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HT1632 328 & 2416 LED Driver
Features
* Operating voltage: 2.4V~5.5V * Multiple LED display - 32 out bits/8 commons and * Serial MCU interface - CS, RD, WR, DATA * Data mode & command mode instruction * Cascading function for extended applications
24 out bits/16 commons
* Integrated display RAM - select 32 out bits &
(up to 5 HT1632s possible)
* Selectable NMOS open drain output driver and
8 commons for 644 display RAM, or select 24 outbits & 16 commons for 964 display RAM
* 16-level PWM brightness control * Integrated 256kHz RC oscillator
PMOS open drain output driver for commons
* 52-pin QFP package
Applications
* Industrial control indicator * Digital clock, thermometer, counter, voltmeter * Instrumentation readouts * Other consumer application * LED Displays
General Description
The HT1632 is a memory mapping LED display controller/driver, which can select a number of out bits and commons. These are 32 out bits & 8 commons and 24 out bits & 16 commons. The device supports 16-gradation LEDs for each out line using PWM control with software instructions. A serial interface is conveniently provided for the command mode and data mode. Only three or four lines are required for the interface between the host controller and the HT1632. The display can be extended by cascading the HT1632 for wider applications.
Block Diagram
VDD VSS D is p la y R A M
COM0 CS RD WR DATA Con an T im C ir c tro l d in g u it COM7 O U T B IT 0 LED D r iv e r O U T B IT 2 3 O U T B IT 2 4 /C O M 1 5 O U T B IT 3 1 /C O M 8 LED_VSS
OSC SYNC
T im in g G e n e ra to r
PW M
C o n tro l
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HT1632
Pin Assignment
OU OU OU LE OU OU OU OU OU OU OU OU LE TB TB TB D_ TB TB TB TB TB TB TB TB D_ IT 2 IT 2 IT 2 VS IT 1 IT 1 IT 1 IT 1 IT 1 IT 1 IT 1 IT 1 VS S S
52 51 50 49 48 47 46 45 44 43 42 41 40 1 2 3
2 0 1 2
3
4
5
6
7
8
9
OUT OUT OU OU OU OU OU OU LED OU OU OU OU
B IT 1 B IT 1 T B IT T B IT T B IT T B IT T B IT T B IT _VS T B IT T B IT T B IT T B IT S
1 0 9 8 7
5 4
39 38 37 36 35
6 5
7 6
H T1632
8 9 10
4 3 2 1 0
5 2 Q F P -A
11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26
34 33 32 31 30 29 28 27
OU OU OU OU OU LE OU OU OU OU CO CO CO
T B IT T B IT T B IT T B IT T B IT D_VS T B IT T B IT T B IT T B IT M7 M6 M5
23 24 25 26 27 S 28 29 30 31
/C /C /C /C /C /C /C /C
OM OM OM OM OM OM OM OM
15 14 13 12 11 10 9 8
COM COM COM COM COM VDD SYNC CS RD WR DATA OSC VSS 0 1 2 3 4
Pin Description
Pad Name OUTBIT0~OUTBIT23 OUTBIT24/COM15~ OUTBIT31/COM8 COM0~COM7 SYNC I/O O O O I/O Description Line drivers. These pins drive the LEDs. Drive LED output or Common output Common outputs Cascade synchronization input and output If the system clock is is sourced from an external clock source, the external clock source should be connected to this pad. If the on-chip RC oscillator is selected, this pad can be connected to a high or low level. If the cascade mode is selected, this pad is the driver clock signal. Serial data input or output with pull-high resistor WRITE clock input with pull-high resistor Data on the DATA lines are latched into the HT1632 on the rising edge of the WR signal. READ clock input with pull-high resistor. The HT1632 RAM data is clocked out on the falling edge of the RD signal. The clocked out data will appear on the DATA line. The host controller can use the next rising edge to latch the clocked out data. Chip select input with pull-high resistor When the CS line is high, the data and command read from or written to the HT1632 is disabled, and the serial interface circuit is also reset. If CS is low, the data and command transmission between the host controller and the HT1632 are all enabled. Negative power supply for driver circuit, ground. Negative power supply for logic circuit, ground. Positive power supply for logic and driver circuit.
