HT16511 Просмотр технического описания (PDF) - Holtek Semiconductor

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HT16511

1/8 to 1/16 Duty VFD Controller

Holtek Semiconductor 

HT16511

A.C. Characteristics

Symbol

Parameter

tPHL

Propagation Delay Time

tPLH

tr1

Rise Time

tr2

tf

Fall Time

tmax

Maximum Clock Frequency

Ci

Input Capacitance

tCW

Clock Pulse Width

tSW

Strobe Pulse Width

tSU

Data Setup Time

th

Data Hold Time

tCS

Clock-Strobe Time

tW

Wait Time

Test Conditions

VDD

Conditions

Min.

5V CLK®DO

¾

5V CL=15pF, RL=10kW

¾

5V CL=300pF, S0~S12

¾

5V CL=300pF, G1~G16

¾

5V CL=300pF, Sn, Gn

¾

5V Duty=50%

1

5V

¾

¾

5V

¾

400

5V

¾

1

5V

¾

100

5V

¾

100

5V CLK rising edge to CS rising edge 1

5V CLK rising edge to CLK falling edge 1

Ta=25°C

Typ. Max. Unit

¾ 300 ns

¾ 100 ns

¾

2

ms

¾ 0.5 ms

¾ 120 ms

¾ ¾ MHz

¾ 15 pF

¾ ¾ ns

¾ ¾ us

¾ ¾ ns

¾ ¾ ns

¾ ¾ ms

¾ ¾ ms

Functional Description

Display RAM and Display Mode

The static display RAM is organized into 40´8 bits and

stores the data transmitted from an external device to

the HT16511 through a serial interface. The contents of

the RAM are directly mapped to the contents of the VFD

driver. Data in the RAM can be accessed through the

data setting, address setting and display control com-

mands. It is assigned addresses in 8-bit unit as follows:

S E G 1 S E G 4 S E G 8 S E G 12 S E G 16 S E G 20

00H L

03H L

06H L

09H L

0C H L

0FH L

12H L

15H L

18H L

1B H L

1E H L

21H L

24H L

27H L

2A H L

2D H L

00H U

03H U

06H U

09H U

0C H U

0FH U

12H U

15H U

18H U

1B H U

1E H U

21H U

24H U

27H U

2A H U

2D H U

01H L

04H L

07H L

0A H L

0D H L

10H L

13H L

16H L

19H L

1C H L

1FH L

22H L

25H L

28H L

2B H L

2E H L

01H U

04H U

07H U

0A H U

0D H U

10H U

13H U

16H U

19H U

1C H U

1FH U

22H U

25H U

28H U

2B H U

2E H U

02H L

05H L

08H L

0B H L

0E H L

11H L

14H L

17H L

1A H L

1D H L

20H L

23H L

26H L

29H L

2C H L

2FH L

D IG 1

D IG 2

D IG 3

D IG 4

D IG 5

D IG 6

D IG 7

D IG 8

D IG 9

D IG 1 0

D IG 1 1

D IG 1 2

D IG 1 3

D IG 1 4

D IG 1 5

D IG 1 6

b0

b3b4

b7

XXHL XXHU

L o w e r H ig h e r

4 b its 4 b its

Note:

Only the lower 4 bits of the addresses assigned

to SEG17 through SEG20 are valid, the higher

4 bits are ignored.

Dimming Control

HT16511 provides 8-step dimmer function on display by

controlling the 3-bit binary command code. The full

pulse width of grid signal is divides into 16 uniform sec-

tions by PWM (pulse width modulation) technology.

The 16 uniform sections available form 8 steps dimmer

via 3-bit binary code. The 8-step dimmer includes 1/16,

2/16, 4/16, 10/16, 11/16, 12/16, 13/16 and 14/16. The

1/16 pulse width indicates minimum lightness. The

14/16 pulse width represents maximum lightness (Refer

to the display control command).

Key Matrix and Key-Input Data Storage RAM

The key matrix scans the series key states at each level

of the key strobe signal (S1/K1~S12/K12) output of the

HT16511. The key strobe signal outputs are

time-multiplexed signals from S1/K1~S12/K12. The

states of inputs K0~K3 are sampled by strobe signal

S1/K1~S12/K12 and latched into the register.

Rev. 1.10

5

September 18, 2003

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