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| 型号： | AS3931-ZTSU |
| 厂商： | ams |
| 文件页数： | 25/31页 |
| 文件大小： | 0K |
| 描述： | IC ASK RECEIVER LF 3CH 16-TSSOP |
| 标准包装： | 96 |
| RF 型： | 接收器 |
| 频率： | 19kHz ~ 150kHz |
| 封装/外壳： | 16-TSSOP（0.173"，4.40mm 宽） |
| 供应商设备封装： | 16-TSSOP |
| 包装： | 管件 |
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AS3931
Datasheet - E x t e n d e d O p e r a t i o n
10 Extended Operation
10.1 Power Management
10.1.1 Sleep Mode
In sleep mode, all channels are switched off, taking no current except for the bias cells of the amplifiers. Sleep mode is entered by register
setting, bits P0, P1, P2 set to 0. The remaining elements that take current are the oscillator and the regulator (if used). The Serial Programming
Interface remains active also in the sleep mode.
10.1.2 Standby Mode
In standby mode, selected channels are switched on, ready to receive data. The amplifier of the selected channel is on, whereas the correlator is
powered down as long as no input signal is detected at the input. Enabling the related channel when setting bits P0, P1 or P3 enters the standby
mode. In the standby mode, the current consumption increases by the amplifier currents compared to the sleep mode.
10.1.3 Receive Mode
An enabled channel automatically changes from the standby mode to the receive mode as soon as an input signal is detected. The channel
stays in receive mode as long as an input signal is detected. In receive mode, the correlator of the channel is active, scanning the input signal
waveform for a valid wake up pattern. The channel goes back to standby mode if no input signal is detected for more then a fixed timeout period.
The timeout period is approximately 3.3 ms. by this operating principle it is guaranteed, that the correlators are only active and taking current as
long as it is really necessary.
10.1.4 Regulator On/Off
The regulator can be switched off to reduce the current consumption. When switching off, the supply voltage is bypassed unregulated to the
internal circuits, so VREG = VCC. Otherwise, the internal voltage is regulated to 2.4 V. Switching off the regulator saves about 1 μA of current.
The regulator should only be switched off, when VCC is not higher then 3.3 V, otherwise the current consumption is increased because the
internal circuits will then take more current.
10.1.5 Typical Current Consumption in Different Modes
The Table 28 gives an overview of the typical current consumptions in the different modes. All three channels are used in this case. Power
consumption of course can be further reduced when not all three channels are enabled.
Table 28. Typical Current Consumption
Operating Mode
Sleep
Standby
Receive
Standby & RSSI low step
Regulator on, VCC = 3 V
0.8 μA
7.0 μA
7.2 μA
6.6 μA
Regulator off, VCC = 2.4 V
0.3 μA
6.5 μA
6.8 μA
6.1 μA
10.1.6 RSSI Step
The RSSI step is defined as the change in the RSSI signal voltage if the input amplitude steps from zero to a defined (small) value. For example
when changing the input signal amplitude from zero to 1 mVpp, the RSSI signal makes a step of app. 175 mV if the bit T4 is set to 1 (compare to
Figure 8 on page 21). If not needed, this step can be reduced to a lower value (T4 = 0), which decreases the current consumption of each
channel by app. 120 nA.
10.1.7 Antenna Rotation
The 3 possible input signals can be distributed to the 3 channels in 3 different connection modes. Using this feature, the differences between the
individual antenna voltages and also the differences of the individual RSSI-voltages of the channels can be handled. For example to eliminate
the differences of the RSSI-voltages it is possible to use only one channel and to multiplex it to each antenna. The Bits P4 and P5 select the
Antenna Rotation Modes.
10.2 Input Attenuation and Input Shortcutting
All differential LF-inputs are each shorted by approximately 500 Ω when setting Bits P4 and P5 both to 1. This can be used to measure the
RSSI-voltage with no input signal present; therefore the RSSI offset can be calibrated. It should be taken into account that the shortcut
resistance can not be made zero due to design restrictions, so the input signal cancellation is not 100% (depending on the antenna circuit).
www.austriamicrosystems.com/AS3931
Revision 6.2
24 - 30
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相关代理商/技术参数 |
参数描述 |
|---|---|
| AS3932 | 制造商:AMSCO 制造商全称:austriamicrosystems AG 功能描述:3D Low Frequency Wakeup Receiver |
| AS3932 DB | 功能描述:BOARD DEMO AS3932 RX/TX RoHS:否 类别:RF/IF 和 RFID >> RF 评估和开发套件，板 系列:- 标准包装:1 系列:- 类型:GPS 接收器 频率:1575MHz 适用于相关产品:- 已供物品:模块 其它名称:SER3796 |
| AS3932 DEMOBOARD | 功能描述:BOARD DEMO AS3932 RX/TX 制造商:ams 系列:- 零件状态:有效 类型:接收器 频率:125kHz 配套使用产品/相关产品:AS3932 所含物品:板 标准包装:1 |
| AS3932 DK | 功能描述:BOARD SYSTEM AS3932 RX/TX RoHS:否 类别:RF/IF 和 RFID >> RF 评估和开发套件，板 系列:- 标准包装:1 系列:- 类型:GPS 接收器 频率:1575MHz 适用于相关产品:- 已供物品:模块 其它名称:SER3796 |
| AS3932-BQFT | 功能描述:射频接收器 RoHS:否 制造商:Skyworks Solutions, Inc. 类型:GPS Receiver 封装 / 箱体:QFN-24 工作频率:4.092 MHz 工作电源电压:3.3 V 封装:Reel |
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