OSC
I/O
DATA WR
I/O I
RD
I
CS
I
LED_VSS VSS VDD
3/4 3/4 3/4
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Absolute Maximum Ratings
Supply Voltage ...........................VSS-0.3V to VSS+5.5V Input Voltage.............................VSS-0.3V to VDD+0.3V Storage Temperature ............................-50C to 125C Operating Temperature...........................-40C to 85C
Note: These are stress ratings only. Stresses exceeding the range specified under Absolute Maximum Ratings 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 VDD IDD ISTB VIL VIH IOL1 IOH1 IOL2 IOH2 IOL3 IOH3 IOL4 RPH Parameter Operating Voltage Operating Current Standby Current Input Low Voltage Input High Voltage DATA DATA OSC, SYNC OSC, SYNC Common Sink Current Common Source Current LED Out Driver Pull-high Resistor Test Conditions VDD 3/4 5V 5V 5V 5V 5V 5V 5V 5V 5V 5V 5V 5V Conditions 3/4 No load, LED ON, on-chip RC oscillator No load, power down mode DATA, WR, CS, RD DATA, WR, CS, RD VOL=0.5V VOH=4.5V VOL=0.5V VOH=4.5V VOL=0.5V VOH=4.5V VOL=0.5V DATA, WR, CS, RD Min. 2.4 3/4 3/4 0 4 1.3 -0.9 2.6 -1.8 3/4 3/4 3/4 10 Typ. 5 3/4 3/4 3/4 3/4 2.6 -1.8 5.2 -3.6 50 -20 50 30 Max. 5.5 10 10 1 5 3/4 3/4 3/4 3/4 3/4 3/4 3/4 60
Ta=25C Unit V mA mA V V mA mA mA mA mA mA mA kW
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HT1632
A.C. Characteristics
Symbol fSYS fLED fCLK1 fCLK2 tCS Parameter System Clock LED Duty Cycle & Frame Frequency Serial Data Clock (WR pin) Serial Data Clock (RD pin) Serial Interface Reset Pulse Width WR, RD Input Pulse Width Rise/Fall Time Serial Data Clock Width (Figure 1) Setup Time for DATA to WR, RD Clock Width (Figure 2) Hold Time for DATA to WR, RD, Clock Width (Figure 2) Setup Time for CS to WR, RD, Clock Width (Figure 3) Hold Time for CS to WR, RD, Clock Width (Figure 3) Test Conditions VDD 5V 5V 5V 5V 5V 3/4 5V Read mode tr , t f tsu th tsu1 th1 3/4 3/4 3/4 3/4 3/4 3/4 3/4 3/4 3/4 3/4 3.34 120 120 120 100 100 Conditions On-chip RC oscillator 1/8 duty 1/16 duty Duty cycle 50% Duty cycle 50% CS Write mode Min. 3/4 3/4 3/4 4 3/4 250 1.67 Typ. 256 97.5 97.5 3/4 3/4 3/4 3/4 3/4 3/4 3/4 3/4 3/4 3/4 Max. 3/4 3/4 3/4 300 150 3/4 3/4 3/4 3/4 3/4 3/4 3/4 3/4 Ta=25C Unit kHz Hz Hz kHz kHz ns ms ns ns ns ns ns
tCLK
tf W R,RD C lo c k 90% 50% 10% tC
tr V tC
LK
DD
V a lid D a ta DATA 50% ts
u
V th
DD
LK
GND
GND V
DD
Figure 1
W R,RD C lo c k
50%
GND
Figure 2
tC
S
CS
50% ts
u1
V
DD
th
1
GND
V
DD
W R,RD C lo c k
50% F ir s t C lo c k L a s t C lo c k
GND
Figure 3
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HT1632
Functional Description
Display Memory - RAM The static display memory, RAM, is organised into 644 bits or 964 bits and stores the displayed data. If 32 out bits & 8 commons is selected, the RAM size is 644 bits. If 24 out bits & 16 commons is selected the RAM size is Com7 Out0 Out1 Out2 Out3 Out4 Out5 Out6 Out7 Out8 Out9 Out10 Out11 Out12 Out13 Out14 Out15 Out16 Out17 Out18 Out19 Out20 Out21 Out22 Out23 Out24 Out25 Out26 Out27 Out28 Out29 Out30 Out31 D3 D2 D1 D0 Com6 Com5 Com4 Addr. 01H 03H 05H 07H 09H 0BH 0DH 0FH 11H 13H 15H 17H 19H 1BH 1DH 1FH 21H 23H 25H 27H 29H 2BH 2DH 2FH 31H 33H 35H 37H 39H 3BH 3DH 3FH Data D3 D2 D1 D0 964 bits. The contents of the RAM are directly mapped to the contents of the LED driver. Data in the RAM can be accessed by the READ, WRITE, and READMODIFY-WRITE commands. The following table shows the mapping from the RAM to the LED pattern:
Com3
Com2
Com1
Com0
