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UM82C01 の電気的特性と機能

UM82C01のメーカーはUMCです、この部品の機能は「Capacitance Keyboard Encoder」です。


製品の詳細 ( Datasheet PDF )

部品番号 UM82C01
部品説明 Capacitance Keyboard Encoder
メーカ UMC
ロゴ UMC ロゴ 




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UM82C01 Datasheet, UM82C01 PDF,ピン配置, 機能
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





UM82C01 pdf, ピン配列
CDUMC
D.C. Characteristics
(Operating Voltage 5V 10%)
Item
Parameter
Input Low Voltage
Input High Voltage
Digital
Output Low Voltage, I/O Port
Output High Voltage, I/O Port
Output Low Voltage, Scan Line
Output High Voltage, Scan Line
Analog
Input High to Reference
Input Low to Reference
Operating Current
Stand by Power Supply Current
Symbol
VIL
VIH
VOLP
VCHP
VOLS
VOHS
AVH
AVL
Icc
I.S8
Min.
-0.5
2.0
Typ.
V c c - 0.45
V c c - 0.45
0.1
-0.1
Max.
0.8
Vcc
0.45
Vcc
0.45
Vcc
1.8
-1.8
15
200
Units
V
V
V
V
V
V
V
V
mA
,uA
UMB2COl
Conditions
IOL = 5 mA
IOH = -400,uA
IOL = 5 mA
IOH = -5 mA
Lying on Voltage
Reference VREF
No sensing and
Scanning
A. C. Characteristics
(TA = o°C to 70°C, Vcc = 5V ± 10%, Vss = OV)
Characteristics
Symbol
UM8048/UM82C01
4MHz
11 MHz
Units'
Min. Typ. Max. Min. Typ. Max.
Conditions
Address Latch Width
Cycle Time
Port Control Setup to PROG
Port Control Hold to PROG
Port Output Data Setup
Port Data Hold from PROG
PROG Strobe to ALE
PRbG Pulse Width
PROG to Port 2 Input Valid
Input Data Hold from PROG
A LE to SCAN Setup
ALE to SCAN Ended
tLL
tCY
tcp
tpc
toP
tpo
tCAI
tpp
tPR
tPF
tASl
tASz
700
3.75
420
800
1350
320
210
2370
150
1.36
100
160
400
90
50
700
2130
380
200
200
ns
,us
ns
ns
ns
ns
ns
ns
700 ns
140 ns
100 ns
100 ns
7-98


3Pages


UM82C01 電子部品, 半導体
UMB2COl
The Capacitive Switch
x
~[
4x -[
Figure 1. Mechanical Switch (a) Key off (b) Key on
x
~p
..
I
(a)
X
~-Z"N+CP [
+7-
Figure 2. Capacitive Switch (a) Keyoff (b) key on
Fig. 1 shows the traditional mechanical switch, (a) The
key switch is off, X-line and I-line are open to each other,
(b) The key switch is on, X-line and i-line short together.
Fig. 2, shows the capacitive switch, (a) The key switch is
off; only a small parasitic capacitance exists between
X-line and I-line, (b) The key switch is on, a Con + Cp
appears between X-line and I-line.
--1e--C
V 0 OI------4I!~-~11-1
0 /::,. V SENSE1
ISI Co
C
1
Cs C
/::,.V
SENSE1
=
Vo
.---=
-1 + -1
Vo
._--
Cs + C
Cs C
Figure 3a. Equivalent circuit for Capacitive Key
VOl
CA
ANTISCAN L</>0------j~
J Vo
0-----1
SCAN </>
Cp
/::"VSENSE2
I CS
Cp
/::"VSENSE2= Vo
Cs + Cp + CA
CA
Vo
Cs + Cp + CA
Figure 3b. Equivalent circuit for Capacitive Key with Antiscan Consideration
In Fig. 3a, an equivalent circuit for capacitive key is shown.
The voltage .1VSENSE1 is decided by the scanning voltage
Vo, capacitance C and Cs.
In Fig. 3b, an antiscanning consideration is presented.
Writing
The scanning trigger edge is taking place with the inverse
voltage "antiscan". After this edge, the voltage .1VSENSE2
is decided by the voltage devided by Cp minus the voltage
divided by CA.
PORT 2
OF UM8048
ALE ---------o~
PROG --------1~
CKE
~_ _ _ _ _ _ _ _ x~
16(11)
----------,
I
I
SCAN LINE
(11 Lines for UM82C01-2)
SENSE LINE
Figure 4. Logic Symbol of the CKE
7-101

6 Page



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共有リンク

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