HT16512 Holtek Semiconductor Inc, HT16512 Datasheet - Page 3

• Manufacturer Part Number: HT16512
• Description: 1/4 to 1/11 Duty VFD Controller
• Manufacturer: Holtek Semiconductor Inc

Pin Description
1~4
5
6
7, 43
8
9
10~13
14, 38
15~20
21~25
26, 28~31
27
37~32
42~39
44
Pin No.
SW0~SW3
DO
DI
VSS
CLK
CS
K0~K3
VDD
S0/K0~S5/K5
S6~S10
S11/G10~S15/G6
VEE
G0~G5
LED0~LED3
OSC
Pin Name
I/O
¾
¾
¾
O
O
O
O
O
O
I
I
I
I
I
I
4-bit general purpose input port
Output serial data at the falling edge of the shift clock,
starting from low order bit. This is an NMOS open-drain
output pin.
Input serial data at the rising edge of the shift clock, start-
ing from the low order bit.
Power supply, ground
Reads serial data at the rising edge, and outputs data at the
falling edge.
Initializes serial interface at the rising or falling edge of the
HT16512. Then it waits to receive a command. Data input
after CS has fallen is processed as a command. While com-
mand data is processed, current processing is stopped, and
the serial interface is initialized. While CS is high, CLK is
ignored.
Keying data input to these pins is latched at the end of the
display cycle.
Posistive power supply
Segment or key source output pins (dual function). This is
PMOS open-drain and pull-low resistor output.
Segment driver output pins (segment only). This is PMOS
open-drain and pull-low resistor output.
Segment or Grid driver output pins. These pins are
selectable for segment or grid driving. This is PMOS
open-drain and pull-low resistor output.
VFD power supply
Grid driver output pins (Grid only). This is PMOS
open-drain and pull-low resistor output.
LED driver output ports. This is a CMOS output pin.
Connected to an external resistor or an RC oscillator cir-
cuit.
3
Description
December 24, 1999
HT16512