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參數(shù)資料
| 型號： | LC7185-8750 |
| 元件分類： | PLL合成/DDS/VCOs |
| 英文描述： | PLL FREQUENCY SYNTHESIZER, 30 MHz, PDIP30 |
| 封裝： | SDIP-30 |
| 文件頁數(shù)： | 12/12頁 |
| 文件大?。?/td> | 152K |
| 代理商： | LC7185-8750 |
(8) Key Matrix
It is normal to put diodes in series with the key scanning lines to avoid creating a short with the output lines.
But KO1, KO2 and KO3 lines (key scan signal output) do not need diodes.
Explanation Regarding Power On and Hold Mode
(1) Operation in hold mode
When in hold mode (HOLD = 0), the LC7185-8750 does not accept any operation other than the INIT pin being asserted
(reset). The primary function of hold mode is to maintain the contents of station memory.
.
In hold mode, the programmable divider, crystal oscillator and reference divider are all stopped.
The PD pin (charge pump output) goes to high impedance. The UL pin goes to VSS.
.
The channel display pins D1 and D2 go to high impedance.
.
The BEEP pin goes to VSS.
.
The key scan signal outputs (KO1 to KO3) go to VSS.
When the LC7185-8750 leaves hold mode, the previously selected channel is reopened.
(2) Initial state settings
The LC7185-8750 can be reset to its initial state settings (reset) after the battery has been replaced, etc., by setting INIT = 0.
The initial state that is established by an initial reset is as follows:
.
When the VDD pin turned on, CH9 or CH33 is selected.
.
When the VDD pin operate voltage already, CH9 is selected.
.
All of station memory is set to CH33.
Pins KO1,
KO2, KO3
On impedance
pins
Pull-down resistor
Item
Linear circuit
LC7185-8750
No. 3356-9/12
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