HT1632 (Holtek), display drivers
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HT1632
32
8&24
16 LED Driver
Features
Serial MCU interface
CS,RD,WR, DATA
32 out bits/8 commons and
24 out bits/16 commons
Data mode & command mode instruction
Cascading function for extended applications
(up to 5 HT1632s possible)
Integrated display RAM
select 32 out bits &
8 commons for 64
4 display RAM, or select 24
outbits & 16 commons for 96
4 display RAM
Selectable NMOS open drain output driver and
PMOS open drain output driver for commons
16-level PWM brightness control
52-pin QFP package
Integrated 256kHz RC oscillator
Applications
Other consumer application
Digital clock, thermometer, counter, voltmeter
LED Displays
Instrumentation readouts
General Description
The HT1632 is a memory mapping LED display control-
ler/driver, which can select a number of out bits and com-
mons. These are 32 out bits & 8 commons and 24 out bits
& 16 commons. The device supports 16-gradation LEDs
for each out line using PWM control with software instruc-
tions. A serial interface is conveniently provided for the
command mode and data mode. Only three or four lines
are required for the interface between the host controller
and the HT1632. The display can be extended by cas-
cading the HT1632 for wider applications.
Block Diagram
Rev. 1.00
1
October 2, 2007
Operating voltage: 2.4V~5.5V
Multiple LED display
Industrial control indicator
HT1632
Pin Assignment
Pin Description
Pad Name
I/O
Description
OUTBIT0~OUTBIT23
O
Line drivers. These pins drive the LEDs.
OUTBIT24/COM15~
OUTBIT31/COM8
O
Drive LED output or Common output
COM0~COM7
O
Common outputs
SYNC
I/O
Cascade synchronization input and output
OSC
I/O
If the system clock is is sourced from an external clock source, the external clock
source should be connected to this pad. If the on-chip RC oscillator is selected,
this pad can be connected to a high or low level. If the cascade mode is selected,
this pad is the driver clock signal.
DATA
I/O
Serial data input or output with pull-high resistor
WR
I
WRITE clock input with pull-high resis
tor
Data on the DATA lines are latched into
the HT1632 on the rising edge of the WR signal.
RD
I
READ clock input with
pull
-high resistor. The HT1632 RAM data is clocked out on
the falling edge of the RD signal. The clocked out data will appear on the DATA
line. The host controller can use the next rising edge to latch the clocked out data.
CS
I
Chip select input with pull-high resistor When the CS line is high, the data and
command read from
or w
ritten to the HT1632 is disabled, and the serial interface
circuit is also reset. If CS is low, the data and command transmission between the
host controller and the HT1632 are all enabled.
LED_VSS
Negative power supply for driver circuit, ground.
VSS
Negative power supply for logic circuit, ground.
VDD
Positive power supply for logic and driver circuit.
Rev. 1.00
2
October 2, 2007
HT1632
Absolute Maximum Ratings
Supply Voltage ...........................V
SS
0.3V to V
SS
+5.5V
Storage Temperature ............................
50
Cto125
C
Input Voltage.............................V
SS
0.3V to V
DD
+0.3V
Operating Temperature...........................
40
Cto85
C
Note: These are stress ratings only. Stresses exceeding the range specified under
Absolute Maximum Ratings
may
cause substantial damage to the device. Functional operation of this device at other conditions beyond those listed
in the specification is not implied and prolonged exposure to extreme conditions may affect device reliability.
D.C. Characteristics
Ta=25
C
Test Conditions
Symbol
Parameter
Min.
Typ.
Max.
