HT16511 1/8 to 1/16 Duty VFD Controller Features · Logic voltage: 5V · 4-bit general purpose input port · High-voltage output: VDD-35V max. · No external resistors necessary for driver output (provides PMOS open-drain and pull-low resistor output) · Multiple display (12-segment & 16-digit to 20-segment & 8-digit) · Serial interface with MCU (CLK, CS, DI, DO) · 12´4 matrix key scanning · 52-pin QFP package · 8 steps dimmer circuit · 5 LED output ports (20mA max.) Applications · Consumer products panel function control · Other similar application panel function control · Industrial measuring instrument panel function control General Description Serial data inputs to the HT16511 through a three-line serial interface. This VFD controller/driver is ideal as a peripheral device for an MCU. HT16511 is a VFD (Vacuum Fluorescent Display) controller/driver that is driven on a 1/8 to 1/16 duty factor. It consists of 12 segment output lines, 8 grid output lines, 8 segment/grid output drive lines, 5 LED output ports, a control circuit, a display memory, and a key scan circuit. Block Diagram C o m m a n d D e c o d e r D I D O C L K S e r ia l I/F D is p la y R A M 2 0 - B it ´ 1 6 W o r d s 2 0 - B it O u tp u t L a tc h 2 0 1 2 C S O S C O S C T im in g G e n e r a to r K e y S c a n D a ta S e le c to r 1 6 - B it S h ift R e g is te r K 0 ~ K 3 4 - B it L a tc h 5 - B it L a tc h M u ltip le x e d D r iv e r 8 G r id D r iv e r 8 S 1 /K 1 ~ S 1 2 /K 1 2 8 S 1 3 /G 1 6 ~ S 2 0 /G 6 8 8 1 6 G 1 ~ G 8 D im m in g C ir c u it L E D 0 ~ L E D 4 Rev. 1.10 1 2 8 K e y D a ta R A M (4 ´ 1 2 ) S W 0 ~ S W 3 S e g m e n t D r iv e r V D D 1 V S S V E E September 18, 2003 HT16511 Pin Assignment L L L L L G G G G G V D E D E D E D E D E D V S O S D C S 5 4 0 1 2 3 4 3 2 1 S W 1 S W 2 S W 3 S W 4 D O D I N C C L K C S K 0 K 1 K 2 K 3 5 2 5 1 5 0 4 9 4 8 4 7 4 6 4 5 4 4 4 3 4 2 4 1 4 0 1 3 9 2 3 8 3 3 7 4 3 6 5 3 5 6 H T 1 6 5 1 1 5 2 Q F P -A 7 8 9 1 0 1 1 1 2 1 3 1 4 1 5 1 6 1 7 1 8 1 9 2 0 2 1 2 2 2 3 2 4 2 5 2 6 3 4 3 3 3 2 3 1 3 0 2 9 2 8 2 7 G 6 G 7 G 8 S 2 S 1 V E V D S 1 S 1 S 1 S 1 S 1 S 1 0 /G 9 /G E D 8 /G 7 /G 6 /G 5 /G 4 /G 3 /G 9 1 0 1 1 1 2 1 3 1 4 1 5 1 6 S 1 2 /K 1 2 S 1 1 /K 1 1 S 1 0 /K 1 0 S 9 /K 9 S 8 /K 8 S 7 /K 7 S 6 /K 6 S 5 /K 5 S 4 /K 4 S 3 /K 3 S 2 /K 2 S 1 /K 1 V D D Pad Assignment O S C 1 4 5 S W 1 4 3 4 2 4 1 2 S W 2 3 S W 3 4 S W 4 D O 4 4 G 4 L E D 4 4 6 G 3 L E D 3 4 7 G 2 L E D 2 4 8 G 1 L E D 1 4 9 V D D L E D 0 V S S 5 0 5 1 5 (0 , 0 ) 6 D I 7 C L K 8 C S 9 K 0 1 0 K 1 1 1 K 2 1 2 K 3 1 3 1 4 1 5 1 6 1 7 1 9 1 8 2 0 2 1 2 3 2 2 2 4 2 5 2 6 4 0 G 5 3 9 G 6 3 8 G 7 3 7 G 8 3 6 S 2 0 /G 9 3 5 S 1 9 /G 1 0 3 4 V E E 3 3 V D D 3 2 S 1 8 /G 1 1 3 1 S 1 7 /G 1 2 3 0 S 1 6 /G 1 3 2 9 S 1 5 /G 1 4 2 8 S 1 4 /G 1 5 2 7 S 1 3 /G 1 6 S 1 2 /K 1 2 S 1 1 /K 1 1 S 1 0 /K 1 0 S 9 /K 9 S 8 /K 8 S 7 /K 7 S 6 /K 6 S 5 /K 5 S 4 /K 4 S 3 /K 3 S 2 /K 2 S 1 /K 1 V D D