Addr. 00H 02H 04H 06H 08H 0AH 0CH 0EH 10H 12H 14H 16H 18H 1AH 1CH 1EH 20H 22H 24H 26H 28H 2AH 2CH 2EH 30H 32H 34H 36H 38H 3AH 3CH 3EH Data
32 Outbits & 8 Common for 644 Display RAM
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Com15 Com14 Com13 Com12 Out0 Out1 Out2 Out3 Out4 Out5 Out6 Out7 Out8 Out9 Out10 Out11 Out12 Out13 Out14 Out15 Out16 Out17 Out18 Out19 Out20 Out21 Out22 Out23 D3 D2 D1 D0 Addr. 03H 07H 0BH 0FH 13H 17H 1BH 1FH 23H 27H 2BH 2FH 33H 37H 3BH 3FH 43H 47H 4BH 4FH 53H 57H 5BH 5FH Data ......... D3 D2 D1 D0 ......... ......... Com3 Com2 Com1 Com0 Addr. 00H 04H 08H 0CH 10H 14H 18H 1CH 20H 24H 28H 2CH 30H 34H 38H 3CH 40H 44H 48H 4CH 50H 54H 58H 5CH Data
24 Outbits & 16 Common for 964 Display RAM
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HT1632
System Oscillator The HT1632 system clock is used to generate the time base clock frequency, LED-driving clock. The clock may be sourced from an on-chip RC oscillator (256kHz), or an external clock using the S/W setting. The configuration of the system oscillator is as shown. After the SYS DIS command is executed, the system clock will stop and the LED duty cycle generator will turn off. This command is, however, available only for the on-chip RC oscillator. Once the system clock stops, the LED display will become blank, and the time base will also lose its function. The LED OFF command is used to turn the LED duty cycle generator off. After the LED duty cycle generator switches off by issuing the LED OFF command, using the SYS DIS command reduces power consumption, serving as a system power down command. But if the external clock source is chosen as the system clock, using the SYS DIS command can neither turn the oscillator off nor execute the power down mode. The crystal oscillator option can be applied to connect an external frequency source to the OSC pin. In this case, the system fails to enter the power down mode, similar to the case in the external clock source operation. At the initial system power on, the HT1632 is in the SYS DIS state.
OSC E x te r n a l C lo c k S o u r c e O n - c h ip R C O s c illa to r 256kH z S y s te m C lo c k
Name LED OFF LED ON
Command Code
Function
10000000010X Turn off LED outputs 10000000011X Turn on LED outputs
ab=00: N-MOS open drain output and 8 common option ab=01: N-MOS open drain output and 16 common option Commons 1000010abXXX ab=10: P-MOS open Option drain output and 8 common option ab=11: P-MOS open drain output and 16 common option
V
DD
COM
C u r r e n t- lim itin g r e s is to r O U T B IT
System Oscillator Configuration
NMOS Open Drain Driving Mode Configuration
LED Driver The HT1632 has a 256 (328) and 384 (2416) pattern LED driver. It can be configured in a 328 or 2416 pattern and common pad N-MOS open drain output or P-MOS open drain output LED driver using the S/W configuration. This feature makes the HT1632 suitable for multiple LED applications. The LED-driving clock is derived from the system clock. The driving clock frequency is always 256kHz, an on-chip RC oscillator freq u e n c y, o r a n e x t e r n a l f r e q u e n c y. T h e L E D corresponding commands are summarized in the table. The bold form of 1 0 0, namely 1 0 0, indicates the command mode ID. If successive commands have been issued, the command mode ID except for the first command will be omitted. The LED OFF command turns the LED display off by disabling the LED duty cycle generator. The LED ON command, on the other hand, turns the LED display on by enabling the LED duty cycle generator.
