Holtek HT82K628A User manual

HT82K628A
Windows 2000 Keyboard Encoder
Pin Assignment
Rev. 1.30 1 October 3, 2002
Features
·Design for Windows 95/98/2000/NT
·Supports WindowsTM keys
·Supports PC/AT and PS/2 code set 1, 2, 3
·Supports Japanese , Korean , Brazilian and
European
·RC oscillator
·Phantom key detection
·Low power consumption
·101/102/104/105/107/109 keys or other special ap-
plication keyboard encoder
·8 external hot keys
·Supports Mini-keyboard and Internet/Multimedia
keyboard
·WINDOWS is a registered trademark of Microsoft
corporation
·40-pin DIP package
General Description
The HT82K628A is a keyboard encoder designed for
IBM PC/AT, IBM PS/2 and all compatible machines.
The HT82K628A accepts keyboard inputs and provides
a 16-character first-in-first-out buffer in which data is
stored.
An inexpensive RC oscillator can be used for the system
clock. Simple implementation of this device is an advan-
tage for high performance and low cost keyboard appli-
cations.
4 0
3 9
3 8
3 7
3 6
3 5
3 4
3 3
3 2
3 1
3 0
2 9
2 8
2 7
2 6
2 5
2 4
2 3
2 2
2 1
1
2
3
4
5
6
7
8
9
1 0
1 1
1 2
1 3
1 4
1 5
1 6
1 7
1 8
1 9
2 0
R 5
R 4
C 3
C 2
C 1
C 0
R 3
R 2
R 1
R 0
R 1 9
R 1 8
R 1 7
R 1 6
V S S
S C R O L L
NUM
D A T A
C L O C K
F n S e l e c t
R 6
R 7
C 4
C 5
C 6
C 7
N C
O S C 1
V D D
R E S E T
C A S
R 8
R 9
R 1 0
R 1 1
R 1 2
R 1 3
R 1 4
R 1 5
M a c r o K e y s e l e c t
H T 8 2 K 6 2 8 A
4 0 D I P - A

Pin Description
Pin No. Pin Name I/O Description
10~7, 2~1,
40~39, 29~22,
14~11
R0~R19 O Keyboard matrix scanning output pins
6~3, 38~35 C0~C7 I Keyboard matrix scanning input pins
15 VSS ¾Negative power supply, ground
16 SCROLL O Scroll Lock indicator
17 NUM O Num Lock indicator
18 DATA I/O Bidirectional data transmission line
19 CLOCK I/O Synchronous clock signal. Used to clock the transmission data.
20 Fn Select I Mini-keyboard select, enables the function if connected to VSS.
21 Macro Key Select I Macro Key select, disables the function if connected to VSS.
30 CAPS O Caps Lock indicator
31 RESET IChip reset input. Active low. Built-in power-on reset circuit to reset the en-
tire chip. Chip can also be externally reset via RESET pin.
32 VDD ¾5.0V positive power supply
33 OSC1 I System clock input; 58.3kWresistor connected for RC OSC
34 NC ¾No connection
Absolute Maximum Ratings
Supply Voltage ..........................VSS-0.3V to VSS+5.5V Storage Temperature ...........................-50°Cto125°C
Input Voltage .............................VSS-0.3V to VDD+0.3V Operating Temperature ..........................-25°Cto70°C
Note: These are stress ratings only. Stresses exceeding the range specified under ²Absolute Maximum Ratings²may
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 reliabil-
ity.
Electrical Characteristics Ta=25°C
Symbol Parameter Test Conditions Min. Typ. Max. Unit
VDD Conditions
VDD Operating Voltage ¾¾ 3 5 5.25 V
IDD Operating Current (RC OSC) 5V No load, fSYS= 4MHz ¾2.5 5 mA
VIL Input Low Voltage 5V ¾0¾1.5 V
VIH Input High Voltage 5V ¾3.5 ¾5V
IOL Sink Current 5V VOL= 0.5V 712
¾mA
IOH Source Current 5V VOH= 4.5V -2.5 -4.5 ¾mA
ILED LED Sink Current (Scroll, Num, Caps) 5V VOL=3.2V 10 14 18 mA
Rph Internal Pull-high Resistance (C0~C7, R0~R19) 5V ¾51220
kW
Rph1 Internal Pull-high Resistance (DATA, CLOCK) 5V ¾2 4.7 8 kW
Rph2 Internal Pull-high Resistance (RESET)5V ¾25 50 75 kW
fSYS System Clock (RC OSC) 5V ¾¾
4¾MHz
HT82K628A
Rev. 1.30 2 October 3, 2002

