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PDF UM82C01 Data sheet ( Hoja de datos )
| Número de pieza | UM82C01 | |
| Descripción | Capacitance Keyboard Encoder | |
| Fabricantes | UMC | |
| Logotipo |  |
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eUMC
UM82COl
: : : : : : : Capacitance Keyboard Encoder (CKE)
Features
• 16x8 matrix, can build up to 128 key capacitance
keyboard
• Single chip with 16 scan drive outputs and 8 sense
inputs
• Two types of package. 28 pin for 88 key KB and 40
pin for 128 key KB
• Keyboard scanning and encoding under complete
control of the user's computer, especially UM8048
microcomputer
• Single 5V supply
• High-speed CMOS technology
• Serve as easy interface to UM8048
• New CMOS sense technology, CMOS analog sense
circuit is built in
• Byte wide sense, higher performance than serial sense
technology
• Wide UM8048 frequency range, 1M to 11 MHz UM8048
can be used
General Description
UM82C01 is a CMOS LSI, which offers interface between
microcomputer and capacitive keyboard matrix. 40 pin
UM82C01-1 is capable of scanning up to 128 lowcost
capacitive keys. 28 pin UM82C01-2 serve keyboard
applications with less than 88 keys.
The keyboard scan is under complete control of the
UM8048 series microcomputer writing to expand I/O port,
port 2 data is multiplexed to initiate one of the scan
lines. Sense circuit will receive the scan signal through
capacitive keys if one key is pressed. Sense circuit includes
CMOS analog and digital circuit, which sense action by
following amplifing and latching of analog signal from
capacitive switch. These 8 bits data are then divided
and latched marcing two nibbles. Two instructions can
read these two nibbles from port 2. Then the micro-
computer can analyze them and generate the scan
code.
Antiscan is used to enhance the simple capacitive switches
that· are usually used in capacitive keyboard, offering
switching threshold in sense input. This provides the
keyboard with mechanical hysteresis which builts in the
more expensive hall-effect and reed switches.
Pin Configuration
ALE
N.C.
P20
P21
P22
-1'23
N.C.
N.C.
N.C.
vcc
N.C.
10
11
12
13
14
15
16
17
vss
PROG
N.C.
XO
Xl
X2
X3
X4
X5
X6
X7
X8
X9
Xl0
Xll
X12
X13
X14
X15
Xz
N.C.
11
12
13
14
15
16
17
Vss
XZ
X10
X9
X8
X7
X6
10
Vee
P23
P22
P21
P20
ALE
PROG
XO
X1
X2
X3
X4
X5
7-96
1 page  
UM82COl
Pin Description (Continued)
Pin Names
I/O
Functions
ALE
Address Latch
Enable Strobe
I UM82COl begins Zeroing stage of its sense amplifier at this instant. PROG will
go to high before second ALE of this write instruction. The Zeroing stage ends
at the next ALE low to high transient. If you see Timing Diagram on P. 11,
you will find that this edge triggers the selected scan line to be active. The
second ALE, which is next to end write instruction, is used to control scan I~ne
to inactive and its active transient is the high to low edge. In read cycle, when
first ALE goes from high to low, PROG is activated to go to low, port 2
containing port address and read instruction code is valid and should be latched
by UM82COl to initiate the read mode.
PROG
Control Strobe
I An active low strobe comes direct from UM8048 PROG. In the view point of
UM8048, PROG is a control strobe to expanded I/O. UM82COl is designed to
locate expanded port 4 and port 5 in UM8048.
Every time PROG is activated, UM82COl is initiated to enter write or read
mode. When PROG goes inactive in a write cycle, selected scan data is valid in
port 2 and is latched by UM82COl to encode the scan line. In a read cycle,
latched upper nibble and lower nibble are valid circularly in port 2 at every
PROG low to high transition.
XO-X15 Scan Line Out
0 These are the 16 full range drive outputs. One of the lines is activated in a
write cycle. Selected scan data is latched and used to decode these sixteen
scan lines so the scanning is fully programmable by UM8048. The selected
scan line is activated in the defined ALE rising edge and ended in the next
ALE falling edge. (Reference to Timing Diagram on P. 11) The defined ALE
is the first ALE after the write instruction is finished. There are eleven scan
.lines for 28 pin UM82COl-2 Xll to X15 and are included in scan line driver
for 40 pin UM82C01-l.
Xz Antiscan Out
0 Th is is the antiscan output. This output is activated whenever no scann ing
occurs, and is deactivated when anyone of XO to X15 is activated. Antiscan
is used to reduce the Voltage. in sense input when there is no scanning that
prevents logic error.
10-17
Sense Line Input
I These eight lines are inputs from capacitance keyboard matrix. The small
current pu Ises caused by the scan lines and pressed keyswitches are detected
here.
Vee Power Supply
I Connected to +5V power supply.
Vss Ground
I Normally connected to +OV ground.
Application Description
The Microprocessor
The capacitance keyboard encoder (CKE) UM82COl is
designed to serve as an interface to UM8048 series 8-bit
microprocessor. The user can control the keyboard
function easily through programming of microprocessor,
which includes scanning reading and serve as an interface
to host computer.
The Key boa rd
A keyboard is an array of switches. The array consists of
two dimensional matrix. One side of the matrix (X-lines) is
used to drive the array with a microprocessor chosen
signal, while the other side (Hines) is connected to sense
circuits. In traditional configuration, users make use of
mechanical contact switches. With a new sensing
mechanism, capacitive switches present a good solution.
7-100
5 Page 
Q1JUMC
UM82COl
Table 2. Definition of Cs ' CA and CBS
Name
Symbol
Min.
Typ.
Max.
Unit
Shunt Capacitance
Antiscan Capacitance
Capacitance between two sense
Cs
CA
CBS
80 150
pf
4 8 pf
5 pf
Table 3. Recommended Application of CA for various CON
Symbol
Range
Lower
Upper
Unit
CON
CA
Cp
10 25
48
03
pf
pf
pf
(a)
Symbol
CON
CA
Cp
Range
Lower
Upper
25 35
8 15
03
(b)
Unit
pf
pf
pf
Typical Application
rk
T
1
JI
P20
P23
UM8048
ALE
PROG
U
TO KEYBOARD
INTERFACE
I-<iP20 X:E
P23 xo 1-<I:'
ALE
PROG
CKE
iX15
UM82C01
..10 1-l"-'-.cs-~
.J.()
This means shield by ground
17 lcs ~
l>--{(
CON
16x8MATRIX
~ON
~( ~cA
CON
~( ~c~
CON
Ordering Information
Part Number
UM82C01-1
UM82COl-2
Package
40 DIP
28 DIP
7-106
11 Page | ||
| Páginas | Total 11 Páginas | |
| PDF Descargar | [ Datasheet UM82C01.PDF ] | |
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