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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 outputs 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 x 15 SEG to 15 DGT x 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 (VDD): + 4.5 to 5.5 V High-voltage (Vpp): VDD - 35 V
VPP NCE OE NSDO NSDI NSCK VSS VDD 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
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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
9 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 VDD VSS VPP
s Pin Descriptions
Pin No. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 Symbol VPP NCE OE NSDO NSDI NSCK VSS VDD 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
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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 x 10-segment display (Using a single MN12511) 6 grid-bit 10 segment-bit
Example: For use with a 15-grid x 11-segment display (Using two MN12511 chips) * 15 grid-bit ***** 11 segment-bit
Note) *: Bits marked with an asterisk are unused.
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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 VPP level from all the high-voltage output ports.
s Electrical Characteristics
1. Absolute Maximum Ratings at VSS = 0 V, Ta = 25 C2 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 VDD VPP 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 Topr Tstg Rating - 0.3 to +7.0 VDD- 45 to VDD+0.3 VSS- 0.3 to VDD+0.3 VSS- 0.3 to VDD+0.3 VSS- 0.3 to VDD+0.3 - 40 to VDD+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 s
T No more than 50 s
5. Insert a capacitor of at least 0.1 F between VDD and VSS as close as possible to the LSI pins.
2. Operating Conditions at VSS = 0 V, Ta = -10 C to 70 C Parameter Supply Voltage Symbol VDD VPP Potential difference between VDD and VPP. Conditions Min 4.5 Typ 5.0 Max 5.5 35 Unit V
3. DC Characteristics at VSS = 0 V, Ta = -10 C to 70 C Parameter 1) Supply current Operating supply current IDD 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 0.7VDD VSS VDD 0.2VDD 10 V V A
5
MN12511
s Electrical Characteristics (continued)
Microcontroller Peripheral LSIs
3. DC Characteristics at VSS = 0 V, Ta = -10 C to 70 C (continued) Parameter Symbol Conditions Min Typ Max Unit
4) High-voltage output pins D15 to 0 (P-channel open drain, built-in pull-down resistors) Output current IOH2 VDD = 5 V, VPP = -30 V, VOH2 = 3.1 V VDD = 5 V, VPP = -30 V, VOH2 = 2.0 V Output leakage current Pull-down resistor ILOL2 RINT2 VDD = 5 V, VPP = -30 V, VOH2 = -30 V, P ch.-Tr. OFF VDD = 5 V, VPP = -30 V, VOH2 = 5 V VDD = 5 V, VPP = -30 V, VOH2 = -15 V -8 -1.5 30 30 10 250 250 A k mA
4. AC Characteristics at VSS = 0 V, Ta = -10 C to 70 C Parameter Serial clock frequency (NSCK) NCE interval (OE NCE) NSCK interval (NCE NSCK) Serial input setup time (NSDI) Serial input hold time (NSDI) Serial output delay time (NSDO) Symbol fNSCK TOE TNCE TNSDIS TNSDIH TNSDOD Figure 1 Figure 1 Figure 1 Figure 2 Figure 2 Figure 2 Conditions Min 100 100 100 100 Typ Max 1 100 Unit MHz ns ns ns ns ns
6
Microcontroller Peripheral LSIs
s Electrical Characteristics (continued)
4. AC Characteristics at VSS = 0 V, Ta = -10 C to 70 C (continued)
MN12511
OE 50 %
NCE 50 % 50 %
NSCK
50 %
50 %
50 %
TOE TNCE
fNSCK
TNCE
Figure 1 OE, NCE, and NSCK Timing
NSCK 50 % 50 %
TNSDIS TNSDIH NSDI 90 % 10 % TNSDOD NSDO 90 % 10 %
Figure 2 NSCK, NSDI, and NSDO Timing
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MN12511
s Sample Application Systems
* When one driver LSI is used
Microcontroller OE NSBT NSBO Output port
Microcontroller Peripheral LSIs
Driver OE NSCK NSDI NCE NSDO D15 - 0
* When two driver LSIs are used
Microcontroller OE NSBT NSBO Output port OE
Driver D15 - 0
NSCK NSDI NCE NSDO
Driver OE NSCK NSDI NCE NSDO D15 - 0
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Microcontroller Peripheral LSIs
s Package Dimensions (Unit : mm)
* SOP024-P-0375
MN12511
15.300.20 24 13 1.100.20
7.200.20
9.400.30
0.15 -0.05
+0.10
0 to10 0.30min.
2.000.20 0.100.10
1
12
(0.67)
1.27
0.400.10 Seating plane
2.40max.
Seating plane
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