HT82K628A
Rev. 1.30 3 October 3, 2002
Functional Description
Command from the host
The following table shows the commands that the host
may send and their hexadecimal values.
Command Hex Value
Set/Reset Status Indicators ED
Echo EE
Invalid Command EF
Select Alternate Scan Codes F0
Invalid Command F1
Read ID F2
Set Typematic Rate/Delay F3
Enable F4
Default Disable F5
Set Default F6
Set All Keys - Typematic F7
Set All Keys - Make/Break F8
Set All Keys - Make F9
Set All Keys - Typematic/Make/Break FA
Set Key Type - Typematic FB
Set Key Type - Make/Break FC
Set Key Type - Make FD
Resend FE
Reset FF
The commands may be sent to the HT82K628A at any
time and the HT82K628A will respond within 25ms ex-
cept when performing the internal diagnostics or execut-
ing a Reset command.
EDH -Set/Reset status indicators
Three status indicators on the keyboard-Num Lock,
Caps Lock, and Scroll Lock-are accessible by the host.
The HT82K628A activates or deactivates these indica-
tors when it receives a valid command-code sequence
from the system. The command sequence begins with
the command byte (hex ED). The HT82K628A responds
to the command byte with ACK, discontinues scanning,
assignments for this option byte are as follow:
Bit Indicator
0 Scroll Lock Indicator
1 Num Lock Indicator
2 Caps Lock Indicator
3~7 Reserved (Must be 0)
If a bit for an indicator is set to 1, the indicator is turned
on. If a bit is set to 0, the indicator is turned off.
The HT82K628A responds to the option byte with ACK,
sets the indicators and if the HT82K628A was previ-
ously enabled, continues scanning. The status of the in-
dicators will reflect the bits in the option byte and can be
activated or deactivated in any combination. If another
command is received in place of the option byte, execu-
tion of the Set/Reset Mode Indicators command is
stopped, with no change to the indicator status, and the
new command is processed.
Immediately after power-on, the lights default to the off
state. If the Set Default and Default Disable commands
are received, the lamps remain in the state they were in
before the command was received.
EEH -Echo
Echo is a diagnostic aid. When the HT82K628A re-
ceives this command, it issues a hex EE response and if
the HT82K628A was previously enabled, continues
scanning.
EFH and F1H -Invalid command
EFh and F1h are invalid commands and are not sup-
ported. If HT82K628A receives one of these and sends
it, the HT82K628A will not acknowledge the command,
but returns a Resend command and continues in its pre-
vious scanning state.
F0H -Select alternate scan codes
This command instructs the HT82K628A to select one
of the three sets of scan codes. The HT82K628A ac-
knowledges receipt of this command with ACK, clears
both the output buffer and the typematic key. The host
then sends the option byte and the keyboard responds
with another ACK. An option byte value of hex 01 se-
lects scan code set 1, hex 02 selects set 2 and hex 03
selects code set3.
An option byte value of hex 00 causes the HT82K628A
to acknowledge with ACK and sends a byte telling the
host which scan code set is currently in use.
After establishing the new scan code set, the
HT82K628A returns to the scanning state it was in be-
fore receiving the Select Alternate Scan Codes com-
mand.
F2H -Read ID
This command requests identification information from
the HT82K628A. The HT82K628A responds with ACK,
discontinues scanning and sends the two keyboard ID
bytes hex 83h and Abh. After the output of the second ID
byte, the HT82K628A resumes scanning.

HT82K628A
Rev. 1.30 4 October 3, 2002
F3H -Set typematic Rate/Delay
The host issues the Set Typematic Rate/Delay com-
mand to change the typematic rate and delay. The
HT82K628A responds to the command with ACK, stops
scanning and waits for the system to issue the rate/de-
lay value byte. The HT82K628A responds to the value
byte with another ACK, sets the rate and delay to the
value indicated, and continues scanning (if it was previ-
ously enabled). Bit6 and 5 indicate the delay, and bits 4,
3, 2, 1 and 0 indicate the rate. Bit7 is always 0. The delay
is equal to 1 plus the binary value bit 6 and 5, multiplied
by 250ms±20%.
The period (interval from one typematic output to the
next) is determined by the following equation:
Period = (8+A)*(2^B)*0.00417 seconds.
Where:
A = binary value of bits 2, 1, and 0.
B = binary value of bits 4, and 3.
The typematic rate is 1 for each period and are listed as
follows:
Bit Typematic
Rate ±20% Bit Typematic Rate ±20%
00000 30.0 10000 7.5
00001 26.7 10001 6.7
00010 24.0 10010 6.0
00011 21.8 10011 5.5
00100 20.0 10100 5.0
00101 18.5 10101 4.6
00110 17.1 10110 4.3
00111 16.0 10111 4.0
01000 15.0 11000 3.7
01001 13.3 11001 3.3
01010 12.0 11010 3.0
01011 10.9 11011 2.7
01100 10.0 11100 2.5
01101 9.2 11101 2.3
01110 8.0 11110 2.1
01111 8.0 11111 2.0
The default values for the HT82K628A are as follows:
Typematic rate= 10.9 characters per second ±20%
Delay = 500ms±20%
The execution of this command stops without change to
the existing rate if another command is received instead
of the rate/delay value byte.
F4H -Enable
Upon receipt of this command, the HT82K628A will re-
spond with ACK, clears its output buffer, clears the last
typematic key, and starts scanning.
F5H -Default disable
The Default Disable command resets all conditions to
the power on default states. The HT82K628A will re-
spond with ACK, clears its output buffer, sets the default
key types (scan code set 3 operation only) and
typematic rate/delay, and clears the last typematic key.
The HT82K628A then stops scanning and awaits further
command.
F6H -Set default
The Set Default command resets all conditions to the
power on default states. The HT82K628A will respond
with ACK, clears its output buffer, sets the default key
types (scan code set 3 operation only) and typematic
rate/delay, and clears the last typematic key then contin-
ues scanning.
F7H, F8H, F9H, FAH -Set all keys
These commands instruct the HT82K628A to set all
keys to the type listed below:
Hex Value Command
F7 Set All Keys-Typematic
F8 Set All Keys-Make/Break
F9 Set All Keys-Make
FA Set All Keys-Typematic/Make/Break
The HT82K628A will respond with ACK, clears its output
buffer, sets all keys to the type indicated by this com-
mand, and continues scanning (if it was previously en-
abled). Although these commands can be sent using
any code set, they affect only scan code set 3 operation.
FBH, FCH, FDH -Set key type
These commands instruct the HT82K628A to set indi-
vidual keys to the type listed below:
Hex Value Command
FB Set Key Type-Typematic
FC Set Key Type-Make/Break
FD Set Key Type-Make
The HT82K628A will respond with ACK, clears its output
buffer and prepares to receive key identification. Key
identification is accomplished by the host identifying
each key by its scan code value as defined in scan code
set 3. Only scan code set 3 values are valid for key iden-
tification. The type of each identified key is set to the
value indicated by the command. Although these com-
mands can be sent using any code set, they affect only
scan code set 3 operation.

