Microcontroller Peripheral LSIs
MN12511
Fluorescent Display Tube Driver LSI
s
Overview
The MN12511 is a fluorescent display tube driver LSI. It
accepts data for display transferred over a serial interface,
generates the digit and/or segment drive signals, and out-
puts those signals from 16 high-voltage ports.
This LSI allows the number of digits displayed to be
increased easily by the cascade connection of additional
MN12511 LSIs. Also, the MN12511 does not preassign
the outputs to digits or segments, so it can be used with a
wide range of display types.
s
Features
•
Sixteen high-voltage handling output ports
Number of digit outputs (DGT): 1 to 15 outputs can be
arbitrarily assigned
Number of segment outputs (SEG): 1 to 15 outputs can
be arbitrarily assigned
•
FLP display
• The display mode can be set to any combination of
from 1 DGT
×
15 SEG to 15 DGT
×
1 SEG
• The display on/off state can be controlled from the
OE pin.
•
Four-wire serial interface (Includes a chip select signal)
• Built-in shift register
• The MN12511 can be connected in cascade.
•
Supply voltage
Digital block (V
DD
):
+
4.5 to 5.5 V
High-voltage (V
pp
): V
DD
−
35 V
V
PP
NCE
OE
NSDO
NSDI
NSCK
V
SS
V
DD
D15
D14
D13
D12
1
2
3
4
5
6
7
8
9
10
11
12
(TOP VIEW)
24
23
22
21
20
19
18
17
16
15
14
13
D0
D1
D2
D3
D4
D5
D6
D7
D8
D9
D10
D11
s
Applications
•
Video, audio, and other equipment that uses fluorescent
display tubes
1
MN12511
s
Block Diagram
Microcontroller Peripheral LSIs
OE
3
R
16-bit output data register
CK
4
8
7
1
R
NSDI
NSCK
NCE
5
6
2
Delay circuit
D15
10
D14
11
D13
12
D12
13
D11
14
D10
15
D9
16
D8
17
D7
18
D6
19
D5
20
D4
21
D3
22
D2
23
D1
24
D0
High-voltage handling output ports
16-bit shift register
CK
NSDO
V
DD
V
SS
V
PP
s
Pin Descriptions
Pin No.
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
Symbol
V
PP
NCE
OE
NSDO
NSDI
NSCK
V
SS
V
DD
D15
D14
D13
D12
D11
D10
D9
D8
D7
D6
I/O
I
I
I
O
I
I
I
I
O
O
O
O
O
O
O
O
O
O
Description
Pull-down power supply
Chip select input
Display on/off state control input
Serial data output
Serial data input
Serial data clock input
Ground (display)
Power supply
High-voltage output 15
High-voltage output 14
High-voltage output 13
High-voltage output 12
High-voltage output 11
High-voltage output 10
High-voltage output 9
High-voltage output 8
High-voltage output 7
High-voltage output 6
2
9
Microcontroller Peripheral LSIs
s
Pin Descriptions (continued)
Pin No.
19
20
21
22
23
24
Symbol
D5
D4
D3
D2
D1
D0
I/O
O
O
O
O
O
O
Description
High-voltage output 5
High-voltage output 4
High-voltage output 3
High-voltage output 2
High-voltage output 1
High-voltage output 0
MN12511
s
Operational Description
•
Transfer timing
The figure below shows the input timing for the NCE, NSCK, and NSDI pins during data transfers.
NCE
NSCK
NSDI
D15
D14
D1
D0
NSDI is acquired on the rising edge of NSCK.
NSDO is output on the falling edge of NSCK.
•
Transfer Format
The following transfer formats could be considered as the data format for data transfer from the system
microcontroller.
Note that other transfer formats are possible, depending on the requirements of the particular application.
Example: For use with a 6-grid
×
10-segment display (Using a single MN12511)
6 grid-bit
10 segment-bit
Example: For use with a 15-grid
×
11-segment display (Using two MN12511 chips)
*
15 grid-bit
* * * * *
11 segment-bit
Note) *: Bits marked with an asterisk are unused.
3
MN12511
s
Operational Description (continued)
•
Display Timing
NCE
Microcontroller Peripheral LSIs
NSCK
NSDI
Serial data transferred to
the 16-bit shift register
OE
Display start
D0 to Dn
Note) 1. The OE pin should be set low each time the display is changed.
2. If the fluorescent display control input (OE) is set low during a serial data transfer, the MN12511 will detect an
incorrect transfer and output the V
PP
level from all the high-voltage output ports.
s
Electrical Characteristics
1. Absolute Maximum Ratings at V
SS
= 0 V, T
a
= 25
°C±2 °C
Parameter
Supply voltage (digital power supply)
Supply voltage (High-voltage output power supply)
Input voltage
Output voltage
I/O voltage
High-voltage output pin voltage
Normal pin peak output current
Symbol
V
DD
V
PP
VI1
VO1
VIO1
VIO2
IOH(peak)
IOL(peak)
Normal pin average output current
IOH(ave)
IOL(ave)
High-voltage output pin output current
Allowable power dissipation
Operating temperature
Storage temperature
IOH
PT
T
opr
T
stg
Rating
−
0.3 to
+7.0
V
DD
−
45 to V
DD
+0.3
V
SS
−
0.3 to V
DD
+0.3
V
SS
−
0.3 to V
DD
+0.3
V
SS
−
0.3 to V
DD
+0.3
−
40 to V
DD
+0.3
−10
30
−5
15
−30
300
−10
to
+70
−55
to
+125
mA
mW
°C
°C
mA
Unit
V
V
V
V
V
V
mA
Note) 1. These values are limiting values under which the device will not be destroyed. Operation is not guaranteed within these
ranges.
2. These values are limiting values such that the device will not be destroyed if voltages within these ranges are applied to the
pins. Operation is not guaranteed within these ranges.
3. Applies to any 100 ms period.
4
Microcontroller Peripheral LSIs
s
Electrical Characteristics (continued)
MN12511
Note) (continued)
4. The rating for capacitance coupled spike noise that exceeds the absolute maximum rating of
−40
V and that occurs at most
once in any of the display cycles is defined as shown below.
Period T
V
−30
V
−40
V
−50
V
No more than 50
µs
T
No more than 50
µs
5. Insert a capacitor of at least 0.1
µF
between V
DD
and V
SS
as close as possible to the LSI pins.
2. Operating Conditions at V
SS
= 0 V, T
a
=
−10 °C
to 70
°C
Parameter
Supply Voltage
Symbol
V
DD
V
PP
Potential difference between V
DD
and V
PP
.
Conditions
Min
4.5
Typ
5.0
Max
5.5
35
Unit
V
3. DC Characteristics at V
SS
= 0 V, T
a
=
−10 °C
to 70
°C
Parameter
1) Supply current
Operating supply current
I
DD
3
10
mA
Symbol
Conditions
Min
Typ
Max
Unit
2) Input pins NCE, OE, NSCK, and NSDI (Schmitt inputs)
High-level input voltage
Low-level input voltage
Input leakage current
3) The NSDO output pin
High-level output voltage
Low-level output voltage
VOH1
VOL1
IOH1
= −
0.5 mA
IOL2
=
0.5 mA
4.5
0.5
V
V
VIH1
VIL1
ILK1
VIN
=
0 to 5 V
0.7V
DD
V
SS
V
DD
0.2V
DD
±10
V
V
µA
5