Chip Size: 103.5 ´ 70.5 (mil)2 * The IC substrate should be connected to VSS in the PCB layout artwork. Rev. 1.10 2 September 18, 2003 HT16511 Pad Coordinates Unit: mm Pad No. X Y Pad No. X Y 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 -1110.000 -1110.000 -1110.000 -1110.000 -1110.000 -1165.900 -1110.000 -1110.000 -1110.000 -1110.000 -1110.000 -1110.000 -1110.000 -897.200 -782.500 -674.500 -566.500 -458.500 -350.500 -242.500 -134.500 -26.500 81.500 189.500 297.500 405.500 555.300 450.300 345.300 240.300 135.300 9.800 -125.500 -230.500 -335.500 -440.500 -545.500 -650.500 -755.500 -560.300 -560.300 -560.300 -560.300 -560.300 -560.300 -560.300 -560.300 -560.300 -560.300 -560.300 -560.300 -560.300 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 977.250 977.250 977.250 977.250 977.250 977.250 977.250 977.250 977.250 977.250 977.250 977.250 977.250 977.250 405.500 297.500 189.500 81.500 -34.700 -173.950 -285.150 -390.150 -501.350 -606.350 -765.200 -720.000 -612.000 -504.000 -396.000 -288.000 -180.000 -55.150 49.850 173.350 281.350 389.350 497.350 605.350 713.350 545.400 545.400 545.400 545.400 545.400 684.850 684.850 684.850 684.850 684.850 726.350 Pin Description Pin No. Pin Name I/O Description 1~4 SW1~SW4 I 4-bit general purpose input port 5 DO 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. 6 DI I Input serial data at the rising edge of the shift clock, starting from the low order bit. 7 NC ¾ 8 CLK I Reads serial data at the rising edge, and outputs data at the falling edge. No connection 9 CS I Initializes serial interface at the rising or falling edge of the HT16511. 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. 10~13 K0~K3 I Keying data input to these pins is latched at the end of the display cycle. 14, 33, 45 VDD ¾ Posistive power supply 15~26 S1/K1~S12/K12 O Segment or key source output pins (dual function). This is PMOS open-drain and pull-low resistor output. 27~32, 35~36 S13/G16~S20/G9 O Segment or Grid driver output pins. These pins are selectable for segment or grid driving. This is PMOS open-drain and pull-low resistor output. 34 VEE ¾ VFD power supply 37~44 G8~G1 O Grid driver output pins (Grid only). This is PMOS open-drain and pull-low resistor output. 46~50 LED4~LED0 O LED driver output ports. This is a CMOS output pin. 51 VSS ¾ Negative power supply, ground 52 OSC I Rev. 1.10 Connected to an external resistor or an RC oscillator circuit. 3 September 18, 2003 HT16511 Approximate Internal Connections N M O S O U T P M O S O U T V D D V E E C M O S O U T V D D Absolute Maximum Ratings Supply Voltage ...........................VSS-0.3V to VSS+6.0V Operating Temperature...........................-25°C to 75°C Input Voltage..............................VSS-0.3V to VDD+0.3V Storage Temperature ............................