HT16512

HT165121/4to 1/11Duty VFD ControllerBlock DiagramRev.1.401May 3,2005Features·Logic voltage:5V·High-voltage output:V DD -35V max .·Multiple display (11-segment &11-digit to 16-segment&6-digit)·6´4matrix key scanning ·8steps dimmer circuit ·4LED output ports·4-bit general purpose input port·No external resistors necessary for driver output(provides PMOS open-drain and pull-low resistor output)·Serial interface with MCU (CLK,CS,DI,DO)·44-pin QFP packageApplications·Consumer products panel function control·Industrial measuring instrument panel function control·Other similar application panel function controlGeneral DescriptionHT16512is a VFD (Vacuum Fluorescent Display)con-troller/driver that is driven on a 1/4to 1/11duty factor.It consists of 11segment output lines,6grid output lines,5segment/grid output drive lines,4LED output ports,a control circuit,a display memory,and a key scan circuit.Serial data inputs to the HT16512through a three-line serial interface.This VFD controller/driver is ideal as a peripheral device for an MCU.Pin AssignmentPin DescriptionPin No.Pin Name I/O Description1~4SW0~SW3I 4-bit general purpose input portWhether these pins are used or not,they should be connected to VDD or VSS.5DO O Output serial data at the falling edge of the shift clock,starting from low order bit.This is an NMOS open-drain output pin.6DI I Input serial data at the rising edge of the shift clock,starting from the low order bit.7,43VSS¾Negative power supply,groundBoth of the VSS(pin7and pin43)should be connected to ground.8CLK I Reads serial data at the rising edge,and outputs data at the falling edge.9CS I Initializes serial interface at the rising or falling edge of the HT16512. Then it waits to receive a command.Data input after CS has fallen is processed as a command.While command data is processed,current processing is stopped,and the serial interface is initialized.While CS is high,CLK is ignored.10~13K0~K3I Keying data input to these pins is latched at the end of the display cy-cle.14,38VDD¾Posistive power supply15~20S0/K0~S5/K5O Segment or key source output pins(dual function).This is PMOS open-drain and pull-low resistor output.21~25S6~S10O Segment driver output pins(segment only).This is PMOS open-drain and pull-low resistor output.26,28~31S11/G10~S15/G6O Segment or Grid driver output pins.These pins are selectable for seg-ment or grid driving.This is PMOS open-drain and pull-low resistor output.27VEE¾VFD power supply37~32G0~G5O Grid driver output pins(Grid only).This is PMOS open-drain and pull-low resistor output.42~39LED0~LED3O LED driver output ports.This is a CMOS output pin.44OSC I Connected to an external resistor or an RC oscillator circuit.Rev.1.402May3,2005Approximate Internal ConnectionsAbsolute Maximum RatingsSupply Voltage...........................V SS-0.3V to V SS+5.5V Operating Temperature...........................-25°C to75°C Input Voltage..............................V SS-0.3V to V DD+0.3V Storage Temperature............................-50°C to125°CNote:These are stress ratings only.Stresses exceeding the range specified under²Absolute Maximum Ratings²may cause substantial damage to the device.Functional operation of this device at other conditions beyond those listed in the specification is not implied and prolonged exposure to extreme conditions may affect device reliabil-ity.D.C.Characteristics Ta=25°CSymbol ParameterTest ConditionsMin.Typ.Max.Unit V DD ConditionsV DD Logic Supply Voltage¾¾ 4.55 5.5V V EE VFD Supply Voltage¾¾0¾V DD-35V f OSC Oscillation Frequency5V R OSC=51k W350500650kHz R PL Output