Unit
V
DD
Conditions
V
DD
Operating Voltage
2.4
5
5.5
V
I
DD
Operating Current
5V
No load, LED ON,
on-chip RC oscillator
10
mA
I
STB
Standby Current
5V No load, power down mode
10
A
V
IL
Input Low Voltage
5V DATA, WR,CS,RD
0
1
V
V
IH
Input High Voltage
5V DATA, WR,CS,RD
4
5
V
I
OL1
DATA
5V V
OL
=0.5V
1.3
2.6
mA
I
OH1
DATA
5V V
OH
=4.5V
0.9
1.8
mA
I
OL2
OSC, SYNC
5V V
OL
=0.5V
2.6
5.2
mA
I
OH2
OSC, SYNC
5V V
OH
=4.5V
1.8
3.6
mA
I
OL3
Common Sink Current
5V V
OL
=0.5V
50
mA
I
OH3
Common Source Current
5V V
OH
=4.5V
20
mA
I
OL4
LED Out Driver
5V V
OL
=0.5V
50
mA
R
PH
Pull-high Resistor
5V DATA, WR,CS,RD
10
30
60
k
Rev. 1.00
3
October 2, 2007
HT1632
A.C. Characteristics
Ta=25
C
Test Conditions
Symbol
Parameter
Min.
Typ.
Max.
Unit
V
DD
Conditions
f
SYS
System Clock
5V On-chip RC oscillator
256
kHz
LED Duty Cycle & Frame
Frequency
5V 1/8 duty
97.5
Hz
f
LED
5V 1/16 duty
97.5
Hz
f
CLK1
Serial Data Clock (WR pin)
5V Duty cycle 50%
4
300
kHz
f
CLK2
Serial Data Clock (RD pin)
5V Duty cycle 50%
150
kHz
t
CS
Serial Interface Reset Pulse
Width
CS
250
ns
Write mode
1.67
s
t
CLK
WR,RDInput Pulse Width
5V
Read mode
3.34
t
r
,t
f
Rise/Fall Time Serial Data
Clock Width (Figure 1)
120
ns
t
su
Set
up Time for DATA to WR,
RD Clock Width (Figure 2)
120
ns
t
h
Hold Time for DATA to WR,RD,
Clock Width (Figure 2)
120
ns
t
su1
Setup Time for CS to WR,RD,
Clock Width (Figure 3)
100
ns
t
h1
Hold Time for CS to WR,RD,
Clock Width (Figure 3)
100
ns
Figure 1
Figure 2
Figure 3
Rev. 1.00
4
October 2, 2007
HT1632
Functional Description
Display Memory
RAM
The static display memory, RAM, is organised into 64
4
96
4 bits. The contents of the RAM are directly mapped
to the contents of the LED driver. Data in the RAM can
be accessed by the READ, WRITE, and READ-
MODIFY-WRITE commands. The following table shows
the mapping from the RAM to the LED pattern:
4 bits and stores the displayed data. If 32 out
bits & 8 commons is selected, the RAM size is 64
4 bits.
If 24 out bits & 16 commons is selected the RAM size is
Com7
Com6
Com5
Com4
Addr.
Com3
Com2
Com1
Com0
Addr.
