HT16515 1/4 to 1/12 Duty VFD Controller Features · Logic voltage: 5V · 4 LED output ports (20mA max.) · High-voltage output: VDD-35V max. · No external resistors necessary for driver output (provides PMOS open-drain and pull-low resistor output) · Multiple display (16-segment & 12-digit to 24-segment & 4-digit) · Serial interface with MCU (CLK, CS, DI, DO) · 16´2 matrix key scanning · 44-pin QFP package · 8 steps dimmer circuit Applications · Consumer products panel function control · Other similar applications for panel function control · Industrial measuring instrument panel function control General Description HT16515 is a VFD (Vacuum Fluorescent Display) controller/driver that is driven on a 1/4 to 1/12 duty factor. It consists of 16 segment output lines, 4 grid output lines, 8 segment/grid output drive lines, 4 LED output ports, a control circuit, a display memory, and a key scan circuit. Serial data inputs to the HT16515 through a three-line serial interface. This VFD controller/driver is an ideal MCU peripheral device. 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 4 - B it ´ 1 2 W o r d s 2 4 - B it O u tp u t L a tc h 2 4 1 6 C S O S C S e g 1 /K S 1 S e g 1 6 /K S 1 6 8 O S C T im in g G e n e r a to r K e y S c a n K e y D a ta M e m o ry (2 ´ 1 6 ) D a ta S e le c to r 1 2 - B it S h ift R e g is te r K e y 0 ~ K e y 1 4 - B it L a tc h 8 M u ltip le x e d D r iv e r S e g 1 7 /G r id 1 2 S e g 2 4 /G r id 5 8 4 1 2 G r id D r iv e r G r id 1 G r id 4 D im m in g C ir c u it L E D 0 ~ L E D 3 Rev. 1.00 S e g m e n t D r iv e r V D D 1 V S S V E E December 19, 2003 HT16515 3 4 6 0 1 2 3 4 5 S 1 S 1 S 1 S 1 S 1 S 1 S 1 6 /K 5 /K 4 /K 3 /K 2 /K 1 /K 0 /K E g 1 g 1 g 1 g 1 g 1 g 1 g 1 V E S e S e S e S e S e S e S e S e g 1 9 /G r id 1 0 S e g 1 8 /G r id 1 1 S e g 1 7 /G r id 1 2 Pin Assignment 3 3 3 2 3 1 3 0 2 9 2 8 2 7 2 6 2 5 2 4 2 3 2 2 S e g 9 /K S 9 3 5 2 1 3 6 2 0 6 3 7 1 9 S e g 2 4 /G r id 5 G r id 4 G r id 3 3 8 S e g 8 /K S 8 S e g 7 /K S 7 S e g 6 /K S 6 S e S e S e S e g 2 g 2 g 2 g 2 0 /G 1 /G 2 /G 3 /G r id r id r id r id G r id G r id V D V S 9 8 7 4 0 2 1 D 1 6 1 5 4 2 1 4 4 3 1 3 1 3 2 4 5 6 S e S e S e S e S e V D V S 1 7 4 1 4 4 S 1 8 0 6 $ # # " " 3 . 2 3 9 7 8 9 1 0 1 1 1 2 g 5 g 4 g 3 g 2 g 1 D S /K /K /K /K /K S 5 S 4 S 3 S 2 S 1 K E Y 0 3 2 1 0 K E Y 1 C S C L K D I D O O S C L E D L E D L E D L E D Pad Assignment S e g 2 0 /G r id 9 S e g 2 1 /G r id 8 S e g 2 2 /G r id 7 S e g 2 3 /G r id 6 S e g 2 4 /G r id 5 G r id 4 G r id 3 G r id 2 G r id 1 V D D V S S 4 4 L E D 0 1 L E D 1 2 4 3 3 8 3 5 3 6 3 7 S e g 1 9 /G r id 1 0 3 2 S e g 1 8 /G r id 1 1 3 1 S e g 1 7 /G r id 1 2 3 0 V E E 3 4 3 L E D 2 L E D 3 3 9 4 0 4 1 4 2 3 3 4 (0 ,0 ) O S C 5 2 9 S e g 1 6 /K S 1 6 D O 6 2 8 S e g 1 5 /K S 1 5 7 2 7 S e g 1 4 /K S 1 4 2 6 S e g 1 3 /K S 1 3 2 5 S e g 1 2 /K S 1 2 2 4 S e g 1 1 /K S 1 1 2 3 S e g 1 0 /K S 1 0 D I C L K 8 C S 9 K E Y 0 1 0 K E Y 1 1 1 1 3 1 4 1 5 1 6 1 7 1 8 1 9 2 0 2 1 2 2 1 2 S e g 9 /K S 9 S e g 8 /K S 8 S e g 6 /K S 6 S e g 7 /K S 7 S e g 5 /K S 5 S e g 4 /K S 4 S e g 2 /K S 2 S e g 3 /K S 3 S e g 1 /K S 1 V S S V D D Chip Size: * The IC substrate should be