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參數(shù)資料
| 型號： | SI4020-I1-FT |
| 廠商： | Silicon Laboratories Inc |
| 文件頁數(shù)： | 16/32頁 |
| 文件大小： | 1058K |
| 描述： | IC TX FSK 915MHZ 5.4V 16-TSSOP |
| 標準包裝： | 96 |
| 頻率： | 315MHz，433MHz，868MHz，和 915MHz |
| 調制或協(xié)議： | FSK，OOK |
| 數(shù)據(jù)傳輸率 - 最大： | 256 kbps |
| 電流 - 傳輸： | 14mA |
| 數(shù)據(jù)接口： | PCB，表面貼裝 |
| 天線連接器： | PCB，表面貼裝 |
| 電源電壓： | 2.2 V ~ 5.4 V |
| 工作溫度： | -40°C ~ 85°C |
| 封裝/外殼： | 16-TSSOP（0.173"，4.40mm 寬） |
| 包裝： | 管件 |
| 產(chǎn)品目錄頁面： | 585 (CN2011-ZH PDF) |
| 其它名稱： | 336-1621-5 |
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Si4020
16
6. Low Battery Detector Command
bit 15 14 13 12 11 10
9
8
7
6
5
4
3
2
1
0
POR
1
1
0
0
0
0
1
0
0
0
0
t4
t3
t2
t1
t0
C200h
The 5-bit value T of <t4 : t0> determines the threshold voltage V
lb
of the detector:
V
lb
= 2.25 V + T * 0.1 V
7. Sleep Command
bit 15 14 13 12 11 10
9
8
7
6
5
4
3
2
1
0
POR
1
1
0
0
0
1
0
0
s7 s6 s5 s4 s3 s2 s1 s0
C400h
The effect of this command depends on the Power Management Command. It immediately disables the power amplifier (if a0=1 and
ea=0) and the synthesizer (if a1=1 and es=0). Stops the crystal oscillator after S periods of the microcontroller clock (if a1=1 and
ex=0) to enable the microcontroller to execute all necessary commands before entering sleep mode itself. The 8-bit value S is
determined by bits <s7 : s0>.
8. Push-Button Command
bit 15 14 13 12 11 10
9
8
7
6
5
4
3
2
1
0
POR
1
1
0
0
1
0
1
0
p4 d1 d0 b4 b3 b2 b1 bc
CA00h
If the corresponding bit was set (b1-b4) the event remains active while the button is pressed. In EEPROM mode, the chip is continuously
performing the routine assigned to the push-button while it is pressed. In microcontroller mode, the chip continuously generates interrupts
on nIRQ until the push-button is released. Weak pull-up currents are switched off when bc is high.
The d0, d1 bits set the de-bouncing time period:
d1 d0 De-bouncing Time [ms]
0
0
160
0
1
40
1
0
10
1
1
0 (Bypassed)
Note:
" Until the de-bouncing time has expired, the crystal oscillator remains switched on, independent of the status of the ex bit in the
Power Management Command. (Because the circuit uses the crystal oscillator signal for timing.)
If the p4 bit is set, the controller performs the routine assigned to the fourth button when PB1 and PB2 are pressed down
simultaneously. With the addition of this feature, there is a way to build a device that uses 3 buttons, but performs 4 functions.
It is possible to detect multiple pressed push-buttons in both modes. In EEPROM mode the controller executes sequentially all the
routines belonging to the pressed buttons.
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