Out0
01H
00H
Out1
03H
02H
Out2
05H
04H
Out3
07H
06H
Out4
09H
08H
Out5
0BH
0AH
Out6
0DH
0CH
Out7
0FH
0EH
Out8
11H
10H
Out9
13H
12H
Out10
15H
14H
Out11
17H
16H
Out12
19H
18H
Out13
1BH
1AH
Out14
1DH
1CH
Out15
1FH
1EH
Out16
21H
20H
Out17
23H
22H
Out18
25H
24H
Out19
27H
26H
Out20
29H
28H
Out21
2BH
2AH
Out22
2DH
2CH
Out23
2FH
2EH
Out24
31H
30H
Out25
33H
32H
Out26
35H
34H
Out27
37H
36H
Out28
39H
38H
Out29
3BH
3AH
Out30
3DH
3CH
Out31
3FH
3EH
D3
D2
D1
D0
Data
D3
D2
D1
D0
Data
32 Outbits & 8 Common for 64
4 Display RAM
Rev. 1.00
5
October 2, 2007
bits or 96
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HT1632
32
8&24
16 LED Driver
Features
Serial MCU interface
CS,RD,WR, DATA
32 out bits/8 commons and
24 out bits/16 commons
Data mode & command mode instruction
Cascading function for extended applications
(up to 5 HT1632s possible)
Integrated display RAM
select 32 out bits &
8 commons for 64
4 display RAM, or select 24
outbits & 16 commons for 96
4 display RAM
Selectable NMOS open drain output driver and
PMOS open drain output driver for commons
16-level PWM brightness control
52-pin QFP package
Integrated 256kHz RC oscillator
Applications
Other consumer application
Digital clock, thermometer, counter, voltmeter
LED Displays
Instrumentation readouts
General Description
The HT1632 is a memory mapping LED display control-
ler/driver, which can select a number of out bits and com-
mons. These are 32 out bits & 8 commons and 24 out bits
& 16 commons. The device supports 16-gradation LEDs
for each out line using PWM control with software instruc-
tions. A serial interface is conveniently provided for the
command mode and data mode. Only three or four lines
are required for the interface between the host controller
and the HT1632. The display can be extended by cas-
cading the HT1632 for wider applications.
Block Diagram
Rev. 1.00
1
October 2, 2007
Operating voltage: 2.4V~5.5V
Multiple LED display
Industrial control indicator
HT1632
Pin Assignment
Pin Description
Pad Name
I/O
Description
OUTBIT0~OUTBIT23
O
Line drivers. These pins drive the LEDs.
OUTBIT24/COM15~
OUTBIT31/COM8
O
Drive LED output or Common output
COM0~COM7
O
Common outputs
SYNC
I/O
Cascade synchronization input and output
OSC
I/O
If the system clock is is sourced from an external clock source, the external clock
source should be connected to this pad. If the on-chip RC oscillator is selected,
this pad can be connected to a high or low level. If the cascade mode is selected,
this pad is the driver clock signal.
DATA
I/O
Serial data input or output with pull-high resistor
WR
I
WRITE clock input with pull-high resis
tor
Data on the DATA lines are latched into
the HT1632 on the rising edge of the WR signal.
RD
I
READ clock input with
pull
-high resistor. The HT1632 RAM data is clocked out on
the falling edge of the RD signal. The clocked out data will appear on the DATA
line. The host controller can use the next rising edge to latch the clocked out data.
CS
I
Chip select input with pull-high resistor When the CS line is high, the data and
command read from
or w
ritten to the HT1632 is disabled, and the serial interface
circuit is also reset. If CS is low, the data and command transmission between the
host controller and the HT1632 are all enabled.
LED_VSS
Negative power supply for driver circuit, ground.
VSS
Negative power supply for logic circuit, ground.
VDD
Positive power supply for logic and driver circuit.
Rev. 1.00
2
October 2, 2007
HT1632
Absolute Maximum Ratings
Supply Voltage ...........................V
SS
0.3V to V
SS
+5.5V
Storage Temperature ............................
50
Cto125
C
Input Voltage.............................V
SS
0.3V to V
DD
+0.3V
Operating Temperature...........................
40
Cto85
C
Note: These are stress ratings only. Stresses exceeding the range specified under
Absolute Maximum Ratings
may
cause substantial damage to the device. Functional operation of this device at other conditions beyond those listed
in the specification is not implied and prolonged exposure to extreme conditions may affect device reliability.
D.C. Characteristics
Ta=25
C
Test Conditions
Symbol
Parameter
Min.
Typ.
Max.
