HT6750A Просмотр технического описания (PDF) - Holtek Semiconductor
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HT6750A Datasheet PDF : 8 Pages
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HT6750A
Pad Description
Pad No.
Pad Name
I/O
Internal
Connection
Description
1, 2
VSS
¾
¾
Negative power supply, ground
3,
19, 20
COM1
COM3, COM2
O
CMOS Output for LCD panel common
4~18 SEG1~SEG15 O
CMOS LCD segment output driver
21
MODE
I
CMOS with
Pull-high
Mode select input pin (Internal pull-high 75K)
22
SEL
I
CMOS with
Pull-high
Correction digit shift switch (Internal pull-high 75K)
23
SET
I
CMOS with
Pull-high
Correction digit data (Internal pull-high 75K)
24
SEGON
I
CMOS with
Pull-high
Est pin, if pull-low will force all segment ²ON²
25
RESET
I
CMOS with
Pull-low
External Reset input (Internal pull-low, 50K)
26
TEST1
I
CMOS with
Pull-low
Test pin (not for customer)
27
OSCO
O
CMOS Crystal oscillator output pin
28
OSCI
I
CMOS Crystal oscillator input pin
29, 30 VDD
¾
¾
Positive power supply
31
VF4
O
CMOS Double reference voltage
32, 33 LC2, LC1
I
CMOS Connected to 0.1mF capacitor
34
VF2
O
CMOS Reference voltage
35~40
41~44
45
RF1~RF6
TR1~TR4
T
46
D
47
X
I
¾
Adjust regulator output voltage, TRIM PIN
I
¾
Adjust constant voltage and drive lamp output pin (Open drain)
I
CMOS with
Pull-high
Imprint time select input (Internal pull-high 75K with ²Latch type²)
I
CMOS with Imprint time external control input (Internal pull-high 75K with
Pull-high ²Latch type²)
I
CMOS with
Pull-high
Imprint trigger input pin (Internal pull-high 75K)*
48
TEST2
49
LAMP
I
CMOS with For coustomer test ²PRINTING LCD² use only, pull-low will force
Pull-high Lamp ²ON² and other function is OK (Internal pull-high 75K)**
O
CMOS Drive lamp output pin (Open drain)
Note: * The X input has no effect in OFF mode, selection and setting mode; the lamp will be turned off automatically.
** The TEST2 has no effect in selection and setting mode; the lamp will be turned off automatically.
Absolute Maximum Ratings
Supply Voltage .......................................................5.5V
Storage Temperature ............................ -20°C to 60°C
Input Voltage ......................................................... 5.5V
Operating Temperature...............................0°C to 50°C
Static Electricity (OFF Power)...................................................................................200pF, ±200V, 10 times to each pin
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 reliabil-
ity.
Rev. 1.00
3
January 17, 2003
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