HT16566 Holtek Semiconductor, HT16566 Datasheet - Page 2

• Manufacturer Part Number: HT16566
• Description: 1/2 Duty VFD Digital Clock
• Manufacturer: Holtek Semiconductor

DataSheet.in
Pin Assignment
Note: * col indicates a blink colon and col indicates a continuous light colon.
Pin Description
Rev. 1.00
VCC
VDD
VSS
DIM1
DIM2
A/C
ZA
HS
MS
BLANK
XT
XT
TEST
64Hz
GR1
GR2
1a,3a ~
2b,4b,4c
Pin Name
I/O
O
O
O
O
O
O
I
I
I
I
I
I
I
I
I
High voltage power supply pin.
Built-in regulator voltage output pin for the device internal circuits.
Ground pin.
Illumination level control pins.
Internally connected to pull-down resistors.
When the A/C pin is low, the internal circuits are reset.
The reset pulse width should be more than 2 s.
Internally connected to a pull-high resistor.
Zero Adjustment pin.
Internally connected to a pull-high resistor.
Hour Adjustment pin.
Internally connected to a pull-high resistor.
Minute Adjustment pin.
Internally connected to a pull-high resistor.
When low the Blank input pin will extinguish the display.
Internally connected to a pull-down resistor.
Crystal oscillator pin
IC test pin - should be left open or kept at a low level
64Hz signal output pin for oscillation frequency adjustment
Grid output pins for 1/2 duty VFD
Segment output pins for 1/2 duty VFD
2
Description
March 28, 2007
HT16566