HT16515(2003) Ver la hoja de datos (PDF) - Holtek Semiconductor
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Fabricante
HT16515 Datasheet PDF : 12 Pages
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HT16515
A.C. Characteristics
Symbol
Parameter
tPHL
Logic Supply Voltage
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
5V CLK®DO
5V CL=15pF, RL=10kW
Min.
¾
¾
5V CL=300pF, S1~S16
¾
5V
CL=300pF, G1~G4
S17/G12~S24/G5
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 300 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 stores the data transmitted from
an external device to the HT16515 through a serial inter-
face. 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 commands. It is assigned as 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 S E G 24
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
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
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
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
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
02H U
05H U
08H U
0B H U
0E H U
11H U
14H U
17H U
1A H U
1D H U
20H U
23H U
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
b0
b3b4
b7
XXHL XXHU
L o w e r H ig h e r
4 b its 4 b its
Dimming Control
HT16515 provides an 8-step dimmer function on display
by controlling the 3-bit binary command code. The full
pulse width of grid signal is divided into 16 uniform sec-
tions by PWM (pulse width modulation) technology.
The 16 uniform sections available form an 8-step dim-
mer 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 (Seg1/K1~Seg16/K16) output of
the HT16515. The key strobe signal outputs are
time-multiplexed signals from Seg1/K1~Seg16/K16.
The states of inputs K0 and K1 are sampled by strobe
signal Seg1/K1~Seg16/K16 and latched into the regis-
ter.
Rev. 1.00
5
December 19, 2003
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