HT82K628A
Rev. 1.30 5 October 3, 2002
FEH -Resend
The host sends this command when it detects an error in
any transmission from the HT82K628A. It is sent only af-
ter a data transmission and before the host allows the
next data output. When a Resend is received, the
HT82K628A sends the previous output again (unless
the previous output was Resend, in which case the
HT82K628A sends the last byte before the Resend
command).
Commands to the host
The following table shows the commands that the
HT82K628A may send to the host, and their hexadeci-
mal values.
Command Hex Value
Key Detection Error/Overrun 00 (Code Set 2 and 3)
Keyboard ID 83AB
Bat Completion Code AA
Bat Failure Core FC
Echo EE
Acknowledge FA
Resend FE
Key Detection Error/Overrun FF (Code Set 1)
00H or FFH -Key detection error
The HT82K628A sends a key detection error character
if conditions in the keyboard make it impossible to iden-
tify a switch closure. If the HT82K628A is using scan
code set 1, the code is FFH. For sets 2 and 3, the code is
00H.
00H or FFH -Overrun
An overrun character is placed in the HT82K628A buffer
and replaces the last code when the buffer capacity has
been exceeded. The code is sent to the host when it
reaches the top of the buffer queue. If the HT82K628A is
using scan code set 1, the code is FFH. For sets 2 and 3,
the code is 00H.
83AbH -Keyboard ID
The keyboard ID consists of 2 bytes, Hex 83AbH. The
HT82K628A responds to the Read ID with ACK, discon-
tinues scanning and sends 2 ID bytes. The low byte is
sent first followed by the high byte. Following the output
of Keyboard ID, the HT82K628A begins scanning.
EEH -Echo
The HT82K628A sends this code in response to an
Echo command.
AAH -BAT completion code
Following satisfactory completion of the BAT, the
HT82K628A sends AAH. Any other code indicates key-
board failure.
FCH -BAT failure code
If a BAT failure occurs, the HT82K628A sends this code,
discontinues scanning and waits for a host response or
reset.
FEH -Resend
The HT82K628A issues a Resend command following
receipt of an invalid input or any input with incorrect par-
ity. If the host sends nothing to the HT82K628A, no re-
sponse is required.
Data communications
·Data output
¨If CLK=0, no transmission (keyboard is inhibited).
¨If CLK=1, DATA=0, no transmission (system re-
quest to send).
¨If CLK=1, DATA=1, transmission permitted.
¨Data will be valid before the trailing edge and be-
yond the leading edge of the clock.
¨The KB checks the clock line for an active level of at
least every 60ms.
¨If line contention occurs (system brings the clock
low before the tenth clock), set clock=data=high.
·Data input
¨The system overrides the clock line for at least
60ms.
¨The keyboard checks the clock line state at inter-
vals of 10ms
¨If a system request-to-send is detected, the key-
board counts 11 data bits.
¨Data will be valid before the rising edge and beyond
the falling edge
¨After the 10th bit, the keyboard checks for an active
level on the ²data²line. If the line is active it is forced
to be inactive, and counts one more bit.
Note: This action signals the system that the
keyboard has received its data. Upon
reception of this signal, the system returns
to the ready state, in which it can accept
keyboard outputs or goes to the inhibit
state until it is ready.
If the keyboard ²data²line is found to be at an inactive
level following the 10th bit, a frame error has occurred,
and the keyboard continues to count until the ²data²
line becomes active. The keyboard then makes the
²data²line inactive and sends a Resend.

HT82K628A
Rev. 1.30 6 October 3, 2002
Data stream
Mode 1,2,3
B1:
B2:
b3:
b4:
b5:
B6
b7:
b8:
b9:
b10:
b11:
start bit
always 0
data bit 0
data bit 1
data bit 2
data bit 3
data bit 4
data bit 5
data bit 6
data bit 7
parity bit
(odd par)
stop bit
always 1
Note: The parity bit is either 1 or 0, and the 8 data bits, plus the parity bit, always have an odd number of 1ms.
Key code set 1
Key Number
and Symbol Make/Break Code Key Number and Symbol Make/Break Code
1 ~ ' 29/A9 47 X 2D/AD
2 ! 1 02/82 48 C 2E/AE
3 @ 2 03/83 49 V 2F/AF
4 # 3 04/84 50 B 30/B0
5 $ 4 05/85 51 N 31/B1
6 % 5 06/86 52 M 32/B2
7 ^ 6 07/87 53 < , 33/B3
8 & 7 08/88 54 > . 34/B4
9 * 8 09/89 55 ? / 35/B5
10 ( 9 0A/8A 57 Shift (R) 36/B6
11 ) 0 0B/8B 58 Ctrl (L) 1D/9D
12 _ - 0C/8C 60 Alt (L) 38/B8
13 + = 0D/8D 61 Space 39/B9
14 56 7D/D6 FD 62 Alt (R) E0 38/E0 B8
15 Back Space 0E/8E 64 Ctrl (R) E0 1D/E0 9D
16 Tab 0F/8F 90 Num Lock 45/C5
17 Q 10/90 91 7 Home 47/C7
18 W 11/91 92 4 ¬4B/CB
19 E 12/92 93 1 End 4F/CF
20 R 13/93 96 8 48/C8
21 T 14/94 97 5 4C/CC
22 Y 15/95 98 2 ¯50/D0
23 U 16/96 99 0 Ins 52/D2
24 I 17/97 100 * 37/B7
25 O 18/98 101 9 PgUp 49/C9
26 P 19/99 102 6 ®4D/CD
27 { [ 1A/9A 103 3 PgDn 51/D1
28 } ] 1B/9B 104 . Del 53/D3
*29 ½\ 2B/AB 105 - 4A/CA