-50°C to 125°C Note: These are stress ratings only. Stresses exceeding the range specified under ²Absolute Maximum Ratings² may 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 reliability. D.C. Characteristics Symbol Parameter Ta=25°C Test Conditions VDD Conditions Min. Typ. Max. Unit VDD Logic Supply Voltage ¾ ¾ 4.5 5 5.5 V VEE VFD Supply Voltage ¾ ¾ 0 ¾ VDD-35 V fOSC Oscillation Frequency 5V ROSC=51kW 350 500 650 kHz RPL Output Pull-low Resistor 5V Driver output 50 100 150 kW IDD Operating Current 5V No load, VFD display off ¾ ¾ 5 mA IOL Driver Leakage Current 5V VO=VDD-30V, VFD driver off ¾ ¾ -10 mA IOL1 LED Sink Current 5V VOL=1V, LED0~LED4 20 ¾ ¾ mA IOH1 LED Source Current 5V VOH=0.9VDD, LED0~LED4 -1 ¾ ¾ mA IOH21 Segment/Key Source Current 5V VOH=VDD-2V, S1/K1~S12/K12 -3 ¾ ¾ mA IOH22 Segment/Grid Source Current 5V VOH=VDD-2V -15 ¾ ¾ mA IOL3 DO Sink Current 5V VOL=0.4V 4 ¾ ¾ mA VIH ²H² Input Voltage ¾ ¾ 0.7VDD ¾ VDD V VIL ²L² Input Voltage ¾ ¾ 0 ¾ 0.3VDD V VOH1 High-level Output Voltage 5V LED0~LED4, IOH1=-1mA 0.9VDD ¾ VDD V VOL1 Low-level Output Voltage 5V LED0~LED4, IOL1=20mA 0 ¾ 1 V VOL2 Low-level Output Voltage 5V DO, IOL2=4mA 0 ¾ 0.4 V Rev. 1.10 4 September 18, 2003 HT16511 A.C. Characteristics Symbol Ta=25°C Test Conditions tPHL Parameter Min. Typ. Max. Unit ¾ ¾ 300 ns 5V CLK®DO CL=15pF, RL=10kW ¾ ¾ 100 ns 5V CL=300pF, S0~S12 ¾ ¾ 2 ms 5V CL=300pF, G1~G16 ¾ ¾ 0.5 ms Conditions VDD 5V Propagation Delay Time tPLH tr1 Rise Time tr2 tf Fall Time 5V CL=300pF, Sn, Gn ¾ ¾ 120 ms tmax Maximum Clock Frequency 5V Duty=50% 1 ¾ ¾ MHz Ci Input Capacitance 5V ¾ ¾ ¾ 15 pF tCW Clock Pulse Width 5V ¾ 400 ¾ ¾ ns tSW Strobe Pulse Width 5V ¾ 1 ¾ ¾ us tSU Data Setup Time 5V ¾ 100 ¾ ¾ ns th Data Hold Time 5V ¾ 100 ¾ ¾ ns tCS Clock-Strobe Time 5V CLK rising edge to CS rising edge 1 ¾ ¾ ms tW Wait Time 5V CLK rising edge to CLK falling edge 1 ¾ ¾ ms Functional Description Display RAM and Display Mode Dimming Control The static display RAM is organized into 40´8 bits and stores the data transmitted from an external device to the HT16511 through 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 commands. It is assigned addresses in 8-bit unit as follows: HT16511 provides 8-step dimmer function on display by controlling the 3-bit binary command code. The full pulse width of grid signal is divides into 16 uniform sections by PWM (pulse width modulation) technology. S E G 1 0 0 0 3 0 6 0 9 0 C 0 F 1 2 1 5 1 8 1 B 1 E 2 1 2 4 2 7 2 A 2 D b 0 Note: H S E G 4 0 0 0 3 L 0 6 L 0 9 L 0 C L 0 F L 1 2 L 1 5 L 1 8 L 1 B L 1 E L 2 1 L 2 4 L 2 7 L 2 A L 2 D L H L H H H H H H H H H H H H H H H H H H H H H H H H H H H S E G 8 0 0 U 0 U 0 U 0 U 1 U 1 U 1 U 1 U 1 U 1 U 2 U 2 U 2 U 2 U 2 U U H H H 1 H 4 H 7 H A H D H 0 H 3 H 6 H 9 H C H F H 2 H 5 H 8 H B H E H S E G 1 2 0 1 L 0 4 L 0 7 L 0 A L 0 D L 1 0 L 1 3 L 1 6 L 1 9 L 1 C L 1 F L 2 2 L 2 5 L 2 8 L 2 B L 2 E L H H H H H H H H H H H H H H H H S E G 1 6 0 2 U 0 5 U 0 8 U 0 B U 0 E U 1 1 U 1 4 U 1 7 U 1 A U 1 D U 2 0 U 2 3 U 2 6 U 2 9 U 2 C U 2 F U H H H H H H H H H H H H H H H H S E G 2 D L D L D L D L D L D L D L D L D L D L D L D L D L D L D L D L The 16 uniform sections available form 8 steps dimmer via 3-bit binary code. The 8-step dimmer includes 1/16, 2/16, 4/16, 10/16, 11/16, 12/16, 13/16 and 14/16. The 1/16 pulse width indicates minimum lightness. The 14/16 pulse width represents maximum lightness (Refer to the display control command). 