Mitsubishi M35501FP Datasheet
MITSUBISHI IC’S
M35501FP
FLD (VFD) DIGIT EXPANDER
DESCRIPTION
The M35501FP generates digit signals for fluorescent display
when connected to the output port of a microcomputer. There are
up to 16 digit pins available, and more can be added by connecting additional M35501FPs. The number of fluorescent displays
can be increased easily by connecting the M35501FP to the
CMOS FLD (VFD; Vacuum Fluorescent Display) output pins of an
8-bit microcomputer in MITSUBISHI’s 38B5 Group. The
M35501FP is suitable for fluorescent display control on household
electric appliances, audio products, etc.
PIN CONFIGURATION (TOP VIEW)
0
EE
DIG
V
→
←
2
1
DIG
←
←
DIG
3
DIG
←
FEATURES
●Digit output.............................................................16 (maximum)
•Up to 16 pins can be selected
•More digits available by connecting additional M35501FPs
•Output structure: high-breakdown voltage, P-channel opendrain; built-in pull-down resistor between digit output pins and
VEE pin
●Power-on reset circuit........................................................ Built-in
●Power source voltage ................................................ 4.0 to 5.5 V
●Pull-down power source voltage ................................ Vcc – 43 V
●Operating temperature range...................................–20 to 85 °C
●Package ............................................................................. 24P2E
●Power dissipation ...............250µW (at 100 kHz operation clock)
6
←
4
DIG
←
5
DIG
←
DIG
←
7
DIG
8
9
10
DIG
DIG
←
15161718192021222324
DIG
←
←
14
13
Fig. 1 Pin configuration of M35501FP
M35501FP
123456789101112
→
13
DIG
12
DIG
→
11
DIG
→
SS
V
←
CLK
CC
V
←
RESET
←
SEL
←
IN
OVF
→
OUT
OVF
15
DIG
Outline: 24P2E-A
24-pin plastic-molded SSOP
→
→
14
DIG
FUNCTIONAL BLOCK
OVFOUT
7
6
OVFIN
3
CC
V
VSS
1
4
RESET
DIG15 DIG14 DIG13 DIG12 DIG11 DIG10 DIG9 DIG8 DIG7 DIG6 DIG5 DIG4 DIG3 DIG2 DIG1 DIG0
16
8
10
9
11
14
13
12
15
17
20
1918
21
Shift register
Optional digit
Power-on
reset
counter
MITSUBISHI IC’S
M35501FP
FLD (VFD) DIGIT EXPANDER
2322
VEE
24
Fig. 2 Functional block diagram
PIN DESCRIPTION
Table 1 Pin description
Pin
VCC, VSS
RESET
CLK
SEL
OVFIN
OVFOUT
DIG15–
DIG0
VEE
Power source input
Reset input
Clock input
Select input
Overflow signal input
Overflow signal output
Digit output
Pull-down power source input
Name
5
2
CLK SEL
Function
Apply 4.0–5.5 V to Vcc, and 0V to Vss.
Reset internal shift register (built-in power-on reset
circuit).
Digit output varies according to rising edge of clock
input.
Use when specifying the number of digits.
Input “H” when using one M35501FP. Connect to
OVFOUT pin of additional M35501FPs when using
multiple M35501FPs (to use 17 digits or more).
Leave open when using one M35501FP. Connect to
OVFIN pin of additional M35501FPs when using multiple
M35501FPs (to use 17 digits or more).
Output the digit output waveform of fluorescent
display. Leave open when not in use (VEE level
output).
Apply voltage to DIG0–DIG15 pull-down resistors.
Output Structure
–
CMOS input level
Built-in pull-up resistor
CMOS input level
Built-in pull-down resistor
CMOS input level
Built-in pull-down resistor
CMOS input level
CMOS output
High-breakdown-voltage
P-channel open-drain output
Built-in pull-down resistor
–
Fig. No.
–
3
2
2
4
5
1
–
2
PORT BLOCK
MITSUBISHI IC’S
M35501FP
FLD (VFD) DIGIT EXPANDER
(1) DIG0–DIG15
Shift register
(3) RESET
(2) SEL, CLK
Pull-down transistor
V
EE
(4) OVF
Pull-up transistor
IN
Fig. 3 Port block diagram
(5) OVFOUT
Shift register
3
USAGE
Three usages of the M35501FP are described below.
(1) 16-Digit Mode: 16 digits selected
The number of digits is set to 16 by fixing the OVFIN pin to “H” and
the SEL pin to “L.” Figure 5 shows the output waveform.
(2) Optional Digit Mode: 1-16 digits selectable
When the number of CLK pin rising edges during an “H” period of
the SEL pin is n and the OVFIN pin is fixed to “H,” the number of
digits set is n. If n is 16 or more, all 16 digits are set. Figure 6
shows the output waveform.
SEL pin
MITSUBISHI IC’S
M35501FP
FLD (VFD) DIGIT EXPANDER
n
CLK pin
Fig. 4 Digit setting
(3) Cascade Mode: 17 digits or more selectable
17 digits or more can be used by connecting two M35501FPs or
more. Figure 7 shows an example using three M35501FPs, offering
33 to 48 digit outputs.
Cascade mode will not operate if all M35501FPs are in 16-digit
mode (SEL = “L”). Use the most significant M35501FP in the optional
digit mode for DIG output. Figure 8 shows the output waveform.
4
DIGIT OUTPUT WAVEFORM
MITSUBISHI IC’S
M35501FP
FLD (VFD) DIGIT EXPANDER
SEL
“L”
CLK
DIG
0
DIG1
DIG2
DIG13
DIG14
DIG15
OVFOUT
Fig. 5 16-digit mode output waveform
RESET
SEL
CLK
DIG
0
DIG
1
DIG
2
DIG
3
4
15
OUT
“L”
“L”
DIG
DIG
OVF
Fig. 6 Optional digit mode output waveform
5
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