參數(shù)資料
型號: M38B79MFH-XXXXFP
元件分類: 微控制器/微處理器
英文描述: 8-BIT, MROM, 4.2 MHz, MICROCONTROLLER, PQFP100
封裝: 14 X 20 MM, 0.65 MM PITCH, PLASTIC, QFP-100
文件頁數(shù): 88/112頁
文件大小: 1862K
代理商: M38B79MFH-XXXXFP
38B7 Group
SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER
MITSUBISHI MICROCOMPUTERS
74
Power Dissipation Calculating Method
(Fixed number depending on microcomputer’s standard)
VOH output fall voltage of high-breakdown port
2 V (max.); | Current value | = at 18 mA
Resistor value = 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 VEE pin: Vcc – 45 V
Timing number a; digit number b; segment number c
Ratio of Toff time corresponding Tdisp time: 1/16
Turn ON segment number during repeat cycle: d
All segment number during repeat cycle: e (= a c)
Total number of built-in resistor: for digit, f; for segment, g
Digit pin current value h (mA)
Segment pin current value i (mA)
(1) Digit pin power dissipation
{h b (1 – Toff / Tdisp) voltage} / a
(2) Segment pin power dissipation
{i d (1–Toff / Tdisp) voltage} / a
(3) Pull-down resistor power dissipation (digit)
{power dissipation per 1 digit (b f / b) (1–Toff / Tdisp) } / a
(4) Pull-down resistor power dissipation (segment)
{power dissipation per 1 segment (d g / c) (1–Toff /
Tdisp) } / a
(5) Internal circuit power dissipation (CPU, ROM, RAM etc.)
= 190 mW
(1) + (2)+ (3) + (4) + (5) = X mW
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