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參數(shù)資料
| 型號(hào)： | MICRF302YML TR |
| 廠商： | Micrel Inc |
| 文件頁數(shù)： | 14/15頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC ENCODER PAR QWIKRADIO 10-MLF |
| 標(biāo)準(zhǔn)包裝： | 1 |
| 類型： | 編碼器 |
| 應(yīng)用： | RF，IR |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 10-VFDFN 裸露焊盤，10-MLF? |
| 供應(yīng)商設(shè)備封裝： | 10-MLF?（3x3） |
| 包裝： | 標(biāo)準(zhǔn)包裝 |
| 產(chǎn)品目錄頁面： | 571 (CN2011-ZH PDF) |
| 其它名稱： | 576-3337-6 |
Micrel, Inc.
MICRF302
March 2010
8
M9999-032610-A
MICRF302 Parallel Encoder Features
Transmit Timeout
The MICRF302 implements a 25-second (nominal)
transmit timeout timer. If a user pushes an MICRF302
button and holds it down, transmission of packets (in
repeated groups of four) will continue for no more than
25 seconds. Afterwards, the MICRF302 shuts down and
waits to be restarted by another button push. The button
must be released before it can be pushed again to
restart packet transmission.
The purpose of the transmit timeout is to prevent battery
drain and unnecessary transmission where a user might,
for example, sit on a remote control.
Preamble/Dead-Time/Sync Format
The MICRF302 sends a lengthy amount of information at
the start of the packet to help the decoder synchronize to
the incoming data stream. The format is as followed:
1. 32 zeros
2. Three-bit dead time of no Manchester-coded
data. This allows the MICRF302 to be used with
receivers whose AGC benefits from the
presence of a dead time.
3. Four ones (1111) mark the end of the preamble,
dead time, and sync. The bit following the last
one of the four is the first data bit of the 20-bit
DEVADR field.
Inter-Packet Delay
The delay (dead time, no Manchester-coded data)
between subsequent packets is always eight bit-times.
Important: Encoder Bit-Time Variation
The frequency of the MICRF302’s on-chip oscillator
varies by ±10% over supply voltage, temperature, and
manufacturing tolerances. It is important to remember
that this means that the MICRF302 Encoder’s bit time
does not vary by ±10%; it varies as follows. Consider an
MICRF302 Encoder set to transmit at a nominal rate of
1 kHz, with a nominal bit-time of 1 ms. The transmit
frequency will then fall in the range of 900 Hz to 1.1 kHz.
The corresponding bit-times are 1.111 ms to 0.909 ms.
This actually corresponds to a variation in bit-time of –
9.1% to +11.1%. It is critical that the decoder
accommodate incoming data streams whose bit-times
fall within this range, not ±10%.
TX Enable
The MICRF302 TXEN is normally low and goes active-
high ~ 40 ms before data is seen at the output (Figure 7,
8) and remains high until D0-D3 is deactivated or the
internal MICRF302 time out has elapsed (Figure 9).
TX Enable, SEL0=SEL1=VSS
Figure 7. TX Enable Output and Data Output
Figure 8. TX Enable Output and Data Output Zoom In
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