HT82K628A
Rev. 1.30 7 October 3, 2002
Key Number
and Symbol Make/Break Code Key Number and Symbol Make/Break Code
30 Caps Lock 3A/BA 106 + 4E/CE
31 A 1E/9E 107 7E/FE
32 S 1F/9F 108 Enter E0 1C/E0 9C
33 D 20/A0 110 ESC 01/81
34 F 21/A1 112 F1 3B/BB
35 G 22/A2 113 F2 3C/BC
36 H 23/A3 114 F3 3D/BD
37 J 24/A4 115 F4 3E/BE
38 K 25/A5 116 F5 3F/BF
39 L 26/A6 117 F6 40/C0
40 : ; 27/A7 118 F7 41/C1
41 28/A8 119 F8 42/C2
**42 ½\ 2B/AB 120 F9 43/C3
43 Enter 1C/9C 121 F10 44/C4
44 Shift (L) 2A/AA 122 F11 57/D7
**45 Macro 56/D6 123 F12 58/D8
46 Z 2C/AC 125 Scroll Lock 46/C6
*101-Key Keyboard Only
**102-Key Keyboard Only
Key Number
and Symbol
Base Case
Shift+Num Left-Shift Right-Shift Num Lock
75
76
79
80
81
83
84
85
86
89
Insert
Delete
¬
Home
End

¯
PgUp
PgDn
®
E0 52
/E0 D2
E0 53
/E0 D3
E0 4B
/E0 CB
E0 47
/E0 C7
E0 4F
/E0 CF
E0 48
/E0 C8
E0 50
/E0 D0
E0 49
/E0 C9
E0 51
/E0 D1
E0 4D
/E0 CD
E0 AA E0 52
/E0 D2 E0 2A
E0 AA E0 53
/E0 D3 E0 2A
E0 AA E0 4B
/E0 CB E0 2A
E0 AA E0 47
/E0 C7 E0 2A
E0 AA E0 4F
/E0 CF E0 2A
E0 AA E0 48
/E0 C8 E0 2A
E0 AA E0 50
/E0 D0 E0 2A
E0 AA E0 49
/E0 C9 E0 2A
E0 AA E0 51
/E0 D1 E0 2A
E0 AA E0 4D
/E0 CD E0 2A
E0 B6 E0 52
/E0 D2 E0 36
E0 B6 E0 53
/E0 D3 E0 36
E0 B6 E0 4B
/E0 CB E0 36
E0 B6 E0 47
/E0 C7 E0 36
E0 B6 E0 4F
/E0 CF E0 36
E0 B6 E0 48
/E0 C8 E0 36
E0 B6 E0 50
/E0 D0 E0 36
E0 B6 E0 49
/E0 C9 E0 36
E0 B6 E0 51
/E0 D1 E0 36
E0 B6 E0 4D
/E0 CD E0 36
E0 2A E0 52
/E0 D2 E0 AA
E0 2A E0 53
/E0 D3 E0 AA
E0 2A E0 4B
/E0 CB E0 AA
E0 2A E0 47
/E0 C7 E0 AA
E0 2A E0 4F
E0 CF E0 AA
E0 2A E0 48
E0 C8 E0 AA
E0 2A E0 50
/E0 D0 E0 AA
E0 2A E0 49
/E0 C9 E0 AA
E0 2A E0 51
E0 D1 E0 AA
E0 2A E0 4D
E0 CD E0 AA
L Win E0 5B E0 AA E0 5B E0 B6 E0 5B E0 2A E0 5B
/E0 DB /E0 DB E0 2A /E0 DB E0 36 /E0 DB E0 AA
R Win E0 5C E0 AA E0 5C E0 B6 E0 5C E0 2A E0 5C
/E0 DC /E0 DC E0 2A /E0 DC E0 36 /E0 DC E0 AA
APP E0 5D E0 AA E0 5D E0 B6 E0 5D E0 2A E0 5D
/E0 DD /E0 DD E0 2A /E0 DD E0 36 /E0 DD E0 AA
When both shift keys are held down:
key number 75
Both Shift
E0 AA E0 B6 E0 52/E0 D2 E0 2A E0 36
Key Number
and Symbol Base Left-Shift Right-Shift
95 / E0 35/E0 B5 E0 AA E0 35/E0 B5 E0 2A E0 B6 E0 35/E0 B5 E0 36
When both shift keys are held down: key number 95 Both Shift
E0 AA E0 B6 E0 35/E0 B5 E0 2A E0 36

HT82K628A
Rev. 1.30 8 October 3, 2002
Key Number
and Symbol Base Shift/Ctrl Alt
124 Print Screen E0 2A E0 37/E0 B7 E0 AA E0 37/E0 B7 54/D4
Key Number
and Symbol Base Ctrl
126 Pause E1 1D 45 E1 9D C5 E0 46 E0 C6
This key is not typematic, all associated scan codes occur on the make code.
Key Number
and Function Make/Break code Default
ACPI Power E0 5E/E0 DE Make/Break
ACPI Sleep E0 5F/E0 DF Make/Break
ACPI Wake-up E0 63/E0 E3 Make/Break
Key Number
and Function Make/Break code Default
56 Brazil BA0 73/F3 Typematic
131 Japanese J131 7B/FB Make
132 Japanese J132 79/F9 Make
133 Japanese J133 70/F0 Make
150 Korea KC-L F1/-Make
151 Korea KC-R F0/-Make
Multimedia Key Function Make/Break code
E-Mail E0 6C/E0 EC
WWW Home E0 32/E0 B2
WWW Favorites E0 66/E0 E6
WWW Search E065/E0 E5
WWW Refresh E0 67/E0 E7
WWW Stop E0 68/E0 E8
WWW Forward E0 69/E0 E9
WWW Back E0 6A/E0 EA
Media E0 6D/E0 ED
Play/Pause E0 22/E0 A2
Stop E0 24/E0 A4
Prev Track E0 10/E0 90
Next Track E0 19/E0 99
Volume+ E0 30/E0 B0
Volume-E0 2E/E0 AE
Mute E0 20/E0 A0
My Computer E0 6B/E0 EB
Calculator E0 21/E0 A1
Screen save E0 26/E0 A6
Rec E0 1E/E0 9E
Rew E0 17/E0 97
Minimize E0 2D/E0 AD
Eject E0 11/E0 91

