HT6513
Mouse Controller
Pin Assignment
Features
·
Low power dissipation
·
Use 32.768KHz crystal
·
Crystal oscillator circuits on-chip
·
1200 baud rate serial output
·
Power directly from RS-232C without exter-
nal power supply
·
Three key-switches and four photo-couples
inputs
·
Key-in and key-release debounce interval 52 ms
·
The HT6513 can execute two different
outputs with any of the key-switch inputs
·
RXD with heavy NMOS output
General Description
The HT6513 is a specially designed CMOS IC
for mouse control applications. Capable of driv-
ing up to 3 key-switches and 4 photo-couplers
directly into a standard RS-232C line, and it
can be operated without an external power sup-
ply. It is compatible with both Microsoft and
Mouse systems with false entries being pre-
vented by internal debounce circuits.
1
23rd Oct '96
Block Diagram
Pin Description
Pin Name
I/O
Internal
connection
Description
MS
I
--
When this pin is connected to VDD, then HT6513 is assigned
to operate under the microsoft mode only. If the pin is
connected to VSS, then HT6513 will operate under the mouse
system mode. If MS pin is "floating", the HT6513 is on the
power on initiation mode.
TEST
I
Pull-Low
For IC test only. The test pin must be connected to VSS, while
the chip is under normal usage.
OSCI
I
--
Oscillator input pin
OSCO
O
--
Oscillator output pin
RTS
I
--
The signal is sent by the mouse driver from the computer to
select the mode.
The HT6513 replies with the selected mode to the RXD line
after the pulse signal of the RTS line. RXD will send out "CD"H
code under the microsoft mode.
RXD
O
NMOS
Open Drain
There are 7 or 8 bits in each data byte. Using parallel-in and
serial-out circuit, the data bytes are shifted out from bit 0
through the most significant bit. HT6513 will transmit the
data when the status of the three key-switches or the state of
the horizontal counter or vertical counter change.
VSS
I
--
Negative power supply
HT6513
2
23rd Oct '96
Pin Name
I/O
Internal
connection
Description
R
M
L
I
Pull-Low
Three key-switches have seven different combinations in total.
Both key-pressed and key-released signals will be sent
accompanied with horizontal and vertical state. The status of
the key-switches, the values of horizontal or vertical counters
will be present at RXD and RXD. The debounce interval for
both key-press and key-release is 13ms.
X1
X2
Y1
Y2
I
--
Four photo-couplers signals denote UP, DOWN, LEFT, and
RIGHT state.
During the scaning period, as long as the photo-couplers
change their states, the value of vertical or horizontal counter
will increase or decrease accordingly.
VDD
I
--
Position power supply
Approximate Internal connection circuits
HT6513
3
23rd Oct '96
X1/X2/Y1/Y2 Input pin I/V curve (optomechanical mouse)
Absolute Maximum Ratings
Supply Voltage ................................. 0.3V to 7V
Storage Temperature................. 50
°
C to 125
°
C
Input Voltage.................... V
SS
0.3V to V
DD
+0.3
Operating Temperature............... 20
°
C to 75
°
C
D.C. Characteristics
(Ta=25°C)
Symbol
Parameter
Test condition
Min.
Typ.
Max.
Unit
V
DD
Condition
V
DD
Operating voltage
--
--
4.0
5.1
6.1
V
I
DD
Operating current
5.6V
No load
--
400
760
µ
A
V
IL
X1,X2,Y1,Y2 Input low voltage
5.6V
--
0
--
1.1
V
V
IH
X1,X2,Y1,Y2
Input high voltage
5.6V
--
1.8
--
5.6
V
V
IL1
Input low voltage, other pin
5.6V
--
0
--
1
V
V
IH1
Input high voltage, other pin
5.6V
--
3.5
--
5.6
V
I
OL
RXD output sink current
5.6V
V
OL
=0.56V
3.5
6
--
mA
V
OH
RXD high-level output voltage
--
--
--
--
16
V
R
PL
Pull-low resistance
5.6V
L, M, R
key-switches
65
--
200
K
HT6513
4
23rd Oct '96
A.C. Characteristics
(Ta=25°C)
Symbol
Parameter
Test Condition
Min.
Typ.
Max.
Unit
V
DD
Condition
f
SYS
System Clock
5.6V Crystal Oscillator
30.8
32.768
34.2
KHz
f
P
Photo-Couple input
frequency
5.6V
--
--
--
8.2
KHz
f
N
Photo-Couple operation
frequency
5.6V
--
0
--
8
KHz
t
KD
Key debounce
5.6V
--
--
52
--
ms
t
MS
Transmission time
5.6V
mouse system
(1200 bps)
--
41.3
--
ms
t
MI
Transmission time
5.6V microsoft (1200 bps)
--
24.8
--
ms
t
S
Start bit time
5.6V (1200 bps)
--
0.85
--
ms
t
D
Data bit time
5.6V (1200 bps)
--
0.82
--
ms
t
P
Stop bit time
5.6V (1200 bps)
--
0.82
--
ms
t
RD
Mode code delay
Time (f
SYS
=32.768KHz)
5.6V (1200 bps)
11.9
--
14
ms
t
R
Rising edge
crossed width
5.6V
--
31
--
--
µ
s
t
F
Falling edge
crossed width
5.6V
--
31
--
--
µ
s
HT6513
5
23rd Oct '96
PDF 
ZIP