HT82K629A-40DIPLF HOLTEK, HT82K629A-40DIPLF Datasheet - Page 5

• Manufacturer Part Number: HT82K629A-40DIPLF
• Description: IC, USB/PS2 CONT, WIN 2000 KEYBOARD
• Manufacturer: HOLTEK

Specifications of HT82K629A-40DIPLF

• Usb Type: Keyboard Encoder
• Usb Version: 1.1
• Supply Voltage Range: 4.4V To 5.5V
• Operating Temperature Range: 0°C To +70°C
• Digital Ic Case Style: DIP
• No. Of Pins: 40
• Operating Temperature Max: 70°C
• Base Number: 82
• Rohs Compliant: Yes
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

F3H - Set Typematic Rate/Delay
The host issues the Set Typematic Rate/Delay com-
mand to change the typematic rate and delay. The
HT82K629A responds to the command with ACK, stops
scanning and waits for the system to issue the rate/de-
lay value byte. The HT82K629A 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). Bits 6 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, mul-
tiplied 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:
The default values for the HT82K629A are as follows:
Typematic rate= 10.9 characters per second
Delay = 500ms 20%
The execution of this command stops without changes
to the existing rate if another command is received in-
stead of the rate/delay value byte.
Rev. 1.40
00000
00001
00010
00011
00100
00101
00110
00111
01000
01001
01010
01011
01100
01101
01110
01111
Bit
Rate ± 20%
Typematic
30.0
26.7
24.0
21.8
20.0
18.5
17.1
16.0
15.0
13.3
12.0
10.9
10.0
9.2
8.0
8.0
10000
10001
10010
10011
10100
10101
10110
10111
11000
11001
11010
11011
11100
11101
11110
11111
Bit
Rate ± 20%
Typematic
7.5
6.7
6.0
5.5
5.0
4.6
4.3
4.0
3.7
3.3
3.0
2.7
2.5
2.3
2.1
2.0
20%
5
F4H - Enable
Upon receipt of this command, the HT82K629A 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 HT82K629A will
respond with ACK, clears its output buffer, sets the de-
fault typematic rate/delay, and clears the last typematic
key. The HT82K629A then stops scanning and awaits
further command.
F6H - Set Default
The Set Default command resets all conditions to the
power on default states. The HT82K629A will respond
with ACK, clears its output buffer, sets the default key
typematic rate/delay, and clears the last typematic key
then continues scanning.
F7H, F8H, F9H, FAH - Set All Keys
Since HT82K629A do not support keyboard code set 3
format, so it will not acknowledge the command but re-
turns a Resend command and continues in its previous
scanning state.
FBH, FCH, FDH - Set Key Type
Since HT82K629A do not support keyboard code set 3
format, so it will not acknowledge the command but re-
turns a Resend command and continues in its previous
scanning state.
FEH - Resend
The host sends this command when it detects an error in
any transmission from the HT82K629A. It is sent only af-
ter a data transmission and before the host allows the
next data output. When a Resend is received, the
HT82K629A sends the previous output again (unless
the previous output was Resent, in which case the
HT82K629A sends the last byte before the Resend
command).
September 15, 2004
HT82K629A