Unit
V
DD
Conditions
V
DD
Operating Voltage
2.4
5
5.5
V
I
DD
Operating Current
5V
No load, LED ON,
on-chip RC oscillator
10
mA
I
STB
Standby Current
5V No load, power down mode
10
A
V
IL
Input Low Voltage
5V DATA, WR,CS,RD
0
1
V
V
IH
Input High Voltage
5V DATA, WR,CS,RD
4
5
V
I
OL1
DATA
5V V
OL
=0.5V
1.3
2.6
mA
I
OH1
DATA
5V V
OH
=4.5V
0.9
1.8
mA
I
OL2
OSC, SYNC
5V V
OL
=0.5V
2.6
5.2
mA
I
OH2
OSC, SYNC
5V V
OH
=4.5V
1.8
3.6
mA
I
OL3
Common Sink Current
5V V
OL
=0.5V
50
mA
I
OH3
Common Source Current
5V V
OH
=4.5V
20
mA
I
OL4
LED Out Driver
5V V
OL
=0.5V
50
mA
R
PH
Pull-high Resistor
5V DATA, WR,CS,RD
10
30
60
k
Rev. 1.00
3
October 2, 2007
HT1632
A.C. Characteristics
Ta=25
C
Test Conditions
Symbol
Parameter
Min.
Typ.
Max.
Unit
V
DD
Conditions
f
SYS
System Clock
5V On-chip RC oscillator
256
kHz
LED Duty Cycle & Frame
Frequency
5V 1/8 duty
97.5
Hz
f
LED
5V 1/16 duty
97.5
Hz
f
CLK1
Serial Data Clock (WR pin)
5V Duty cycle 50%
4
300
kHz
f
CLK2
Serial Data Clock (RD pin)
5V Duty cycle 50%
150
kHz
t
CS
Serial Interface Reset Pulse
Width
CS
250
ns
Write mode
1.67
s
t
CLK
WR,RDInput Pulse Width
5V
Read mode
3.34
t
r
,t
f
Rise/Fall Time Serial Data
Clock Width (Figure 1)
120
ns
t
su
Set
up Time for DATA to WR,
RD Clock Width (Figure 2)
120
ns
t
h
Hold Time for DATA to WR,RD,
Clock Width (Figure 2)
120
ns
t
su1
Setup Time for CS to WR,RD,
Clock Width (Figure 3)
100
ns
t
h1
Hold Time for CS to WR,RD,
Clock Width (Figure 3)
100
ns
Figure 1
Figure 2
Figure 3
Rev. 1.00
4
October 2, 2007
HT1632
Functional Description
Display Memory
RAM
The static display memory, RAM, is organised into 64
4
96
4 bits. The contents of the RAM are directly mapped
to the contents of the LED driver. Data in the RAM can
be accessed by the READ, WRITE, and READ-
MODIFY-WRITE commands. The following table shows
the mapping from the RAM to the LED pattern:
4 bits and stores the displayed data. If 32 out
bits & 8 commons is selected, the RAM size is 64
4 bits.
If 24 out bits & 16 commons is selected the RAM size is
Com7
Com6
Com5
Com4
Addr.
Com3
Com2
Com1
Com0
Addr.
Out0
01H
00H
Out1
03H
02H
Out2
05H
04H
Out3
07H
06H
Out4
09H
08H
Out5
0BH
0AH
Out6
0DH
0CH
Out7
0FH
0EH
Out8
11H
10H
Out9
13H
12H
Out10
15H
14H
Out11
17H
16H
Out12
19H
18H
Out13
1BH
1AH
Out14
1DH
1CH
Out15
1FH
1EH
Out16
21H
20H
Out17
23H
22H
Out18
25H
24H
Out19
27H
26H
Out20
29H
28H
Out21
2BH
2AH
Out22
2DH
2CH
Out23
2FH
2EH
Out24
31H
30H
Out25
33H
32H
Out26
35H
34H
Out27
37H
36H
Out28
39H
38H
Out29
3BH
3AH
Out30
3DH
3CH
Out31
3FH
3EH
D3
D2
D1
D0
Data
D3
D2
D1
D0
Data
32 Outbits & 8 Common for 64
4 Display RAM
Rev. 1.00
5
October 2, 2007
bits or 96
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