Pull-low Resistor5V Driver output50100150k W I DD Operating Current5V No load,VFD display off¾¾5mAI OL Driver Leakage Current5V V O=V DD -35V,VFD driveroff¾¾-10m A I OL1LED Sink Current5V V OL=1V,LED0~LED320¾¾mAI OH1LED Source Current5V V OH=0.9V DDLED0~LED3-1¾¾mAI OH21Segment/Key Source Current5V V OH=V DD -2VS0/K0~S5/K5,S6~S10-3¾¾mAI OH22Segment/Grid Source Current5V V OH=V DD -2VG0~G5,S11/G10~S15/G6-15¾¾mA I OL3DO Sink Current5V V OL=0.4V4¾¾mA V IH²H²Input Voltage¾¾0.7V DD¾V DD VV IL²L²Input Voltage¾¾0¾0.3V DD VV OH1High-level Output Voltage5V LED0~LED3,I OH1=-1mA0.9V DD¾V DD VV OL1Low-level Output Voltage5V LED0~LED3,I OL1=20mA0¾1VV OL2Low-level Output Voltage5V DO,I OL2=4mA0¾0.4V Rev.1.403May3,2005A.C.CharacteristicsTa=25°C Symbol ParameterTest ConditionsMin.Typ.Max.Unit V DD Conditionst PHL Propagation Delay Time5V CLK ®DOC L =15pF,R L =10k W ¾¾100ns t PLH 5V ¾¾300ns t r1Rise Time 5V C L =300pF,S0~S10¾¾2m s t r25V C L =300pF,G0~G5,S11/G10~S15/G6¾¾0.5m s t f Fall Time5V C L =300pF,Sn,Gn ¾¾120m s t max Maximum Clock Frequency 5V Duty=50%1¾¾MHz C i Input Capacitance 5V ¾¾¾15pF t CW Clock Pulse Width 5V ¾400¾¾ns t SW Strobe Pulse Width 5V ¾1¾¾us t SU Data Setup Time 5V ¾100¾¾ns t h Data Hold Time 5V ¾100¾¾ns t CS Clock-Strobe Time 5V CLK rising edge to CS rising edge 1¾¾m s t WWait Time5VCLK rising edge to CLK falling edge1¾¾m sRev.1.404May 3,2005Functional DescriptionDisplay RAM and Display ModeThe static display RAM is organized into 22´8bits and stores the data transmitted from an external device to the HT16512through a serial interface.The contents of the RAM are directly mapped to the contents of the VFD driver.Data in the RAM can be accessed through the data setting,address setting and display control com-mands.It is assigned addresses in 8-bit unit as follows:Dimming ControlHT16512provides 8-step dimmer function on display by controlling the 3-bit binary command code.The full pulse width of grid signal is divides into 16uniform sec-tions by PWM (pulse width modulation)technology.The 16uniform sections available form 8steps dimmer via 3-bit binary code.The 8-step dimmer includes 1/16,2/16,4/16,10/16,11/16,12/16,13/16and 14/16.The 1/16pulse width indicates minimum lightness.The 14/16pulse width represents maximum lightness.(Re-fer to the display control command).Key Matrix and Key-Input Data Storage RAM The key matrix scans the series key states at each level of the key strobe signal (S0/K0~S5/K5)output of the HT16512.The key strobe signal outputs are time-multiplexed signals from S0/K0~S5/K5.The states of inputs K0~K3are sampled by strobe signal S0/K0~S5/K5and latched into the register.The key matrix is made up of a 6´4matrix,as shown be-low.The data of each key is stored as illustrated below,and is read with the read command,starting from the least significant bit.LED PortThe LED port belongs to the CMOS output configura-tion.Data is written to the LED port with the write command, starting from the least port¢s least significant bit.In our application(see application circuits),the user adopts an internal NMOS device to a driver LED component by connecting VDD.When a bit of this port is0,the corre-sponding LED lights;when the bit is1,the LED turns off. The data of bits5through8are ignored.SW DataHT16512provides an extra4-bit general input port.The SW data is provided with available binary code.The SW data is read with the read command,starting from the least significant bit.Bits5through8of the SW data are 0.CommandsCommands set the display mode and status of the VFD driver.The first1byte input to the HT16512through the DI pin after the CS pin has fallen,is regarded as a command.If CS is set high while commands/data are transmitted, serial communication is initialized,and the com-mands/data being transmitted are not valid(however, the commands/data previously transmitted remains valid).