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參數(shù)資料
| 型號： | UPD6604GS |
| 廠商： | NEC Corp. |
| 英文描述： | 4-BIT SINGLE-CHIP MICROCONTROLLER FOR INFRARED REMOTE CONTROL TRANSMISSION |
| 中文描述： | 4位單片機(jī)的紅外遙控傳輸 |
| 文件頁數(shù)： | 28/64頁 |
| 文件大?。?/td> | 268K |
| 代理商： | UPD6604GS |
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28
μ
PD6604
Data Sheet U11281EJ3V0DS00
7.1 Functions of POC Circuit
The POC circuit has the following functions:
Generates an internal reset signal when V
DD
≤
V
POC
.
Cancels an internal reset signal when V
DD
> V
POC
.
Here, V
DD
: power supply voltage, V
POC
: POC-detected voltage.
V
DD
0.9 V
0 V
Internal reset signal
Reset
Operating ambient temperature T
A
= _ 20 to + 70°C
Clock frequency f
OSC
= 300 to 500 kHz
←
POC-detected voltage V
POC
= 0.9 to 2.2 V
Note 3
→
t
OPERATING mode
↑
Reset
Note 2
↑
Note 1
3.6 V
2.2 V
V
POS
Notes 1.
In reality, there is the oscillation stabilization wait time until the circuit is switched to OPERATING
mode. The oscillation stabilization wait time is about 60/f
OSC
to about 116/f
OSC
(about 130 to 250
μ
s;
when f
OSC
= 455 kHz).
2.
For the POC circuit to generate an internal reset signal when the power supply voltage has fallen,
it is necessary for the power supply voltage to be kept less than the V
POC
for the period of 1 ms or
more. Therefore, in reality, there is the time lag of up to 1 ms until the reset takes effect.
3.
The POC-detected voltage (V
POC
) varies between 0.9 to 2.2 V; thus, the resetting may be canceled
at a power supply voltage smaller than the assured range (V
DD
= 1.8 to 3.6 V). However, as long as
the conditions for operating the POC circuit are met, the actual lowest operating power supply voltage
becomes lower than the POC-detected voltage. Therefore, there is no malfunction occurring due to
the shortage of power supply voltage.
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