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參數(shù)資料
| 型號： | ATA5728P6-TKQY |
| 廠商： | ATMEL CORP |
| 元件分類： | 通信及網(wǎng)絡(luò) |
| 英文描述： | SPECIALTY TELECOM CIRCUIT, PDSO20 |
| 封裝： | SSOP-20 |
| 文件頁數(shù)： | 3/46頁 |
| 文件大?。?/td> | 776K |
| 代理商： | ATA5728P6-TKQY |
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11
9106E–RKE–07/08
ATA5723/ATA5724/ATA5728
The clock cycle of some function blocks depends on the selected baud-rate range (BR_Range),
which is defined in the OPMODE register. This clock cycle T
XClk is defined by the following
formulas:
BR_Range =
BR_Range0:
T
XClk = 8 × TClk
BR_Range1:
T
XClk = 4 × TClk
BR_Range2:
T
XClk = 2 × TClk
BR_Range3:
T
XClk = 1 × TClk
8.
Polling Mode
According to Figure 8-1 on page 12, the receiver stays in polling mode in a continuous cycle of
three different modes. In sleep mode the signal processing circuitry is disabled for the time
period T
Sleep while consuming low current of IS =ISoff. During the start-up period, TStartup, all sig-
nal processing circuits are enabled and settled. In the following bit-check mode, the incoming
data stream is analyzed bit-by-bit and compared with a valid transmitter signal. If no valid signal
is present, the receiver is set back to sleep mode after the period T
Bit-check. This period varies
according to each check as it is a statistical process. An average value for T
Bitcheck is given in the
electrical characteristics. During T
Startup and TBit-check, the current consumption is IS =ISon. The
condition of the receiver is indicated on pin IC_ACTIVE. The average current consumption in
polling mode is dependent on the duty cycle of the active mode and can be calculated as:
During T
Sleep and TStartup, the receiver is not sensitive to a transmitter signal. To guarantee the
reception of a transmitted command, the transmitter must start the telegram with an adequate
preburst. The required length of the preburst depends on the polling parameters T
Sleep, TStartup,
T
Bit-check and the start-up time of a connected microcontroller, TStart_microcontroller. Thus, TBit-check
depends on the actual bit rate and the number of bits (N
Bit-check) to be tested.
The following formula indicates how to calculate the preburst length.
T
Preburst ≥ TSleep + TStartup + TBit-check + TStart_microcontroller
8.1
Sleep Mode
The length of period T
Sleep is defined by the 5-bit word Sleep of the OPMODE register, the exten-
sion factor X
calculated to be:
T
Sleep =Sleep × XSleep × 1024 × TClk
The maximum value of T
Sleep is about 60 ms if XSleep is set to 1. The time resolution is about
2 ms in that case. The sleep time can be extended to almost half a second by setting X
Sleep to 8.
X
Sleep can be set to 8 by bit XSleepStd to “1”.
Setting the configuration word Sleep to its maximal value puts the receiver into a permanent
sleep mode. The receiver remains in this state until another value for Sleep is programmed into
the OPMODE register. This is particularily useful when several devices share a single data line.
(It can also be used for microcontroller polling: using pin POLLING/_ON, the receiver can be
switched on and off.)
I
Spoll
I
Soff
T
Sleep
I
Son
T
Startup
T
Bit-check
+
()
×
+
×
T
Sleep
T
Startup
T
Bit-check
++
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| ATA5743 | 制造商:ATMEL 制造商全稱:ATMEL Corporation 功能描述:UHF ASK/FSK Receiver |
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| ATA5743P3-TGQY 19 | 功能描述:射頻接收器 ASK/FSK Rec(impr.FSK SensitivIF=300kH) RoHS:否 制造商:Skyworks Solutions, Inc. 類型:GPS Receiver 封裝 / 箱體:QFN-24 工作頻率:4.092 MHz 工作電源電壓:3.3 V 封裝:Reel |
| ATA5743P3-TGSY | 功能描述:射頻接收器 ASK/FSK Rec.(imp.FSK sensitiv IF=300kH) RoHS:否 制造商:Skyworks Solutions, Inc. 類型:GPS Receiver 封裝 / 箱體:QFN-24 工作頻率:4.092 MHz 工作電源電壓:3.3 V 封裝:Reel |
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