HT82K628A
Rev. 1.30 9 October 3, 2002
Key code set 2
Key Number
and Symbol Make/Break Code Key Number and Symbol Make/Break Code
1 ~ ' 0E/F0 0E 47 X 22/F0 22
2 ! 1 16/F0 16 48 C 21/F0 21
3 @ 2 1E/F0 1E 49 V 2A/F0 2A
4 # 3 26/F0 26 50 B 32/F0 32
5 $ 4 25/F0 25 51 N 31/F0 31
6 % 5 2E/F0 2E 52 M 3A/F0 3A
7 ^ 6 36/F0 36 53 < , 41/F0 41
8 & 7 3D/F0 3D 54 > . 49/F0 49
9 * 8 3E/F0 3E 55 ? / 4A/F0 4A
10 ( 9 46/F0 46 57 Shift (R) 59/F0 59
11 ) 0 45/F0 45 58 Ctrl (L) 14/F0 14
12 _ - 4E/F0 4E 60 Alt (L) 11/F0 11
13 + = 55/F0 55 61 Space 29/F0 29
14 6A/F0 6A 62 Alt (R) E0 11/E0 F0 11
15 Back Space 66/F0 66 64 Ctrl (R) E0 14/E0 E0 F0 14
16 Tab 0D/F0 0D 90 Num Lock 77/F0 77
17 Q 15/F0 15 91 7 Home 6C/F0 6C
18 W 1D/F0 1D 92 4 ¬6B/F0 6B
19 E 24/F0 24 93 1 End 69/F0 69
20 R 2D/F0 2D 96 8 75/F0 75
21 T 2C/F0 2C 97 5 73/F0 73
22 Y 35/F0 35 98 2 ¯72/F0 72
23 U 3C/F0 3C 99 0 Ins 70/F0 70
24 I 43/F0 43 100 * 7C/F0 7C
25 O 44/F0 44 101 9 PgUp 7D/F0 7D
26 P 4D/F0 4D 102 6 ®74/ F0 74
27 { [ 54/F0 54 103 3 PgDn 7A/ F0 7A
28 } ] 5B/F0 5B 104 . Del 71/F0 71
*29 ½\ 5D/F0 5D 105 - 7B/F0 7B
30 Caps Lock 58/F0 58 106 + 79/F0 79
31 A 1C/F0 1C 107 6D/F0 6D
32 S 1B/F0 1B 108 Enter E0 5A/E0 F0 5A
33 D 23/F0 23 110 ESC 76/F0 76
34 F 2B/F0 2B 112 F1 05/F0 05
35 G 34/F0 34 113 F2 06/F0 06
36 H 33/F0 33 114 F3 04/F0 04
37 J 3B/F0 3B 115 F4 0C/F0 0C
38 K 42/F0 42 116 F5 03/F0 03
39 L 4B/F0 4B 117 F6 0B F0 0B

HT82K628A
Rev. 1.30 10 October 3, 2002
Key Number
and Symbol Make/Break Code Key Number and Symbol Make/Break Code
40 : ; 4C/F0 4C 118 F7 83/F0 83
41 52/F0 52 119 F8 0A/F0 0A
**42 ½\ 5D/F0 5D 120 F9 01/F0 01
43 Enter 5A/F0 5A 121 F10 09/F0 09
44 Shift (L) 12/F0 12 122 F11 78/F0 78
**45 Macro 61/F0 61 123 F12 07/F0 07
46 Z 1A/F0 1A 125 Scroll Lock 7E/F0 7E
*101-Key Keyboard Only
**102-Key Keyboard Only
Key Number
and Symbol
Base Case
Shift+Num Left-Shift Right-Shift Num Lock
75
76
79
80
81
83
84
85
86
89
Insert
Delete
¬
Home
End

¯
PgUp
PgDn
®
E0 70
/E0 F0 70
E0 71
/E0 F0 71
E0 6B
/E0 F0 6B
E0 6C
/E0 F0 6C
E0 69
/E0 F0 69
E0 75
/E0 F0 75
E0 72
/E0 F0 72
E0 7D
/E0 F0 7D
E0 7A
/E0 F0 7A
E0 74
/E0 F0 74
E0 F0 12 E0 70
/E0 F0 70 E0 12
E0 F0 12 E0 71
/E0 F0 71 E0 12
E0 F0 12 E0 6B
/E0 F0 6B E0 12
E0 F0 12 E0 6C
/E0 F0 6C E0 12
E0 F0 12 E0 69
/E0 F0 69 E0 12
E0 F0 12 E0 75
/E0 F0 75 E0 12
E0 F0 12 E0 72
/E0 F0 72 E0 12
E0 F0 12 E0 7D
/E0 F0 7D E0 12
E0 F0 12 E0 7A
/E0 F0 7A E0 12
E0 F0 12 E0 74
/E0 F0 74 E0 12
E0 F0 59 E0 70
/E0 F0 70 E0 59
E0 F0 59 E0 71
/E0 F0 71 E0 59
E0 F0 59 E0 6B
/E0 F0 6B E0 59
E0 F0 59 E0 6C
/E0 F0 6C E0 59
E0 F0 59 E0 69
/E0 F0 69 E0 59
E0 F0 59 E0 75
/E0 F0 75 E0 59
E0 F0 59 E0 72
/E0 F0 72 E0 59
E0 F0 59 E0 7D
/E0 F0 7D E0 59
E0 F0 59 E0 7A
/E0 F0 7A E0 59
E0 F0 59 E0 74
/E0 F0 74 E0 59
E0 12 E0 70
/E0 F0 70 E0 F0 12
E0 12 E0 71
/E0 F0 71 E0 F0 12
E0 12 E0 6B
/E0 F0 6B E0 F0 12
E0 12 E0 6C
/E0 F0 6C E0 F0 12
E0 12 E0 69
/E0 F0 69 E0 F0 12
E0 12 E0 75
/E0 F0 75 E0 F0 12
E0 12 E0 72
/E0 F0 72 E0 F0 12
E0 12 E0 7D
/E0 F0 7D E0 F0 12
E0 12 E0 7A
/E0 F0 7A E0 F0 12
E0 12 E0 74
/E0 F0 74 E0 F0 12
L Win E0 1F E0 F0 12 E0 1F E0 F0 59 E0 1F E0 12 E0 1F
/E0 F0 1F /E0 F0 1F E0 12 /E0 F0 1F E0 59 /E0 F0 1F E0 F0 12
R Win E0 27 E0 F0 12 E0 27 E0 F0 59 E0 27 E0 12 E0 27
/E0 F0 27 /E0 F0 27 E0 12 /E0 F0 27 E0 59 /E0 F0 27 E0 F0 12
APP E0 2F E0 F0 12 E0 2F E0 F0 59 E0 2F E0 12 E0 2F
/E0 F0 2F /E0 F0 2F E0 12 /E0 F0 2F E059 /E0 F0 2F E0 F0 12
When both shift keys are held down:
key number 75
Both Shift
E0 AA E0 B6 E0 52/E0 D2 E0 2A E0 36
Key Number
and Symbol Base Left-Shift Right-Shift
95 / E0 4A/E0 F0 4A E0 F0 12 E0 4A/E0 F0 4A E0 12 E0 F0 59 E0 4A/E0 F0 4A E0 59
When both shift keys are held down:
key number 95
Both Shift
E0 F0 12 E0 F0 59 E0 4A/E0 F0 4A E0 12 E0 59
Key Number
and Symbol Base Shift/Ctrl Alt
124 Print Screen E0 12 E0 7C/E0 F0 7C E0 F0 12 E0 7C/E0 F0 7C 84/F0 84
Key Number
and Symbol Base Ctrl
126 Pause E1 14 77 E1 F0 14 F0 77 E0 7E E0 F0 7E
This key is not typematic, all associated scan codes occur on the make code.

