參數(shù)資料
型號(hào)： AS3901
廠(chǎng)商： AUSTRIAMICROSYSTEMS AG
元件分類(lèi)： 通信及網(wǎng)絡(luò)
英文描述： ISM 433/315 MHz FSK/ASK Transmitter
中文描述： SPECIALTY TELECOM CIRCUIT, PDSO14
封裝： TSSOP-14
文件頁(yè)數(shù)： 7/18頁(yè)
文件大?。?/td> 618K
代理商： AS3901
ISM 433/315 MHz FSK/ASK Transmitter – Data Sheet
AS3901
Rev. 6, August 2000
Page 7 of 18
1.7.1 Interface Description
Wake-up sequence:
TX/ASK=H, STDBY=H: Standby. All off low current state.
TX/ASK
→
L, STDBY=H;
→
XTAL oscillator starts up. NRES goes L, resetting (starting)
the μC for
tXTON
plus 3 clock cycles.
NRES returns to H, μC initializes.
After μC is initialized, it sets STDBY
→
L; PLL is turned on, after t
PLLon
a stable RF carrier
is generated.
TX/ASK
→
H, STDBY=L;
→
TX is turned on, t
TXON
later the RF signal is available and data
can be transmitted.
To switch the AS3901 on“ a push button“ with series resistance ~10-20 k
can be
used to make TX/ASK = L“. The push-button“ must be pushed long enough (typ. >
3ms) for the μC to reset and sustain the TX/ASK L“ state.
Standby procedure
(for sleep-mode ( IDD1 <1μA):
The μC outputs a H“ to TX/ASK and STDBY. After minimal 3 CLK cycles the XTAL
oscillator will be switched off. The pull-up resistors at the AS3901 TX/ASK and STDBY
inputs will sustain the sleep mode.
Note:
Multiple push buttons“ for different functions can be used.
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