LED Color Red Green
Current-limiting Resistor 120W 100W
Recommended Current-limiting Resistor for NMOS Open Drain Driving Mode
V
DD
COM
C u r r e n t- lim itin g r e s is to r O U T B IT
PMOS Open Drain Driving Mode Configuration
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HT1632
Blinker The HT1632 has display blinking capabilities. The blink function generates all LED blinking. The blink rates is 0.25ms LED on and 0.25ms LED off for one blinking period . This blinking function can be effectively performed by setting the BLINK ON or BLINK OFF command. Command Format The S/W setting can configure the HT1632. There are two mode commands to configure the HT1632 resources and to transfer the LED display data. The configuration mode of the HT1632 is knows as the command mode,with a command mode ID of 1 0 0. The command mode consists of a system configuration command, a system frequency selection command, a LED configuration command, and an operating command. The data mode, on the other hand, includes READ, WRITE, and READ-MODIFY-WRITE operations. The following are the data mode ID and the command mode ID: Operation READ WRITE READ-MODIFY-WRITE COMMAND Mode Data Data Data Command ID 110 101 101 100 The mode command should be issued before the data or command is transferred. If successive commands have been issued, the command mode ID, namely 1 0 0, can be omitted. While the system is operating in the non-successive command or the non-successive address data mode, the CS pin should be set to 1 and the previous operation mode will be reset also. Once the CS pin returns to 0, a new operation mode ID should be issued first. Interfacing Only four lines are required to interface to the HT1632. The CS line is used to initialise the serial interface circuit and to terminate the communication between the host controller and the HT1632. If the CS pin is set to 1, the data and command issued between the host controller and the HT1632 are first disabled and then initialised. Before issuing a mode command or mode switching, a high level pulse is required to initialise the serial interface of the HT1632. The DATA line is the serial data input/output line. Data to be read or written or commands to be written have to be passed through the DATA line. The RD line is the READ clock input. Data in the RAM is clocked out on the falling edge of the RD signal, and the clocked out data will then appear on the DATA line. It is recommended that the host controller reads in the correct data during the interval between the rising edge and the next falling edge of the RD signal. The WR line is the WRITE clock input. The data, address, and command on the DATA line are all clocked into the HT1632 on the rising edge of the WR signal.
LED
T u rn O n 0 .2 5 m s
T u rn O ff 0 .2 5 m s B lin k O n B lin k O ff
Example of Waveform for Blinker
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HT1632
Timing Diagrams
READ Mode - Command Code = 1 1 0
CS
WR
RD
DATA
1
1
0
A6 A5 A4 A3 A2 A1 A0 D0D1 D2 D3 M e m o ry A d d re s s 1 (M A 1 ) D a ta (M A 1 )
1
1
0
A6A5 A4 A3 A2 A1 A0 D0D1 D2 D3 M e m o ry A d d re s s 2 (M A 2 ) D a ta (M A 2 )
READ Mode - Successive Address Reading
CS
WR
RD
DATA
1
1
