參數(shù)資料
型號: M38B79MFH-A055FP
廠商: Mitsubishi Electric Corporation
英文描述: SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER
中文描述: 單芯片8位CMOS微機
文件頁數(shù): 76/109頁
文件大?。?/td> 1559K
代理商: M38B79MFH-A055FP
38B7 Group
SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER
MITSUBISHI MICROCOMPUTERS
PRELIMINARY
Notice: This is not a final specification.
change.
Some parametric limits are subject to
76
Power Dissipation Calculating Example 2
(2 or more digits turned ON at the same time)
(Fixed number depending on microcomputer
s standard)
V
OH
output fall voltage of high-breakdown port
2 V (max.); | Current value | = at 18 mA
Resistor value 43 V / 900
μ
s = 48 k
(min.)
Power dissipation of internal circuit (CPU, ROM, RAM etc.)
= 5 V
15 mA = 75 mW
(
Fixed number depending on use condition)
Apply voltage to V
EE
pin: Vcc
45 V
Timing number 11; digit number 12; segment number 24
Ratio of Toff time corresponding Tdisp time: 1/16
Turn ON segment number during repeat cycle: 114
All segment number during repeat cycle: 264 (= 11
24)
Total number of built-in resistor: for digit, 10; for segment, 22
Digit pin current value 18 (mA)
Segment pin current value 3 (mA)
(1) Digit pin power dissipation
{18
12
(1
1 / 16)
2} / 11 = 36.82 mW
(2) Segment pin power dissipation
{3
114
(1
1 / 16)
2} / 11 = 58.30 mW
(3) Pull-down resistor power dissipation (digit)
[{45
2}
2
/ 48
(12
10 / 12)
(1
1 / 16)] / 11 = 32.84 mW
(4) Pull-down resistor power dissipation (segment)
[{45
2}
2
/ 48
(114
22 / 24)
(1
1 / 16)] / 11 = 343.08 mW
(5) Internal circuit power dissipation (CPU, ROM, RAM etc.)
= 75 mW
(1) + (2)+ (3) + (4) + (5) = 547 mW
DIG0
DIG1
DIG2
DIG3
DIG7
DIG8
DIG9
Timing
number
1
2
3
4
5
6
7
8
9
10
11
DIG4
DIG5
DIG6
Tscan
Repeat cycle
Fig. 84 Digit timing waveform (2)
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