135
Pull-down
M
i
t
s
u
M
S
b
i
s
3
M
h
0
I
C
i
m
2
R
i
1
O
c
r
8
C
o
c
o
G
M
m
p
r
P
u
t
u
T
e
r
p
R
s
o
U
S
I
N
G
L
E
-
C
H
I
P
1
6
-
B
I
T
C
M
O
O
E
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0
7
0
7
0
P4
3
’s built-in pull-down resistors are the same as that of high-breakdown voltage ports P0
0
to P0
7
.
Note 2:
The absolute maximum ratings of power dissipation may be exceed owing to the number of built-in
pull-down resistor. After calculating the power dissipation, specify the option type.
Note 3:
The option types B to G cannot be specified because these types are currently under development.
MASK OPTION OF PULL-DOWN RESISTOR (object product: mask ROM version)
Whether built-in pull-down resistors are connected or not to high-breakdown voltage ports P2
0
to P2
7
, P3
0
to P3
7
,and P4
0
to P4
3
can be specified in ordering mask ROM. The option type can be specified from
among 7 types; A to G.
A
P2
0
P2
1
P2
2
P2
3
P2
4
P2
5
P2
6
P2
7
P3
0
P3
1
P3
2
P3
3
P3
4
P3
5
P3
6
P3
7
P4
0
P4
1
P4
2
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
P4
3
0
Power Dissipation Calculating Method
(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 = 68 k
(min.)
Power dissipation of internal circuit (CPU, ROM, RAM etc.) = 5 V X 38 mA = 190 mW
(
Fixed number depending on use condition)
Apply voltage to V
EE
pin: Vcc – 50 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 X 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 X b X (1–Toff / Tdisp) X voltage} / a
(2) Segment pin power dissipation
{i X d X (1–Toff / Tdisp) X voltage} / a
(3) Pull-down resistor power dissipation (digit)
{power dissipation per 1 digit X (b X f / b) X (1–Toff / Tdisp) } / a
(4) Pull-down resistor power dissipation (segment)
{power dissipation per 1 segment X (d X g / c) X (1–Toff / Tdisp) } / a
(5) Internal circuit power dissipation (CPU, ROM, RAM etc.) = 190 mW
(1) + (2)+ (3) + (4) + (5) = X mW