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| 型号： | MICRF219AAYQS |
| 厂商： | Micrel Inc |
| 文件页数： | 12/23页 |
| 文件大小： | 0K |
| 描述： | IC RECEIVER QWIKRADIO 16QSOP |
| 标准包装： | 98 |
| 频率： | 300MHz ~ 450MHz |
| 灵敏度： | -112.5dBm |
| 调制或协议： | ASK，OOK |
| 应用： | 通用 |
| 电流 - 接收： | 4.3mA |
| 数据接口： | PCB，表面贴装 |
| 天线连接器： | PCB，表面贴装 |
| 特点： | 配有 RSSI |
| 电源电压： | 3 V ~ 3.6 V |
| 工作温度： | -40°C ~ 105°C |
| 封装/外壳： | 16-SSOP（0.154"，3.90mm 宽） |
| 供应商设备封装： | 16-QSOP |
| 包装： | 管件 |
| 其它名称： | 576-3899-5 |
Micrel, Inc.
Reference Oscillator
The reference oscillator in the MICRF219A (Figure 5)
uses a basic Pierce crystal oscillator configuration with
MOS transconductor. Though the MICRF219A has built-
in load capacitors for the crystal oscillator, the external
load capacitors are still required for tuning it to the right
frequency. RO1 and RO2 are external pins of the
MICRF219A to connect the crystal to the reference
oscillator.
Figure 5. Reference Oscillator Circuit
Reference oscillator crystal frequency can be calculated
using Equation 3. For example, if f RF = 433.92MHz, f REF
= 13.52313MHz. Table 4 lists the values of reference
frequencies at different popular RF frequencies. To
operate the MICRF219A with minimum offset, use
proper loading capacitance recommended by the crystal
manufacturer.
MICRF219A
called “bit checking” in this datasheet. A “valid bit” is a
mark or space with duration that is longer than the bit
check window. A “bad bit” is a mark or space with
duration that is shorter than the bit check window. The
user can set different bit check window time to suit a
particular signal by programming register bits D[11:9] as
listed in the register programming section. The number
of consecutive valid bits before releasing DO and exiting
polling mode can also be set by register bits D[8:7].
Figure 6. One Bad Bit Followed by Two Valid Bits
During the bit checking operation, DO is held low while
the bit checker examines the pulse widths at the node
labeled DO’ in Figure 1. If there is no signal present and
DO’ randomly chatters, the MICRF219A returns to sleep
after seeing 4 consecutive bad bits.
Note that since DO’ randomly chatters with no signal
RF Input Frequency (MHz)
315.0
390.0
418.0
433.92
Reference Frequency (MHz)
9.81713*
12.15446
13.02708
13.52313*
present, the amount of time it takes for 4 consecutive
bad bits to happen is random. Therefore, the duration of
polling time is random without signal.
If enough consecutive valid bits are found, DO is
released and the MICRF219A stays on in the continuous
receive mode. Once the chip is in continuous receive
mode, it will not go back to sleep automatically when RF
*Empirically derived, slightly different from Equation 3.
Table 4. Reference Frequency Examples
Auto-Polling
The MICRF219A can be programmed into an auto-
polling mode by setting register bit D[15] to 1, where it
monitors if there is a valid incoming RF signal while
holding DO low. In this mode, the chip goes between
sleep state and polling state. In sleep state, only a low
power sleep clock is on, resulting in very low current
consumption of 13 μ A typical. The sleep time is
programmable from 10ms to 1.28s. In a polling state,
every block in the MICRF219A is on, and the chip looks
for signal with bit durations greater than a user-
programmed value. This operation is subsequently
signal is removed. The register bits must be
programmed again to put the MICRF219A back into
auto-polling mode.
Squelch Operation
Squelch operation can be used to limit the amount of
activity on the DO pin during normal operation, which is
particularly useful when interrupts generated on DO can
interfere with correct operation. Using squelch is not
recommended for systems that can program the chip
into auto-polling mode, since it suppresses more activity
on DO, and reduces the average current consumption.
When squelch is enabled (SQ pin tied low while register
bit D17 is 0), DO pin goes high once about every 100ms
instead of chattering all the time when squelch is
disabled.
July 2011
12
M9999-071811-A
RadioTech@micrel.com or (408) 944-0800
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MICRF219AAYQS TR | 功能描述:射频接收器 300MHz to 450MHz, 3.0V to 3.6V, 6mA, <10kbps, ASK Receiver with Auto-Poll, RSSI and Squelch (Recommended for New Designs) 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 |
| MICRF219AAYQS-TR | 功能描述:- RF Receiver ASK, OOK 300MHz ~ 450MHz -112.5dBm PCB, Surface Mount 16-QSOP 制造商:microchip technology 系列:- 包装:剪切带（CT） 零件状态:停产 频率:300MHz ~ 450MHz 灵敏度:-112.5dBm 数据速率（最大值）:- 调制或协议:ASK，OOK 应用:通用 电流 - 接收:4.3mA 数据接口:PCB，表面贴装 存储容量:- 天线连接器:PCB，表面贴装 特性:配有 RSSI 电压 - 电源:3 V ~ 3.6 V 工作温度:-40°C ~ 105°C 封装/外壳:16-SSOP（0.154"，3.90mm 宽） 供应商器件封装:16-QSOP 标准包装:1 |
| MICRF219AYQS | 功能描述:射频接收器 QwikRadio Receiver (Not Recommended for New Designs) 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 |
| MICRF219AYQS TR | 功能描述:射频接收器 QwikRadio Receiver (Not Recommended for New Designs) 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 |
| MICRF220 | 制造商:MICREL 制造商全称:Micrel Semiconductor 功能描述:300MHz to 450MHz, 3.3V ASK/OOK Receiver with RSSI and Squelch |
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