HT82K628A
Rev. 1.30 11 October 3, 2002
Key Number
and Function Make/Break code Default
ACPI Power E0 37/E0 F0 37 Make/Break
ACPI Sleep E0 3F/E0 F0 3F Make/Break
ACPI Wake-up E0 5E/E0 F0 5E Make/Break
Key Number
and Function Make/Break code Default
56 Brazil BA0 51/F0 51 Typematic
131 Japanese J131 67/F0 67 Make
132 Japanese J132 64/F0 64 Make
133 Japanese J133 13/F0 13 Make
150 Korea KC-L F1/-Make
151 Korea KC-R F2/-Make
Multimedia Key Function Make/Break code
E-Mail E0 48/E0 F0 48
WWW Home E0 3A/E0 F0 3A
WWW Favorites E0 18/E0 F0 18
WWW Search E0 10/E0 F0 10
WWW Refresh E0 20/E0 F0 20
WWW Stop E0 28/E0 F0 28
WWW Forward E0 30/E0 F0 30
WWW Back E0 38/E0 F0 38
Media E0 50/E0 F0 50
Play/Pause E0 34/E0 F0 34
Stop E0 3B/E0 F0 3B
Prev Track E0 15/E0 F0 15
Next Track E0 4D/E0 F0 4D
Volume+ E0 32/E0 F0 32
Volume-E0 21/E0 F0 21
Mute E0 23/E0 F0 23
My Computer E0 40/E0 F0 40
Calculator E0 2B/E0 F0 2B
Screen save E0 4B/E0 F0 4B
Rec E0 1C/E0 F0 1C
Rew E0 43/E0 F0 43
Minimize E0 22/E0 F0 22
Eject E0 1D/E0 F0 1D

HT82K628A
Rev. 1.30 12 October 3, 2002
Key code set 3
Key
Number
Make
/Break Code
Default
Key State
Key
Number
Make
/Break Code
Default
Key State
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
*29
30
31
32
0E/F0 0E
16/F0 16
1E/F0 1E
26/F0 26
25/F0 25
2E/F0 2E
36/F0 36
3D/F0 3D
3E/F0 3E
46/F0 46
45/F0 45
4E/F0 4E
55/F0 55
5D/F0 5D
66/F0 66
0D /F0 0D
15/F0 15
1D/F0 1D
24/F0 24
2D/F0 2D
2C/F0 2C
35/F0 35
3C/F0 3C
43/F0 43
44/F0 44
4D/F0 4D
54/F0 54
5B/F0 5B
5C/F0 5C
14/F0 14
1C/F0 1C
1B/F0 1B
Typematic
Typematic
Typematic
Typematic
Typematic
Typematic
Typematic
Typematic
Typematic
Typematic
Typematic
Typematic
Typematic
Typematic
Typematic
Typematic
Typematic
Typematic
Typematic
Typematic
Typematic
Typematic
Typematic
Typematic
Typematic
Typematic
Typematic
Typematic
Typematic
Make/Break
Typematic
Typematic
55
57
58
59
60
61
62
63
64
75
76
79
80
81
83
84
85
86
89
90
91
92
93
95
96
97
98
99
100
101
102
103
4A/F0 4A
59/F0 59
11/F0 11
8B/F0 8B
19/F0 19
29/F0 29
39/F0 39
8C/F0 8C
58/F0 58
67/F0 67
64/F0 64
61/F0 61
6E/F0 6E
65/F0 65
63/F0 63
60/F0 60
6F/F0 6F
6D/F0 6D
6A/F0 6A
76/F0 76
6C/F0 6C
6B/F0 6B
69/F0 69
77/F0 77
75/F0 75
73/F0 73
72/F0 72
70/F0 70
7E/F0 7E
7D/F0 7D
74/F0 74
7A/F0 7A
Typematic
Make/Break
Make/Break
Make/Break
Make/Break
Typematic
Make Only
Make/Break
Make Only
Make Only
Typematic
Typematic
Make Only
Make Only
Typematic
Typematic
Make Only
Make Only
Typematic
Make Only
Make Only
Make Only
Make Only
Make Only
Make Only
Make Only
Make Only
Make Only
Make Only
Make Only
Make Only
Make Only
33
34
35
36
37
38
39
40
41
**42
43
44
**45
46
47
48
49
50
51
52
53
54
23/F0 23
2B/F0 2B
34/F0 34
33/F0 33
3B/F0 3B
42/F0 42
4B/F0 4B
4C/F0 4C
52/F0 52
53/F0 53
5A/F0 5A
12/F0 12
13/F0 13
1A/F0 1A
22/F0 22
21/F0 21
2A/F0 2A
32/F0 32
31/F0 31
3A/F0 3A
41/F0 41
49/F0 49
Typematic
Typematic
Typematic
Typematic
Typematic
Typematic
Typematic
Typematic
Typematic
Typematic
Typematic
Make/Break
Typematic
Typematic
Typematic
Typematic
Typematic
Typematic
Typematic
Typematic
Typematic
Typematic
104
105
106
107
108
110
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
71/F0 71
84/F0 84
7C/F0 7C
7B/F0 7B
79/F0 79
08/F0 08
07/F0 07
0F/F0 0F
17/F0 17
1F/F0 1F
27/F0 27
2F/F0 2F
37/F0 37
3F/F0 3F
47/F0 47
4F/F0 4F
56/F0 56
5E/F0 5E
57/F0 57
5F/F0 5F
62/F0 62
8D/F0 8D
Make Only
Make Only
Typematic
Make Only
Make Only
Make Only
Make Only
Make Only
Make Only
Make Only
Make Only
Make Only
Make Only
Make Only
Make Only
Make Only
Make Only
Make Only
Make Only
Make Only
Make Only
Typematic
*101-Key Keyboard Only
**102-Key Keyboard Only

