參數(shù)資料
型號(hào)： UPD75208
廠商： NEC Corp.
英文描述： 4-BIT SINGLE-CHIP MICROCOMPUTER
中文描述： 4位單片機(jī)
文件頁(yè)數(shù)： 39/62頁(yè)
文件大?。?/td> 497K
代理商： UPD75208
39
μ
PD75208
(30 + 5.5 V)
2
40 k
×
10 = 315 mW
×
2 V
×
10 mA
×
4 = 53 mW
10
15
*
1.
Calculation of total loss
Design so that the sum of the following three power consumption values for the
μ
PD75208CW/GF will be less
than the total loss P
T
(It is recommended to use the system with 80 % or less of the rating).
CPU loss
: Given as V
DD
(MAX.)
×
I
DD1
(MAX.)
Output pin loss
: There are normal output pin loss and display output pin loss. It is necessary
to add a loss derived from the flow of maximum current to each output pin.
Pull-down register loss : Power loss due to a pull-down resistor incorporated in the display output pin
by mask option.
Example
Suppose 4-LED output with 9
SEG
×
11
DIGIT
, V
DD
= 5 V + 10 % and 4.19 MHz oscillation and let a maximum
of 3 mA, 15 mA and 10 mA flow to the segment pin, timing pin and LED output pin, respectively.
Further, let the voltage of fluorescent display tube (V
LOAD
voltage) be –30 V and normal voltage be small.
CPU loss : 5.5 V
×
9.0 mA = 49.5 mW
Pin loss
: Segment pin ..... 2 V
×
3 mA
×
9 = 54 mW
Timing pin......... 2 V
×
15 mA = 30 mW
LED output ........
Pull-down resistor loss ........
P
T
=
+
+
= 501.5 mW
In this example, the power consumption of 501.5 mW is less than the allowable total loss for the shrink
DIP package (600 mW). However, since the allowable total loss is 450 mW for the QFP package, it is
necessary to decrease power consumption by decreasing the number of on-chip pull-down resistors. In
this example, power consumption can be adjusted to 344 mW by incorporating pull-down resistors in
only 11 digit outputs and 4 segment outputs and externally mounting pull-down resistors to the 5
remaining segment outputs.
2.
Except the system clock oscillator, display controller and timer/pulse generator.
3.
The operating voltage range varies depending on the cycle time. Refer to the section describing AC
characteristics.
相關(guān)PDF資料
PDF描述
UPD75208CW 4-BIT SINGLE-CHIP MICROCOMPUTER
UPD753208GT 4-BIT SINGLE-CHIP MICROCONTROLLERS
UPD753204 4-BIT SINGLE-CHIP MICROCONTROLLERS
UPD753204GT 4-BIT SINGLE-CHIP MICROCONTROLLERS
UPD753208 4-BIT SINGLE-CHIP MICROCONTROLLERS
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