0
A6 A5 A4 A3 A2 A1 A0 D0D1 D2 D3 D0D1 D2 D3 D0D1 D2 D3 D0D1 D2 D3 D0 M e m o ry A d d re s s (M A ) D a ta (M A ) D a ta (M A + 1 ) D a ta (M A + 2 ) D a ta (M A + 3 )
WRITE Mode - Command Code = 1 0 1
CS
WR
DATA
1
0
1
A6A5 A4 A3 A2 A1 A0 D0D1 D2 D3 M e m o ry A d d re s s 1 (M A 1 ) D a ta (M A 1 )
1
0
1
A6A5 A4 A3 A2 A1 A0 D0D1 D2 D3 M e m o ry A d d re s s 2 (M A 2 ) D a ta (M A 2 )
WRITE Mode - Successive Address Writing
CS WR DATA 1 0 1 A6 A5 A4 A3 A2 A1 A0 D0D1 D2 D3 D0D1 D2 D3 D0D1 D2 D3 D0D1 D2 D3 D0 M e m o ry A d d re s s (M A ) D a ta (M A ) D a ta (M A + 1 ) D a ta (M A + 2 ) D a ta (M A + 3 )
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HT1632
READ-MODIFY-WRITE Mode - Command Code = 1 0 1
CS WR RD DATA 1 0 1 A6 A5 A4 A3 A2 A1 A0 D0D1 D2 D3 D0D1 D2 D3 M e m o ry A d d re s s 1 (M A 1 ) D a ta (M A 1 ) D a ta (M A 1 ) 1 0 1 A6A5 A4 A3 A2 A1A0 D0D1 D2 D3 M e m o ry A d d re s s 2 (M A 2 ) D a ta (M A 2 )
READ-MODIFY-WRITE Mode - Successive Address Accessing
CS WR RD DATA 1 0 1 A6 A5 A4 A3 A2 A1 A0 D0D1 D2 D3 D0D1 D2 D3 D0D1 D2 D3 D0D1 D2 D3 D0D1 D2 D3 D0 M e m o ry A d d re s s (M A ) D a ta (M A ) D a ta (M A ) D a ta (M A + 1 ) D a ta (M A + 1 ) D a ta (M A + 2 )
Command Mode - Command Code = 1 0 0
CS
WR
DATA
1
0
0
C8C7C6C5C4 C3C2C1C0 C8C7C6C5C4 C3C2C1C0 Com m and 1 C o m m a n d ... Com m and i
Com m and or D a ta M o d e
Mode - Data and Command Mode
CS
WR
DATA Com m and or D a ta M o d e A d d re s s a n d D a ta Com m and or D a ta M o d e A d d re s s a n d D a ta Com m and or D a ta M o d e A d d re s s a n d D a ta
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HT1632
Application Circuits
Single Connect Example for 32 Outbits & 8 Commons
V
DD
COM0 COM1 COM2 CS WR RD DATA CO M 0~ COM7 COM3 COM4 COM5 COM6 COM7 OSC O U T B IT 0 ~ O U T B IT 3 1 LED M a tr ix
CS WR RD DATA MCU
H T1632
Note: Common & outbit are all NMOS open drain output structures and only supply sink current.
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HT1632
Single Connect Example for 24 Outbits & 16 Commons
COM0 COM1 CS WR RD DATA MCU CS WR RD DATA CO M 0~ CO M 15 COM3 COM4 COM5 COM6 COM7 COM8 COM9 H T1632 CO M 10 CO M 11 CO M 12 CO M 13 CO M 14 OSC CO M 15 COM2
O U T B IT 0 ~ O U T B IT 2 3 LED M a tr ix
Note:
Outbit are NMOS open drain output structures and only supply sink current, common are PMOS open drain output structures and only supply source current
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HT1632
Cascade Connect Example for 32 Outbits & 8 Commons
CS1 CS2 CS3 WR RD DATA V
DD
MCU
COM0 CS WR RD DATA OSC SYNC H T1632 (M a s te r) O U T B IT 0 ~ O U T B IT 3 1 3 2 O u tb it D r iv e r s O U T B IT 0 O U T B IT 3 1 CO M 0~ COM7 8 Com m on D r iv e r s COM7 V
DD
LED M a tr ix
CS WR RD DATA OSC SYNC H T1632 (S la v e ) O U T B IT 0 ~ O U T B IT 3 1 3 2 O u tb it D r iv e r s O U T B IT 0 O U T B IT 3 1 LED M a tr ix
CS WR RD DATA H T1632 (S la v e ) O U T B IT 0 ~ O U T B IT 3 1 3 2 O u tb it D r iv e r s O U T B IT 0 O U T B IT 3 1 LED M a tr ix
OSC SYNC
Note:
It also can set cascade mode by software. User must set the Slaves in external clock mode with command. The CS pin must be connected to MCU individually for independent read-write.