Timing Diagrams
Data output
Keyboard data input
HT82K628A
Rev. 1.30 13 October 3, 2002
Key Number
and Function Make/Break code Default
56 Brazil BA0 51/F0 51 Typematic
131 Japanese J131 67/F0 67 Make
132 Japanese J132 64/F0 64 Make
133 Japanese J133 13/F0 13 Make
150 Korea KC-L F1/-Make
151 Korea KC-R F2/-Make
( 1 ) ( 3 ) ( 3 ) ( 3 ) ( 3 ) ( 4 )
1 s t
C L K 2nd C L K 1 0 t h C L K 1 1 t h C L K
D A T A S t a r t B i t B i t 0 a r i t y B i t S t o p B i t
T 5
T 3 T 4
T 1 T 2
( 2 )
( 5 ) ( 7 )
C L K
( 6 )
T i m i n g P a r a m e t e r
t h e a u x i l i a r y d e v i c e d o e s n o t s t a r t a n o t h e r t r a n s m i s s i o n
T 1 D A T A t r a n s i t i o n t o t h e f a l l i n g e d g e o f C L K
T 2 R i s i n g e d g e o f C L K t o D A T A t r a n s i t i o n
T 3 D u r a t i o n o f C L K i n a c t i v e
T 4 D u r a t i o n o f C L K a c t i v e
T 5 T i m e t o a u x i l i a r y d e v i c e i n h i b i t a f t e r c l o c k 1 1 t o e n s u r e
M i n / M a x
5 / T 4 - 5 ms e c
5 / 2 5 ms e c
3 0 / 5 0 ms e c
> 0 / 5 0 ms e c
3 0 / 5 0 ms e c
( 1 )
( 3 )
( 4 )
I/O
I n h i b i t
2nd
C L K 1 0 t h C L K 1 1 t h C L K
D A T A S t a r t B i t B i t 0 a r i t y B i t S t o p B i t
T 7 T 8
T 9
( 5 ) ( 7 )
C L K
( 6 )
T i m i n g P a r a m e t e r
w h e n t h e a u x i l i a r y d e v i c e s a m p l e s D A T A
T 7
D u r a t i o n o f C L K i n a c t i v e
T 8 D u r a t i o n o f C L K a c t i v e
T 9 T i m e f r o m i n a c t i v e t o a c t i v e C L K t r a n s i t i o n , u s e d t o t i m e
M i n / M a x
1 s t
C L K
( 2 )
9 t h
C L K
( 8 )
( 5 )
3 0 / 5 0 ms e c
3 0 / 5 0 ms e c
5/25
m
s e c

Mini keyboard operation manual
·Macro key
¨Open Old File
Should send <Ctrl>+<O> to system when pressed.
¨SAVE
Should send <Ctrl>+<S> to system when pressed.
¨PRINT
Should send <Ctrl>+<P> to system when pressed.
¨CUT
Should send <Ctrl>+<X> to system when pressed.
¨COPY
Should send <Ctrl>+<C> to system when pressed.
¨PASTE
Should send <Ctrl>+<V> to system when pressed.
¨Rotate Window
Press this key to switch the activated task window. Should send <Alt>+<Tab> to system when pressed.
¨Close Window
Press this key to close the window. Should send <Alt>+<F4> to system when pressed.
HT82K628A
Rev. 1.30 14 October 3, 2002

·Fn key usage
Status
Key
Location
Fn Num
Lock Fn Num Lock Fn Num Lock Fn Num Lock
OFF OFF ON OFF OFF ON ON ON
7 &7 Home 7 7
8*8 88
9 (9 PgUp 9 9
0)0 * * 0
UU ¬4U
II 5 I
OO ®6O
PP - - P
J J End 1 J
KK ¯2K
L L PgDn 3 L
:; :; + + :;
M M Ins 0 M
>. >. Del . >.
?/ ?/ / / ?/
Enter Enter (L) Enter(R) Enter(R) Enter(L)
F1/F11 F1 F11 F1 F11
F2/F12 F2 F12 F2 F12
F10/
ScrLock F10 ScrLock F10 ScrLock
/PgUp Page Up Page Up
¯/PgDn ¯Page Down ¯Page Down
¬/Home ¬Home ¬Home
®/End ®End ®End
HT82K628A
Rev. 1.30 15 October 3, 2002