·Display mode setting commandsThese commands initialize the HT16512and select the number of segments and the number of grids (1/4~1/11duty,11segments to16segments). When these commands are executed,the display is forcibly turned off,and key scanning is also stopped. To resume display,the display command²ON²must be executed.If the same mode is selected,nothing happens.·Data setting commandsThese commands set the data write and data read modes.·Address setting commandsThese commands set the address of the display mem-ory.If address16H or higher is set,data is ignored until a valid address is set.·Display control commandsRev.1.405May3,2005Timing DiagramsKey Scanning and Display TimingRev.1.406May3,2005Serial Communication Format·Reception(command/data write)·Transmission(data read)·Updating display memory by incrementing address·Updating specific addressesRev.1.407May3,2005Application CircuitsNote:R OSC=51k W for oscillator resistorR1=1~10k W for external pull-high resistorR2~R5=750W~1.2k WR6~R9=10k W for external pull-low resistorD1~D6=1N4001Ef=Filament voltage for VFDBoth of the VSS(pin7and pin43)should be connected to ground.Rev.1.408May3,2005Package Information44-pin QFP(10´10)Outline DimensionsSymbolDimensions in mmMin.Nom.Max.A13¾13.40B9.90¾10.10C13¾13.40D9.90¾10.10E¾0.80¾F¾0.30¾G 1.90¾ 2.20H¾¾ 2.70I¾0.10¾J0.73¾0.93K0.10¾0.20a0°¾7°Rev.1.409May3,2005Holtek Semiconductor Inc.(Headquarters)No.3,Creation Rd.II,Science Park,Hsinchu,TaiwanTel:886-3-563-1999Fax:886-3-563-1189Holtek Semiconductor Inc.(Taipei Sales Office)4F-2,No.3-2,YuanQu St.,Nankang Software Park,Taipei115,TaiwanTel:886-2-2655-7070Fax:886-2-2655-7373Fax:886-2-2655-7383(International sales hotline)Holtek Semiconductor Inc.(Shanghai Sales Office)7th Floor,Building2,No.889,Yi Shan Rd.,Shanghai,China200233Tel:021-6485-5560Fax:021-6485-0313Holtek Semiconductor Inc.(Shenzhen Sales Office)5/F,Unit A,Productivity Building,Cross of Science M3rd Road and Gaoxin M2nd Road,Science Park,Nanshan District, Shenzhen,China518057Tel:0755-8616-9908,8616-9308Fax:0755-8616-9533Holtek Semiconductor Inc.(Beijing Sales Office)Suite1721,Jinyu Tower,A129West Xuan Wu Men Street,Xicheng District,Beijing,China100031Tel:010-6641-0030,6641-7751,6641-7752Fax:010-6641-0125Holtek Semiconductor Inc.(Chengdu Sales Office)709,Building3,Champagne Plaza,No.97Dongda Street,Chengdu,Sichuan,China610016Tel:028-6653-6590Fax:028-6653-6591Holmate Semiconductor,Inc.(North America Sales Office)46729Fremont Blvd.,Fremont,CA94538Tel:510-252-9880Fax:510-252-9885CopyrightÓ2005by HOLTEK SEMICONDUCTOR INC.The information appearing in this Data Sheet is believed to be accurate at the time of publication.However,Holtek as-sumes no responsibility arising from the use of the specifications described.The applications mentioned herein are used solely for the purpose of illustration and Holtek makes no warranty or representation that such applications will be suitable without further modification,nor recommends the use of its products for application that may present a risk to human life due to malfunction or otherwise.Holtek¢s products are not authorized for use as critical components in life support devices or systems.Holtek reserves the right to alter its products without prior notification.For the most up-to-date information, please visit our web site at .Rev.1.4010May3,2005。