M38B53M4-059FP datasheet(84/355 Pages) MITSUBISHI

84 / 355 page

38B5 Group User’s Manual

1-68

HARDWARE

Power Dissipation Calculating example 2

(when 2 or more digit is turned ON at same

time)

q 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 43 V / 900

µA = 48 kΩ (min.)

• Power dissipation of internal circuit (CPU, ROM, RAM etc.) = 5 V !

15 mA = 75 mW

q Fixed number depending on use condition

• Apply voltage to VEE 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

Fig. 77 Digit timing waveform (2)

MASK OPTION OF PULL-DOWN RESISTOR

DIG0

DIG1

DIG2

DIG3

DIG7

DIG8

DIG9

Timing number

91011

DIG4

DIG5

DIG6

Tscan

Repeat cycle

M38B53M4-059FP Datasheet(PDF) 84 Page - Mitsubishi Electric Semiconductor

M38B53M4-059FP Datasheet(HTML) 84 Page - Mitsubishi Electric Semiconductor

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 ...More

Datasheet Download

Link URL