3osc

→ 13.56MHz Xtal,

→ 27.12MHz Xtal

Selector for crystal oscillator

2out_cl1

out_cl1

out_cl0

out_cl

Selection of clock frequency on

MCU_CLK output. In case of “11”,

MCU_CLK output is permanently low.

out_cl0

3.39MHz

6.78 MHZ

13.56 MHZ

no output

0Not used

AS3909 数据表(PDF) 36 Page - ams AG

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