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PDF HT6750A Data sheet ( Hoja de datos )
| Número de pieza | HT6750A | |
| Descripción | Date Printer | |
| Fabricantes | Holtek Semiconductor | |
| Logotipo |  |
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Features
· Operating voltage: 2.4V~5.5V
· Operating current: < 3mA at 3.0V
· Constant voltage output (1.8V±5%) at 2.4V~5.5V
operating for driving lamp (1.8V/40mA)
· LCD contrast can not distort at 2.4V~5.5V operating
· LCD display drive 1/3 duty, 1/2 bias, frame frequency
is 42.67Hz
· At power interrupt, data hold up > 1.0s
(between VDD and VSS connect a 0.1mF capacitor)
· Built-in power on reset function
HT6750A
Date Printer
· 32K crystal oscillator (Internal capacitor and resistor)
· Calendar and time adjustment
· Date imprinting modes
(Y/M/D, D/H/Min, Imprint off, M/D/Y, D/M/Y)
· Mode is selected by cyclically turning
· 4 film printing times is selectable or external input
control (30ms/45ms/60ms/external control)
· Direct resetting system
· Lamp output time control
· Provides module test circuit
General Description
The 6-Digital Timer is a camera data optical printer. Dis-
playing and printing of data (Year Month Day/Day Hour:
Minute/OFF/Month Day Year/Day Month Year) can be
selected by mode selection. Date updating is a fully au-
tomatic calendar from the year 1998.1.1 to 2049.12.31.
Block Diagram
C O M 1~C O M 3 TE S T2
O SCI
O SCO
O s c illa to r
D iv . 3 2 K
D iv . 6 0
D iv . 6 0
SEG O N
RESET
M ODE
SEL
SET
V.2
V.4
LC 1
LC 2
T
D
X
C o n tro l
C ir c u it
P r in t/L a m p
C o n tro l
D iv . 3 2 K
Y ear
C o u n te r
D iv . 2 8 , 2 9 ,
30 or31
D iv . 2 4
VDD
VSS
M UX M UX M UX
Im - P r in t M a r k L a m p
SEG 1
S E G 15
Rev. 1.00
1 January 17, 2003
1 page  
HT6750A
Functional Description
· 6-digit timer in 5 modes: Mode selection for 3 key
www.DataSheeatp4pUlic.caotimons
· Date from 1-1-²98 to 31-12-²49 (2049) automatic
updating, including leap years.
· Matrix address LCD interface in 1/3 duty, 1/2 bias,
frame frequency is 43Hz.
· Printing enable is ²Go low² trigger in X input. VXÜ1/2
VDD, Debounce in printing trigger: 1ms£TDEBOUNCE£2ms.
· After printing, ²¾² will blink 3 times at 1Hz rate.
· Print means lamp output ²LOW² to light lamp. Lamp
output sink current is 40mA Min. (Constant current
source ), typical 45mA (VDD=2.4V~5.5V).
· Printing time: 30ms, 45ms, 60ms or programmable
(determined by the control CPU of the camera), se-
lected by D or T and Topt inputs.
· Built-in crystal (32768Hz) oscillator circuit (capacitor
and resistor).
· At ²OFF² mode ( - - - - - - ), printing (Lamp on) and
data setting is inhibited in any case and printing ²¾²
mark OFF.
M
'Y M D
A s ia n C a le n d a r
D H :M
D a y , H o u r , M in u te
O ..
M
M D 'Y
M
D M 'Y
A m e r ic a n C a le n d a r E u r o p e a n C a le n d a r
· Default value at power on is ² ¢98 1 1² (ASIAN DATE ).
· Date and time cannot be set with printing ²¾² mark
ON.
· LCD segment test pin is provided, a ²SEGON² is
pull-low which will force all segments ON. This test pin
is normally pull-high through an on chip 1kW resistor.
· ²:² mark is still at time mode, at time setting, ²digit² se-
lected by SEL pin will blink at 1Hz and 1/2 duty rate.
· At setting mode (SET), printing ²¾² mark is OFF and
printing is inhibited.
· The selected digit (blinking) count up by one at short
intervals (1.0sec£TSET£1.25sec), when the ON key is
pressed for less than 1.0sec; if the SET key is pressed
longer than 1.25sec, the digit will count up rapidly at
8Hz rate.
· Printing is disabled during data and time setting.
T O N T O ..
Debounce time of MODE, SEL, SET key is:
ON recognition: when the ON key is pressed longer
than TON, ON is recognized.
31.25ms£TON£62.5ms,
OFF recognition: when the ON key is pressed longer
than TOFF , OFF is recognized; the next input has to
wait.
31.25ms£TOFF£62.5ms,
· If at least one key-ON time pulse is detected during
the ²TOFF² period, the time before the key-ON pulse is
regarded as the key-ON time.
The lamp light-up time is controlled depending on the
levels of D and T pins.
D T Lamp signal output time
H H 60ms
H L 30ms
L H Depend on X input pulse width
L L 45ms
· ²X² pin must be carefully protected, the system cannot
be reset when in ±200V and 200pF one-shot test.
(add external resistor 10kW series with the pad; it¢s
better if it works well without the resistor)
· At ²OFF² mode, no data can be set.
· The X input is rejected in some condition, such as:
¨ OFF mode
¨ Selection and Setting mode (In these condition the
lamp must be turned off)
· Power on reset and after crystal is stable (max. 2 sec)
· Regulator output voltage accuracy is 2V±3.0% (after
TRIM)
· Display in Day-Hour-Minute mode, in 24-hour system
(0~23)
Operation flowchart
M
'9 8 1 1
A s ia n C a le n d a r
1 0 :00
D a y , H o u r , M in u te
O ..
M
1 1 '9 8
M
1 1 '9 8
M
'9 8 1 1
A m e r ic a n C a le n d a r E u r o p e a n C a le n d a r A s ia n C a le n d a r
Mode selection sequence and initial value: (²MODE²
key)
In digit setting, press the ²SET² key
· The digit selected will blink at a 1hz rate.
· The blinking digit (selected digit) will count up by itself.
· If ²SET² key is pressed ³1sec, the digit will count up
rapidly at an 8Hz rate, otherwise count up by 1 every
time it¢s pressed (£1sec).
· When the colon (²:²) is blinking in the
Day-Hour-Minute mode, pressing the SET key will re-
set the seconds to 00.
Rev. 1.00
5 January 17, 2003
5 Page | ||
| Páginas | Total 8 Páginas | |
| PDF Descargar | [ Datasheet HT6750A.PDF ] | |
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