connected to VSS in the PCB layout artwork. Rev. 1.00 2 December 19, 2003 HT16515 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 -962.50 -962.50 -962.50 -962.50 -962.50 -962.50 -962.50 -962.50 -962.50 -962.50 -962.50 -689.60 -460.45 -344.25 -242.85 -141.45 -40.05 61.35 162.75 264.15 365.55 466.95 600.00 495.00 380.20 275.20 -107.20 -235.60 -366.00 -471.00 -576.00 -681.00 -786.00 -772.45 -595.30 -595.30 -595.30 -595.30 -595.30 -595.30 -595.30 -595.30 -595.30 -595.30 23 834.10 834.10 834.10 834.10 834.10 834.10 834.10 987.30 987.30 987.30 987.30 610.30 508.90 407.50 306.10 204.70 103.30 1.90 -99.50 -200.90 -317.10 -624.50 -754.00 -652.60 -551.20 -449.80 -348.40 -247.00 -145.60 0.50 130.50 382.05 734.05 594.40 594.40 594.40 594.40 594.40 594.40 594.40 594.40 594.40 594.40 756.80 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 Pin Description Pin No. Pin Name I/O Description 1~4 LED3~LED0 O LED driver output ports. This is a CMOS output pin and maximum driving current up to +20mA. 5 OSC I Connected to an external resistor or an RC oscillator circuit. 6 DO O Data output pin, output serial data at falling edge of shift clock, starting from the lower bit. This is N-ch open-drain output pin. 7 DI I Data input pin, input serial data at rising edge of shift clock, starting from the lower bit. 8 CLK I Clock input pin. Reads serial data at the rising edge, and outputs data at the falling edge. 9 CS I Initializes serial interface at the rising or falling edge of the HT16515. Then it waits to receive a command. Data input after CS has fallen is processed, current processing is stopped, and the serial interface is initialized. While CS is high, CLK is ignored. 10, 11 Key0, Key1 I Key-in data input to these pins are latched at the end of the display cycle. 12, 44 VSS ¾ Negative power supply, ground 13, 43 VDD ¾ Positive power supply 14~29 Seg1/KS1~Seg16/KS16 O High voltage output, segment output pins, dual function as key source. This is PMOS open-drain and pull-low resistor output. 30 VEE ¾ VFD power supply 31~38 Seg17/Grid12~ Seg24/Grid5 O High voltage output, these pins are selectable for segment or grid output. This is PMOS open-drain and pull-low resistor output. 39~42 Grid4~Grid1 O High voltage output, grids output pin. This is PMOS open-drain and pull-low resistor output. Rev. 1.00 3 December 19, 2003 HT16515 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=82kW 350 500 650 kHz RPL Output Pull-low Resistor 5V Driver output 40 65 120 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~LED3 20 ¾ ¾ mA IOH1 LED Source Current 5V VOH=0.9VDD, LED0~LED3 -3 ¾ ¾ mA IOH21 Segment 1~16 Source Current 5V VOH=VDD-2V -3 ¾ ¾ mA IOH22 Segment 17~24, Grid 1~4 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 VH Hysteresis Voltage ¾ CLK, DIN, CS ¾ 0.35 ¾ V VOH1 High-level Output Voltage 5V LED0~LED3, IOH1=-3mA 0.9VDD ¾ VDD V VOL1 Low-level Output Voltage 5V LED0~LED3, IOL1=20mA 0 ¾ 1 V VOL2 Low-level Output Voltage 5V DO, IOL2=4mA 0 ¾ 0.4 V Rev. 1.00 4 December 19, 2003 HT16515 A.C. Characteristics Symbol tPHL Ta=25°C Test Conditions Parameter Min. Typ. Max. Unit ¾ ¾ 300 ns 5V CLK®DO CL=15pF, RL=10kW ¾ ¾ 300 ns 5V CL=300pF, S1~S16 ¾ ¾ 2 ms 5V CL=300pF, G1~G4 S17/G12~S24/G5 ¾ ¾ 0.5 ms 5V Logic Supply Voltage tPLH tr1 Rise Time tr2 Conditions VDD 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 stores the data transmitted from an external device to the HT16515 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 as addresses in 8-bit unit as follows: HT16515 provides an 8-step dimmer function on display by controlling the 3-bit binary command code. The full pulse width of grid signal is divided 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 b 0 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 H L 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 U 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 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 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 H H H H H H H H H H H H S E G 2 0 0 2 L 0 5 L 0 8 L 0 B L 0 E L 1 1 L 1 4 L 1 7 L 1 A L 1 D L 2 0 L 2 3 L S E G 2 U D H U D H U D H U D H U D H U D H U D H U D H U D H U D H U D H U D H The 16 uniform sections available form an 8-step 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). 4 IG 1 IG 2 IG 3 IG 4 IG 5 IG 6 IG 7 IG 8 IG 9 IG 1 0 IG 1 1 IG 1 2 Key Matrix and Key-Input Data Storage RAM The key matrix scans the series key states at each level of the key strobe signal (Seg1/K1~Seg16/K16) output of the HT16515. The key strobe signal outputs are time-multiplexed signals from Seg1/K1~Seg16/K16. The states of inputs K0 and K1 are sampled by strobe signal Seg1/K1~Seg16/K16 and latched into the register. b 3 b 4 b 7 X X H U X X H L L o w e r H ig h e r 4 b its 4 b its Rev. 1.00 5 December 19, 2003 HT16515 The key matrix is made up of a 16´2 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 1 / K 1 1 S 1 2 / K 1 2 S 1 3 / K 1 3 S 1 4 / K 1 4 S 1 5 / K 1 5 S 1 6 / K 1 6 K E Y 1 K E Y 2 The data of each key is stored as illustrated below, and is read with the read command, starting from the least significant bit. K e y 1 K e y 2 K e y 1 K e y 2 K e y 1 K e y 2 K e y 1 K e y 2 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 1 /K 1 1 S 1 2 /K 1 2 S 1 3 /K 1 3 S 1 4 /K 1 4 S 1 5 /K 1 5 S 1 6 /K 1 6 b 0 b 2 b 4 b 6 b 1 b 3 b 5 Commands Commands set the display mode and status of the VFD driver. The first 1 byte input to the HT16515 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). R e a d in g S e q u e n c e b 7 LED Port · Display mode setting commands The LED port is of the CMOS output configuration. These commands initialize the HT16515 and select the number of segments and the number of grids (1/4~1/12 duty, 16 to 24 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. Data is written to the LED port with the write command, starting from the 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 up; when the bit is 1, the LED turns off. The data of bits 4 through 7 are ignored. M S B 0 M S B L S B 0 b 3 b 2 b 1 b 0 L S B b 3 D o n 't c a r e b 2 b 1 b 0 D o n 't c a r e L E D L E D L E D L E D 0 1 2 3 Note: Rev. 1.00 6 0 0 0 0 0 0 0 0 0 1 0 1 0 1 0 1 1 x S 0 0 0 1 1 0 1 1 0 0 0 1 1 0 1 1 x x : e le : : : : : : : : c ts 4 5 6 7 8 9 1 0 1 1 1 2 D d ig d ig d ig d ig d ig d ig d ig d ig d ig is p its its