參數(shù)資料
型號: M38B79MFH-A055
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): 75/109頁
文件大?。?/td> 1559K
代理商: M38B79MFH-A055
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
75
Fig. 83 Digit timing waveform (1)
Power Dissipation Calculating Example 1
(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 17; digit number 16; segment number 20
Ratio of Toff time corresponding Tdisp time: 1/16
Turn ON segment number during repeat cycle: 31
All segment number during repeat cycle: 340 (= 17
20)
Total number of built-in resistor: for digit, 16; for segment, 20
Digit pin current value 18 (mA)
Segment pin current value 3 (mA)
(1) Digit pin power dissipation
{18
16
(1
1 / 16)
2} / 17 = 31.77 mW
(2) Segment pin power dissipation
{3
31
(1
1 / 16)
2} / 17 = 10.26 mW
(3) Pull-down resistor power dissipation (digit)
[{45
2}
2
/ 48
(16
16 / 16)
(1
1 / 16)] / 17 = 33.94 mW
(4) Pull-down resistor power dissipation (segment)
[{45
2}
2
/ 48
(31
20 / 20)
(1
1 / 16)] / 17 = 65.86 mW
(5) Internal circuit power dissipation (CPU, ROM, RAM etc.)
= 75 mW
(1) + (2)+ (3) + (4) + (5) = 217 mW
DIG0
DIG1
DIG2
DIG3
DIG13
DIG14
DIG15
Timing
number
1
2
3
16
17
15
14
Tscan
Repeat cycle
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