參數(shù)資料
型號： UPD64MC
廠商： NEC Corp.
英文描述： 4-BIT SINGLE-CHIP MICROCONTROLLER FOR INFRARED REMOTE CONTROL TRANSMISSION
中文描述： 4位單片機的紅外遙控傳輸
文件頁數(shù)： 28/68頁
文件大?。?/td> 301K
代理商： UPD64MC
28
μ
PD63, 63A, 64
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.
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 252/f
X
to 700/f
X
(when about 70 to 190
μ
s; f
X
= 3.64 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-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. However, malfunction for such reasons as the clock not
oscillating due to low power supply voltage may occur (refer to
Cautions 3
. in
7. POC CIRCUIT
).
7.2 Oscillation Check at Low Supply Voltage
A reliable resetting 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-detected voltage). Whether this condition is being met or not can be checked by measuring the oscillation
status on a product which actually contains 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
< 0.9 V), the X
OUT
pin is 0 V regardless of the V
DD
. However, at the point that V
DD
reaches
the POC-detected voltage (voltage somewhere between V
POC
= 0.9 to 2.2 V), the voltage of the X
OUT
pin jumps to
about 0.5 V
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-detected 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
2.2 V
V
POC
0.9 V
0 V
Internal reset signal
Reset
Operating ambient temperature T
A
= – 20 to + 70°C
Clock frequency f
X
= 2.4 to 4 MHz
←
POC-detected voltage V
POC
= 0.9 to 2.2 V
Note 3
→
t
OPERATING mode
↑
Reset
Note 2
↑
Note 1
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