- 您现在的位置：买卖IC网 > Datasheet目录395 > AS3932-BTST (ams)IC RF PROGRAM 16-TSSOP Datasheet资料下载
参数资料
| 型号： | AS3932-BTST |
| 厂商： | ams |
| 文件页数： | 20/34页 |
| 文件大小： | 0K |
| 描述： | IC RF PROGRAM 16-TSSOP |
| 标准包装： | 1 |
| RF 型： | 读/写 |
| 频率： | 110kHz ~ 150kHz |
| 特点： | 配有 RSSI |
| 封装/外壳： | 16-TSSOP（0.173"，4.40mm 宽） |
| 供应商设备封装： | 16-TSSOP |
| 包装： | 标准包装 |
| 产品目录页面： | 805 (CN2011-ZH PDF) |
| 其它名称： | AS3932-BTSTDKR |
第1页第2页第3页第4页第5页第6页第7页第8页第9页第10页第11页第12页第13页第14页第15页第16页第17页第18页第19页当前第20页第21页第22页第23页第24页第25页第26页第27页第28页第29页第30页第31页第32页第33页第34页
AS3932
Datasheet - D e t a i l e d D e s c r i p t i o n
8.3 Channel Amplifier and Frequency Detector
Each of the 3 channels consists of a variable gain amplifier, an automatic gain control and a frequency detector. The latter detects the presence
of a carrier. As soon as the carrier is detected the AGC is enabled, the gain of the VGA is reduced and set to the right value and the RSSI can be
displayed.
It is possible to enable/disable individual channels, in case not all three channels are needed. This enables to reduce the current consumption by
1.5 μA (typ.) per channel.
8.3.1
Frequency Detector / AGC
The frequency detection uses the RTC as time base. In case the internal RC oscillator is used as RTC, it must be calibrated, but the calibration
is guaranteed for a 32.768 kHz crystal oscillator only. The frequency detection criteria can be tighter or more relaxed according to the setup
described in R2<1:0> (see Table 14) .
Table 14. Tolerance Settings for Wake-up
R2<1>
0
0
1
1
R2<0>
0
1
0
1
Tolerance
relaxed
tighter (medium)
stringent
reserved
The AGC can operate in two modes:
?? AGC down only ( R1<5> =0)
?? AGC up and down ( R1<5> =1)
As soon as the AGC starts to operate, the gain in the VGA is set to maximum. If the AGC down only mode is selected, the AGC can only
decrease the gain. Since the RSSI is directly derived from the VGA gain, the system holds the RSSI peak.
When the AGC up and down mode is selected, the RSSI can follow the input signal strength variation in both directions.
Regardless which AGC operation mode is used, the AGC needs maximum 35 carrier periods to settle.
The RSSI is available for all 3 channels at the same time and it is stored in 3 registers ( R10<4:0> , R11<4:0> , R12<4:0> )
Both AGC modes (only down or down and up) can also operate with time limitation. This option allows AGC operation only in time slot of 256μs
following the internal wake-up. Then the AGC (RSSI) is frozen till the wake-up or RSSI reset occurs.
The RSSI is reset either with the direct command 'clear_wakeup' or 'reset_RSSI'. The 'reset_RSSI' command resets only the AGC setting but
does not terminate wake-up condition. This means that if the signal is still present the new AGC setting (RSSI) will appear not later than 300μs
(35 LF carrier periods) after the command was received. The AGC setting is reset if for duration of 3 Manchester half symbols no carrier is
detected. If the wake-up IRQ is cleared the chip will go back to listening mode.
In case the maximum amplification at the beginning is a drawback (e.g. in noisy environment) it is possible to set a smaller starting gain on the
amplifier, according to the Table 15 . In this way it is possible to reduce the false frequency detection.
Table 15. Bit Setting of Gain Reduction
R4<3>
0
0
0
0
0
1
1
1
1
R4<2>
0
0
0
1
1
0
0
1
1
R4<1>
0
0
1
0
1
0
1
0
1
R4<0>
0
1
0 or 1
0 or 1
0 or 1
0 or 1
0 or 1
0 or 1
0 or 1
Gain reduction
no gain reduction
n.a.
n.a.
-4dB
-8dB
-12dB
-16dB
-20dB
-24dB
www.ams.com/LF-Receiver/AS3932
Revision 1.7
20 - 34
相关PDF资料 |
PDF描述 |
|---|---|
| AS500106 | TLAPS MAGNET CARRIER |
| AS5263-HQFT-500 | IC ENCODER ROTARY 12BIT 32-QFN |
| AT 150 B420L | SENSOR CURRENT 150A 30V MOD |
| AT 150 B5 | SENSOR CURRENT 150A MOD |
| AT 20 B10 | SENSOR CURRENT 20A MOD |
相关代理商/技术参数 |
参数描述 |
|---|---|
| AS3932-DB | 制造商:ams 功能描述:AS3932 Demo Board Rx & Tx |
| AS3932-DK | 制造商:ams 功能描述:AS3932 Development System |
| AS3933 DB | 制造商:AMS 功能描述:BOARD DEMO FOR AS3933 |
| AS3933 DEV SYSTEM | 功能描述:BOARD DEMO FOR AS3933 制造商:ams 系列:- 零件状态:有效 类型:接收器，ASK 频率:125kHz 配套使用产品/相关产品:AS3933 所含物品:2 板，电源，软件 标准包装:1 |
| AS3933BQFT | 制造商:ams 功能描述:T&R / QFN 16 (4x4) |
发布紧急采购，3分钟左右您将得到回复。