its its its its its its its la y , 2 4 , 2 3 , 2 2 , 2 1 , 2 0 , 1 9 , 1 8 , 1 7 , 1 6 M o s e s e s e s e s e s e s e s e s e d e g m g m g m g m g m g m g m g m g m e n e n e n e n e n e n e n e n e n ts ts ts ts ts ts ts ts ts Power-on status: 12-digit, 16 segment mode is selected. December 19, 2003 HT16515 · 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 : D d a ta r ite r ite e a d o n 't w d a d a k e c a r ite ta ta y d re a n d re a d m o d e to d is p la y m e m o r y to L E D p o rt a 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 1 L S B b 5 1 b 4 b 3 b 2 b 1 b 0 A d d re s s (0 0 H ~ 2 3 H ) If address 24H 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 0 : 1 : 0 : 1 : 0 : 1 : 0 : 1 : d im S e S e S e S e S e S e S e 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-on status. Rev. 1.00 7 December 19, 2003 HT16515 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 scanning consists of two frames, and data of 16´2 matrixes is stored in the RAM. Rev. 1.00 8 December 19, 2003 HT16515 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 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 (36 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. 1.00 9 December 19, 2003 HT16515 Application Circuits R 7 R 8 D 1 O S C R K e y 0 K e y 1 S 1 /K 1 D 2 S 2 /K 2 D 3 S 3 /K 3 D 4 S 4 /K 4 D 5 S 5 /K 5 D 6 S 6 /K 6 D 7 S 7 /K 7 D 8 S 8 /K 8 D 9 S 9 /K 9 D 1 0 D 1 1 D 1 2 D 1 3 D 1 4 D 1 5 D 1 S S S S S S S S S S 1 S 1 S 1 S 1 S 1 S 1 S 1 6 1 2 3 4 5 6 7 8 9 0 1 3 2 V F D 4 E f 5 6 S 1 0 /K 1 0 S 1 1 /K 1 1 S 1 2 /K 1 2 S 1 3 /K 1 3 S 1 4 /K 1 4 S 1 5 /K 1 5 S 1 6 /K 1 6 O S C V D D (5 V ) M C U S 1 7 /G 1 2 ~ S 2 4 /G 5 C S C L K D I 0 6 $ # # G 1 ~ G 4 R 1 D O L E D 0 V D D (5 V ) R 2 L E D 1 R 3 L E D 2 R 4 L E D 3 V V E E C + 5 V Note: V S S D D R 5 -3 0 V ROSC=82kW for oscillator resistor R1=1~10kW for external pull-high resistor R2~R6=750W~1.2kW R7~R8=10kW for external pull-low resistor D1~D6=1N4001 Ef=Filament voltage for VFD C=0.1mF~1.0mF Rev. 1.00 10 December 19, 2003 HT16515 Package Information 44-pin QFP (10´10) Outline Dimensions H C D G 2 3 3 3 I 3 4 2 2 F A B E 1 2 4 4 K a J 1 Symbol Rev. 1.00 1 1 Dimensions in mm Min. Nom. Max. A 13 ¾ 13.40 B 9.90 ¾ 10.10 C 13 ¾ 13.40 D 9.90 ¾ 10.10 E ¾ 0.80 ¾ F ¾ 0.30 ¾ G 1.90 ¾ 2.20 H ¾ ¾ 2.70 I ¾ 0.10 ¾ J 0.73 ¾ 0.93 K 0.10 ¾ 0.20 a 0° ¾ 7° 11 December 19, 2003 HT16515 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. (Taipei 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 Inc. (Shanghai Sales Office) 7th Floor, Building 2, No.889, Yi Shan Rd., Shanghai, China 200233 Tel: 021-6485-5560 Fax: 021-6485-0313 http://www.holtek.com.cn Holtek Semiconductor Inc. (Shenzhen Sales Office) 43F, SEG Plaza, Shen Nan Zhong Road, Shenzhen, China 518031 Tel: 0755-8346-5589 Fax: 0755-8346-5590 ISDN: 0755-8346-5591 Holtek Semiconductor Inc. (Beijing Sales Office) Suite 1721, Jinyu Tower, A129 West Xuan Wu Men Street, Xicheng District, Beijing, China 100031 Tel: 010-6641-0030, 6641-7751, 6641-7752 Fax: 010-6641-0125 Holmate Semiconductor, Inc. (North America Sales Office) 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. 1.00 12 December 19, 2003