0 IG 1 IG 2 IG 3 IG 4 IG 5 IG 6 IG 7 IG 8 IG 9 IG 1 IG 1 IG 1 IG 1 IG 1 IG 1 IG 1 Key Matrix and Key-Input Data Storage RAM The key matrix scans the series key states at each level of the key strobe signal (S1/K1~S12/K12) output of the HT16511. The key strobe signal outputs are time-multiplexed signals from S1/K1~S12/K12. The states of inputs K0~K3 are sampled by strobe signal S1/K1~S12/K12 and latched into the register. 0 1 2 3 4 5 6 b 3 b 4 b 7 X X H L X X H U L o w e r H ig h e r 4 b its 4 b its Only the lower 4 bits of the addresses assigned to SEG17 through SEG20 are valid, the higher 4 bits are ignored. Rev. 1.10 5 September 18, 2003 HT16511 The key matrix is made up of a 12´4 matrix, as shown below. S 1 / K 1 S 2 / K 2 S 4 / K 4 S 3 / K 3 S 5 / K 5 S 6 / K 6 S 7 / K 7 S 8 / K 8 S 9 / K 9 S 1 0 / K 1 0 S 1 2 / K 1 2 S 1 1 / K 1 1 K 0 K 1 K 2 K 3 D e ta il K e y m a tr ix SW Data The data of each key is stored as illustrated below, and is read with the read command, starting from the least significant bit. K 0 ~ K 3 K 0 ~ K 3 S 1 /K 1 S 2 /K 2 S 3 /K 3 S 4 /K 4 S 5 /K 5 S 6 /K 6 S 7 /K 7 S 8 /K 8 S 9 /K 9 S 1 0 /K 1 0 S 1 0 /K 1 0 S 1 2 /K 1 2 The HT16511 provides an extra 4-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. Bits 5 through 8 of the SW data are 0. M S B 0 R e a d in g s e q u e n c e L S B 0 0 0 b 3 b 2 b 1 b 0 S W 0 S W 1 S W 2 S W 3 D o n 't c a r e b 0 b 1 b 2 b 3 b 4 b 5 b 6 b 7 Commands LED Port Commands set the display mode and status of the VFD driver. The LED port belongs to the CMOS output configuration. The first 1 byte input to the HT16511 through 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 commands/ data being transmitted are not valid (however, the commands/data previously transmitted remains valid). 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 is 0, the corresponding LED lights; when the bit is 1, the LED turns off. The data of bits 6 through 8 are ignored. M S B Rev. 1.10 These commands initialize the HT16511 and select the number of segments and the number of grids (1/8~1/16 duty, 12 segments to 20 segments). When these commands are executed, the display is forcibly turned off, and key scanning is also stopped. To resume display, the display command ²ON² must be executed. If the same mode is selected, nothing happens. L S B b 4 D o n 't c a r e · Display mode setting commands b 3 b 2 b 1 b 0 L E D L E D L E D L E D L E D 0 1 2 3 4 6 September 18, 2003 HT16511 M S B L S B 0 0 b 3 b 2 b 