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HT1632
Cascade Control Flow
Pow eron
S Y S D IS ( M a s te r , S la v e )
C o m m o n s O p tio n ( M a s te r , S la v e )
M a s te r M o d e (M a s te r)
S la v e M o d e ( S la v e )
SYS ON ( M a s te r , S la v e )
LED O N ( M a s te r , S la v e )
W r ite R A M D a ta ( M a s te r , S la v e )
U p d a te R A M D a ta ( M a s te r , S la v e )
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HT1632
Command Summary
Name READ WRITE READ-MODIFYWRITE SYS DIS SYS EN LED OFF LED ON BLINK OFF BLINK ON SLAVE MODE ID Command Code D/C D D D C C C C C C Function Read data from the RAM Write data to the RAM Read and Write data to the RAM Turn off both system oscillator and LED duty Yes cycle generator Turn on system oscillator Turn off LED duty cycle generator Turn on LED duty cycle generator Turn off blinking function Turn on blinking function Set slave mode and clock source from external clock Set master mode and clock source on-chip RC oscillator, the system clock output to OSC pin C C System clock source, on-chip RC oscillator Yes System clock source, external clock source ab=00: N-MOS open drain output and 8 common option ab=01: N-MOS open drain output and 16 common option ab=10: P-MOS open drain output and 8 common option ab=11: P-MOS open drain output and 16 common option PWM 1/16 duty PWM 2/16 duty PWM 3/16 duty PWM 4/16 duty PWM 5/16 duty PWM 6/16 duty PWM 7/16 duty PWM 8/16 duty PWM 9/16 duty PWM 10/16 duty PWM 11/16 duty PWM 12/16 duty PWM 13/16 duty PWM 14/16 duty PWM 15/16 duty PWM 16/16 duty Yes Yes Def. 1 1 0 A6A5A4A3A2A1A0D0D1D2D3 1 0 1 A6A5A4A3A2A1A0D0D1D2D3 1 0 1 A6A5A4A3A2A1A0D0D1D2D3 1 0 0 0000-0000-X 1 0 0 0000-0001-X 1 0 0 0000-0010-X 1 0 0 0000-0011-X 1 0 0 0000-1000-X 1 0 0 0000-1001-X 1 0 0 0001-00XX-X
MASTER MODE RC EXT CLK
1 0 0 0001-01XX-X 1 0 0 0001-10XX-X 1 0 0 0001-11XX-X
COMMONS OPTION
1 0 0 0010-abXX-X
C
ab =10
1 0 0 101X-0000-X 1 0 0 101X-0001-X 1 0 0 101X-0010-X 1 0 0 101X-0011-X 1 0 0 101X-0100-X 1 0 0 101X-0101-X 1 0 0 101X-0110-X PWM Duty 1 0 0 101X-0111-X 1 0 0 101X-1000-X 1 0 0 101X-1001-X 1 0 0 101X-1010-X 1 0 0 101X-1011-X 1 0 0 101X-1100-X 1 0 0 101X-1101-X 1 0 0 101X-1110-X 1 0 0 101X-1111-X
C C C C C C C C C C C C C C C C
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HT1632
Package Information
52-pin QFP (1414) Outline Dimensions
C D 39 27 G H
I 40 26 F A B E
52
14 K J 1 13
Symbol A B C D E F G H I J K a
Dimensions in mm Min. 17.3 13.9 17.3 13.9 3/4 3/4 2.5 3/4 3/4 0.73 0.1 0 Nom. 3/4 3/4 3/4 3/4 1 0.4 3/4 3/4 0.1 3/4 3/4 3/4 Max. 17.5 14.1 17.5 14.1 3/4 3/4 3.1 3.4 3/4 1.03 0.2 7
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HT1632
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: 86-21-6485-5560 Fax: 86-21-6485-0313 http://www.holtek.com.cn Holtek Semiconductor Inc. (Shenzhen Sales Office) 5/F, Unit A, Productivity Building, Cross of Science M 3rd Road and Gaoxin M 2nd Road, Science Park, Nanshan District, Shenzhen, China 518057 Tel: 86-755-8616-9908, 86-755-8616-9308 Fax: 86-755-8616-9722 Holtek Semiconductor Inc. (Beijing Sales Office) Suite 1721, Jinyu Tower, A129 West Xuan Wu Men Street, Xicheng District, Beijing, China 100031 Tel: 86-10-6641-0030, 86-10-6641-7751, 86-10-6641-7752 Fax: 86-10-6641-0125 Holtek Semiconductor Inc. (Chengdu Sales Office) 709, Building 3, Champagne Plaza, No.97 Dongda Street, Chengdu, Sichuan, China 610016 Tel: 86-28-6653-6590 Fax: 86-28-6653-6591 Holtek Semiconductor (USA), Inc. (North America Sales Office) 46729 Fremont Blvd., Fremont, CA 94538 Tel: 1-510-252-9880 Fax: 1-510-252-9885 http://www.holtek.com
Copyright O 2007 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. Holteks 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.
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