Key matrix
C0 C1 C2 C3 C4 C5 C6 C7
R0 PAUSE
126 Pre Track Stop Play/Pause CTRL-R 64
Next
Track
CTRL-L
58
F5
116
R1 Q
17
TAB
16
A
31
ESC
110
Z
46
N-CHG
131
¢(~)
1
1(!)
2
R2 W
18
CAPS
LOCK
30
S
32
|(\)
45
X
47
CHG
132
F1
112
2(@)
3
R3 E
19
F3
114
D
33
F4
115
C
48
ROMA
133
F2
113
3(#)
4
R4 R
20
T
21
F
34
G
35
V
49
B
50
5(%)
6
4($)
5
R5 U
23
Y
22
J
37
H
36
M
52
N
51
6(^)
7
7(&)
8
R6 I
24
](})
28
K
38
F6
117
,(<)
53
\(-)
56
=(+)
13
8(*)
9
R7 O
25
F7
118
L
39 Ctrl(R)+O .(>) 54 APP F8 119
9(¢(¢)
10
R8 P
26
[({)
27
;(:)
40
'(²)
41
|(\)
42
/(?)
55
_(-)
12
0(¢)¢)
11
R9
SCROLL
LOCK
125
Alt(R)+F4 Vol- ALT-L
60 Vol+ ALT-R 62 Mute PRINT
SCREEN
R10 |(\)
14
BACK
15
\(|)
29
F11
122
ENTER-L
43
F12
123
F9
120
F10
121
R11 7(Home)
91
4(¬)
92
1(End)
93
SPACE
61
NUM
LOCK
90
¯
84
DEL
76 POWER
R12 8()
96
5
97
2(¯)
98
0(Ins)
99
/
95
®
89
INS
75 SLEEP
R13 9(PgUp)
101
6(®)
102
3(PgDn)
103
.(Del)
104
*
100
-
105
PgUp
85
PgDn
86
R14 +
106
.
107
ENTER-R
108

83 Ctrl(R)+X ¬
79
HOME
80
END
81
R15 Wake-up SHIFT-L
44
SHIFT-R
57
WWW
Search Alt(R)+Tab Ctrl(R)+P F1/F11 FN
R16 Screen
Save WIN-L Ctrl(R)+C Rec Rew Min Eject F10/ Scroll
R17 KC-L
150 Ctrl(R)+V WIN-R 00 000 Ctrl(R)+S F2/F12 KC-R 151
R18 Media E-mail WWW
Home
WWW
Back
WWW
Forward
WWW
Stop
WWW
Refresh
WWW
Bkmk
R19 My
Computer Calculator /
Page Up
¯/
Page Down
¬/
Home
®/
END
HT82K628A
Rev. 1.30 16 October 3, 2002

Application Circuits
Note: Fn Select ®GND: Enable the Mini Keyboard
Macro Key Select ®GND: Disable the Macro Key
HT82K628A
Rev. 1.30 17 October 3, 2002
H T 8 2 K 6 2 8 A
0 . 1
m
F
V D D
G N D
L E D 2
VD D
F . B .
C A
N U M
S C R
R E S E T
C L K
3 2
1 5
3 0
3 1
1 9
1 8
V D D
V S S
1 0
m
F
1 7
1 6
L E D 1
L E D 0
D A T A
C L O C K
VD D
47k
W
0 . 1
m
F
D A T A
O S C 1
VD D
F n S e l e c t
M a c r o K e y s e l e c t
3 3
2 0
2 1
C 0
C 1
C 2
C 3
C 4
C 5
C 6
C 7
R 0
R 1
R 2
R 3
R 4
R 5
R 6
R 7
R 8
R 9
R 1 0
R 1 1
R 1 2
R 1 3
R 1 4
R 1 5
R 1 6
R 1 7
R 1 8
R 1 9
6
5
4
3
3 8
3 7
3 6
3 5
1 0
9
8
7
2
1
4 0
3 9
2 9
2 8
2 7
2 6
2 5
2 4
2 3
2 2
1 4
1 3
1 2
1 1
5 8 . 3 k
W
1N 4148
o p t i o n

Package Information
40-pin DIP (600mil) outline dimensions
Symbol Dimensions in mil
Min. Nom. Max.
A 2045 ¾2065
B 535 ¾555
C 145 ¾155
D 125 ¾145
E16
¾20
F50
¾70
G¾100 ¾
H 595 ¾615
I 635 ¾670
a0°¾15°
HT82K628A
Rev. 1.30 18 October 3, 2002
4 0
1
2 1
2 0
a
A
B
C
D
EF G
H
I

HT82K628A
Rev. 1.30 19 October 3, 2002
Copyright Ó2002by HOLTEK SEMICONDUCTOR INC.
The information appearing in this Data Sheet is believed to be accurate at the time of publication. However, Holtek as-
sumes no responsibility arising from the use of the specifications described. The applications mentioned herein are used
solely for the purpose of illustration and Holtek makes no warranty or representation that such applications will be suitable
without further modification, nor recommends the use of its products for application that may present a risk to human life
due to malfunction or otherwise. Holtek¢s products are not authorized for use as critical components in life support devices
or systems. Holtek reserves the right to alter its products without prior notification. For the most up-to-date information,
please visit our web site at http://www.holtek.com.tw.
Holtek Semiconductor Inc. (Headquarters)
No.3, Creation Rd. II, Science-based Industrial Park, Hsinchu, Taiwan
Tel: [phone]
Fax: [phone]
http://www.holtek.com.tw
Holtek Semiconductor Inc. (Sales Office)
11F, No.576, Sec.7 Chung Hsiao E. Rd., Taipei, Taiwan
Tel: [phone]
Fax: [phone]
Fax: [phone] (International sales hotline)
Holtek Semiconductor (Shanghai) Inc.
7th Floor, Building 2, No.889, Yi Shan Rd., Shanghai, China
Tel: [phone]
Fax: [phone]
http://www.holtek.com.cn
Holtek Semiconductor (Hong Kong) Ltd.
RM.711, Tower 2, Cheung Sha Wan Plaza, 833 Cheung Sha Wan Rd., Kowloon, Hong Kong
Tel: [phone]
Fax: [phone]
Holmate Semiconductor, Inc.
48531 Warm Springs Boulevard, Suite 413, Fremont, CA 94539
Tel: [phone]
Fax: [phone]
http://www.holmate.com