1 b 0 0 x x 1 0 0 1 0 0 1 0 1 1 0 1 1 1 0 1 1 0 1 1 1 1 1 1 D o n 't c a r e S e x : 0 : 1 : 0 : 1 : 0 : 1 : 0 : 1 : le c 8 9 1 1 1 1 1 1 1 ts d is p d ig its , d ig its , 0 d ig its 1 d ig its 2 d ig its 3 d ig its 4 d ig its 5 d ig its 6 d ig its la 2 1 , , , , , , , y m 0 s 9 s 1 8 1 7 1 6 1 5 1 4 1 3 1 2 o e g e g s e s e s e s e s e s e s e d e m e m e g m g m g m g m g m g m g m n ts n ts e n ts e n ts e n ts e n ts e n ts e n ts e n ts Note: Power-on status: 16-digit, 12 segment mode is selected. · Data setting commands These commands set the data write and data read modes. M S B L S B 0 b 3 1 b 2 b 1 b 0 S e 0 0 0 1 1 0 1 1 D o n 't c a r e ts : W : W : R : R d a ta r ite r ite e a d e a d w r ite a d a ta to d a ta to k e y d a S W d a n d re a d m o d e d is p la y m e m o r y L E D p o rt ta ta A d d r e s s in c r e m e n t m o d e s e ttin g s ( d is p la y m e m o r y ) 0 : In c r e m e n ts a d d r e s s a fte r d a ta h a s b e e n w r itte n 1 : F ix e s a d d r e s s T e s t m o d e s e ttin g s 0 : N o rm a l m o d e 1 : T e s t m o d e , u s e r d o n 't u s e Note: power-on status: normal mode operation and address increment mode are set. · Address setting commands These commands set the address of the display memory. M S B L S B 1 1 b 5 b 4 b 3 b 2 b 1 b 0 A d d re s s (0 0 H ~ 2 F H ) If address 30H or higher is set, data is ignored until a valid address is set. Note: power-on status: the address is set to 00H. · Display control commands M S B 1 L S B 0 b 3 D o n 't c a r e b 2 b 1 b 0 S e 0 0 0 0 0 1 0 1 1 0 1 0 1 1 1 1 ts d im 0 : S e 1 : S e 0 : S e 1 : S e 0 : S e 1 : S e 0 : S e 1 : S e m t p t p t p t p t p t p t p t p in g u ls u ls u ls u ls u ls u ls u ls u ls q u e w e w e w e w e w e w e w e w a id id id id id id id id n tity th to th to th to th to th to th to th to th to 1 /1 6 2 /1 6 4 /1 6 1 0 /1 1 1 /1 1 2 /1 1 3 /1 1 4 /1 6 6 6 6 6 T u r n s o n /o ff d is p la y 0 : D is p la y o ff ( k e y s c a n c o n tin u e s ) 1 : D is p la y o n Note: power-on status: 1-16 pulse width is set and the display is turned off. Key scanning will be stopped during power Rev. 1.10 7 September 18, 2003 HT16511 Timing Diagrams tr1 ( tr2 ) tf 9 0 % S n /G n 1 0 % tS W C S tC W tC tC W S C L K tS U th D I tP tP H L L H D O Key Scanning and Display Timing K e y s c a n d a ta S n /K n o u tp u t D ig it 1 D ig it 2 D ig it 3 D ig it n D ig it 1 G 1 o u tp u t G 2 o u tp u t 1 /1 6 tD IS P G 3 o u tp u t G n o u tp u t t @ 5 0 0 m s 1 fra m e = T ´ (n + 1 ) Note: One cycle of key scan consists of two frames, and data of 12´4 matrixes is stored in RAM. Rev. 1.10 8 September 18, 2003 HT16511 Serial Communication Format · Reception (command/data write) C S C L K 1 2 b 0 D I 3 b 1 7 b 2 8 b 6 b 7 · Transmission (data read) C S 1 C L K 2 b 0 D I 3 b 1 4 b 2 5 b 3 6 b 4 7 b 5 8 b 6 tW 1 2 3 4 5 6 b 7 b 0 D O A d a ta r e a d c o m m a n d is s e t