參數(shù)資料
型號(hào)： 6P8B
廠商： NEC Corp.
英文描述： MOS INTEGRATED CIRCUIT 4-BIT SINGLE-CHIP MICROCONTROLLER FOR INFRARED REMOTE CONTROL TRANSMISSION
中文描述： 馬鞍山集成電路4位單片機(jī)的紅外遙控傳輸
文件頁數(shù)： 39/95頁
文件大?。?/td> 692K
代理商： 6P8B
39
μ
PD6P8, 6P8A, 6P8B
Data Sheet U17848EJ3V0DS
8.1 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 detection voltage.
Notes 1.
Actually, oscillation stabilization wait time must elapse before the circuit is switched to operation mode.
The oscillation stabilization wait time is about 534/f
X
to 918/f
X
(when about 134 to 230
μ
s; @ f
X
= 4 MHz).
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 detection voltage (V
POC
) varies between approximately 1.7 to 1.9 V; thus, the reset may
be canceled at a power supply voltage smaller than the guaranteed range (V
DD
= 1.9 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 detection voltage. Therefore, there is no
malfunction occurring due to a shortage of power supply voltage. However, malfunction for such
reasons as the clock not oscillating due to low power supply voltage may occur (refer to
Cautions
3
in
8 POC CIRCUIT
).
8.2 Oscillation Check at Low Supply Voltage
A reliable reset operation can be expected of the POC circuit if it satisfies the condition that the clock can oscillate
even at low power supply voltage (the oscillation start voltage of the resonator being even lower than the POC
detection voltage). Whether this condition is met or not can be checked by measuring the oscillation status in a
product that actually includes a POC circuit, as follows.
<1>Connect a storage oscilloscope to the X
OUT
pin so that the oscillation status can be measured.
<2>Connect a power supply whose output voltage can be varied and then gradually raise the power supply
voltage V
DD
from 0 V (making sure to avoid V
DD
> 3.6V).
At first (during V
DD
< approx. 1.7 V), the X
OUT
pin is 0 V regardless of the V
DD
. However, at the point that V
DD
reaches the POC detection voltage (V
POC
= 1.8 V (TYP.)), the voltage of the X
OUT
pin jumps to about 0.5V
DD
. Maintain
this power supply voltage for a while to measure the waveform of the X
OUT
pin. If by any chance the oscillation
start voltage of the resonator is lower than the POC detection voltage, the growing oscillation of the X
OUT
pin can
be confirmed within several ms after the V
DD
has reached the V
POC
.
V
DD
3.6 V
1.9 V
V
POC
Approx. 1.7 V
0 V
Internal reset signal
Reset
Operating ambient temperature T
A
= – 40 to + 85
°
C
Clock frequency f
X
= 3.5 to 4.5 MHz
←
POC detection voltage V
POC
= 1.8 V (TYP.)
Note 3
→
t
Operation mode
↑
Reset
Note 2
↑
Note 1
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