Microcontroller Peripheral LSIs MN12511 Fluorescent Display Tube Driver LSI ■ 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. ■ 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 (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 24 23 22 21 20 19 18 17 16 15 14 13 D0 D1 D2 D3 D4 D5 D6 D7 D8 D9 D10 D11 (TOP VIEW) ■ Applications • Video, audio, and other equipment that uses fluorescent display tubes 1 MN12511 Microcontroller Peripheral LSIs 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 ■ Block Diagram High-voltage handling output ports OE 3 R 16-bit output data register R NSDI NSCK NCE CK Delay circuit 5 16-bit shift register CK 6 8 7 2 1 ■ Pin Descriptions 2 4 Pin No. Symbol I/O Description 1 VPP I Pull-down power supply 2 NCE I Chip select input 3 OE I Display on/off state control input 4 NSDO O Serial data output 5 NSDI I Serial data input 6 NSCK I Serial data clock input 7 VSS I Ground (display) 8 VDD I Power supply 9 D15 O High-voltage output 15 10 D14 O High-voltage output 14 11 D13 O High-voltage output 13 12 D12 O High-voltage output 12 13 D11 O High-voltage output 11 14 D10 O High-voltage output 10 15 D9 O High-voltage output 9 16 D8 O High-voltage output 8 17 D7 O High-voltage output 7 18 D6 O High-voltage output 6 NSDO VDD VSS VPP Microcontroller Peripheral LSIs MN12511 ■ Pin Descriptions (continued) Pin No. Symbol I/O Description 19 D5 O High-voltage output 5 20 D4 O High-voltage output 4 21 D3 O High-voltage output 3 22 D2 O High-voltage output 2 23 D1 O High-voltage output 1 24 D0 O High-voltage output 0 ■ Operational Description • Transfer timing The figure below shows the input timing for the NCE, NSCK, and NSDI pins during data transfers. NCE NSCK NSDI D14 D15 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 Microcontroller Peripheral LSIs ■ Operational Description (continued) • Display Timing NCE 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. ■ Electrical Characteristics 1. Absolute Maximum Ratings at VSS = 0 V, Ta = 25 °C±2 °C Parameter Symbol Rating Unit Supply voltage (digital power supply) VDD − 0.3 to +7.0 V Supply voltage (High-voltage output power supply) VPP VDD− 45 to VDD+0.3 V Input voltage VI1 VSS− 0.3 to VDD+0.3 V Output voltage VO1 VSS− 0.3 to VDD+0.3 V I/O voltage VIO1 VSS− 0.3 to VDD+0.3 V High-voltage output pin voltage VIO2 − 40 to VDD+0.3 V Normal pin peak output current IOH(peak) −10 mA IOL(peak) 30 IOH(ave) −5 IOL(ave) 15 High-voltage output pin output current IOH −30 mA Allowable power dissipation PT 300 mW Operating temperature Topr −10 to +70 °C Storage temperature Tstg −55 to +125 °C Normal pin average output current 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 MN12511 ■ Electrical Characteristics (continued) 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 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 Conditions VDD VPP Potential difference between VDD and VPP. Min Typ Max Unit 4.5 5.0 5.5 V 35 Min Typ Max Unit 3 10 mA 3. DC Characteristics at VSS = 0 V, Ta = −10 °C to 70 °C Parameter Symbol Conditions 1) Supply current Operating supply current IDD 2) Input pins NCE, OE, NSCK, and NSDI (Schmitt inputs) High-level input voltage VIH1 0.7VDD VDD V Low-level input voltage VIL1 VSS 0.2VDD V Input leakage current ILK1 VIN = 0 to 5 V ±10 µA High-level output voltage VOH1 IOH1 = − 0.5 mA 4.5 V Low-level output voltage VOL1 IOL2 = 0.5 mA 0.5 V 3) The NSDO output pin 5 MN12511 Microcontroller Peripheral LSIs ■ Electrical Characteristics (continued) 3. DC Characteristics at VSS = 0 V, Ta = −10 °C to 70 °C (continued) Parameter Symbol Conditions Min Typ Max Unit mA 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 −8 VDD = 5 V, VPP = −30 V, VOH2 = 2.0 V −1.5 Output leakage current ILOL2 VDD = 5 V, VPP = −30 V, VOH2 = −30 V, P ch.−Tr. OFF ±10 µA Pull-down resistor RINT2 VDD = 5 V, VPP = −30 V, VOH2 = 5 V 30 250 kΩ VDD = 5 V, VPP = −30 V, VOH2 = −15 V 30 250 Min Typ Max Unit 4. AC Characteristics at VSS = 0 V, Ta = −10 °C to 70 °C Parameter Symbol Conditions fNSCK Figure 1 1 MHz NCE interval (OE → NCE) TOE Figure 1 100 ns NSCK interval (NCE → NSCK) TNCE Figure 1 100 ns Serial input setup time (NSDI) TNSDIS Figure 2 100 ns Serial input hold time (NSDI) TNSDIH Figure 2 100 ns Serial output delay time (NSDO) TNSDOD Figure 2 100 ns Serial clock frequency (NSCK) 6 Microcontroller Peripheral LSIs MN12511 ■ Electrical Characteristics (continued) 4. AC Characteristics at VSS = 0 V, Ta = −10 °C to 70 °C (continued) OE 50 % NCE 50 % NSCK 50 % 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 7 MN12511 Microcontroller Peripheral LSIs ■ Sample Application Systems • When one driver LSI is used Microcontroller OE Driver OE D15 - 0 NSBT NSCK NSBO NSDI Output port NCE NSDO • When two driver LSIs are used Microcontroller OE Driver OE D15 - 0 NSBT NSCK NSBO NSDI Output port NCE NSDO Driver OE NSCK NSDI NCE NSDO 8 D15 - 0 Microcontroller Peripheral LSIs MN12511 ■ Package Dimensions (Unit : mm) • SOP024-P-0375 15.30±0.20 13 (0.67) 1.27 0.40±0.10 Seating plane +0.10 9.40±0.30 2.40max. 0.15 –0.05 7.20±0.20 12 2.00±0.20 1 1.10±0.20 0.10±0.10 24 0 to10° 0.30min. Seating plane 9