b 1 b 2 b 3 b 4 b 5 D a ta is r e a d DO must be sure to connect an external pull-high resistor to this pin (1kW to 10kW). Note: When data is read, a wait time ²tW² of 1ms is necessary. · Updating display memory by incrementing address C S C L K D I C o m m a n d 1 C o m m a n d 2 C o m m a n d 3 D a ta 1 D a ta n C o m m a n d 4 Note: Command 1: sets display mode Command 2: sets data Command 3: sets address Data 1 to n: transfers display data (48 bytes max.) Command 4: controls display · Updating specific addresses C S C L K D I C o m m a n d 1 C o m m a n d 2 D a ta C o m m a n d 2 D a ta n Note: Command 1: sets data Command 2: sets address Data: display data Rev. 1.10 9 September 18, 2003 HT16511 Application Circuits R 7 R 8 R 9 R 1 0 D 1 D 2 D 3 D 4 D 5 D 6 D 7 D 8 D 9 V D D (5 V ) V D D R K 0 K 1 K 2 K 3 S 1 /K 1 S 2 /K 2 S 3 /K 3 S 4 /K 4 S 5 /K 5 S 6 /K 6 S 7 /K 7 S 8 /K 8 O S C D 1 0 D 1 1 D 1 2 S 1 S 2 S 3 S 4 S 5 S 6 S 7 S 8 S 9 S 1 0 S 1 1 S 1 2 S 9 /K 9 S 1 0 /K 1 0 S 1 1 /K 1 1 S 1 2 /K 1 2 V F D E f O S C V D D (5 V ) M C U S 1 3 /G 1 6 ~ S 2 0 /G 9 C S C L K D I H T 1 6 5 1 1 G 1 ~ G 8 R 1 D O L E D 0 V D D (5 V ) Note: R 2 L E D 1 R 3 L E D 2 R 4 L E D 3 R 5 S W 0 L E D 4 S W 1 S W 2 S W 3 V S S V E E -3 0 V R 6 ROSC=51kW for oscillator resistor R1=1~10kW for external pull-high resistor R2~R6=750W~1.2kW R7~R10=10kW for external pull-low resistor D1~D12=1N4001 Ef=Filament voltage for VFD Rev. 1.10 10 September 18, 2003 HT16511 Package Information 52-pin QFP (14´14) Outline Dimensions C H D 3 9 G 2 7 I 2 6 4 0 F A B E 1 4 5 2 K J 1 Symbol A Rev. 1.10 1 3 Dimensions in mm Min. Nom. Max. 18.80 ¾ 19.20 B 13.90 ¾ 14.10 C 18.80 ¾ 19.20 D 13.90 ¾ 14.10 E ¾ 0.65 ¾ F ¾ 0.40 ¾ G 2.50 ¾ 3.10 H ¾ ¾ 3.40 I ¾ 0.10 ¾ J 0.73 ¾ 1.03 K 0.10 ¾ 0.20 a 0° ¾ 7° 11 September 18, 2003 HT16511 Holtek Semiconductor Inc. (Headquarters) No.3, Creation Rd. II, Science Park, Hsinchu, Taiwan Tel: 886-3-563-1999 Fax: 886-3-563-1189 http://www.holtek.com.tw Holtek Semiconductor Inc. (Sales Office) 4F-2, No. 3-2, YuanQu St., Nankang Software Park, Taipei 115, Taiwan Tel: 886-2-2655-7070 Fax: 886-2-2655-7373 Fax: 886-2-2655-7383 (International sales hotline) Holtek Semiconductor (Shanghai) Inc. 7th Floor, Building 2, No.889, Yi Shan Rd., Shanghai, China Tel: 021-6485-5560 Fax: 021-6485-0313 http://www.holtek.com.cn Holtek Semiconductor (Hong Kong) Ltd. Block A, 3/F, Tin On Industrial Building, 777-779 Cheung Sha Wan Rd., Kowloon, Hong Kong Tel: 852-2-745-8288 Fax: 852-2-742-8657 Holmate Semiconductor, Inc. 46712 Fremont Blvd., Fremont, CA 94538 Tel: 510-252-9880 Fax: 510-252-9885 http://www.holmate.com Copyright Ó 2003 by HOLTEK SEMICONDUCTOR INC. The information appearing in this Data Sheet is believed to be accurate at the time of publication. However, Holtek assumes 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 http://www.holtek.com.tw. Rev. 1.10 12 September 18, 2003