HT6221B 데이터 시트보기 (PDF) - Holtek Semiconductor
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HT6221B Datasheet PDF : 19 Pages
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HT6220A/HT6221A/HT6221B/HT6222A
Functional Description
Keyboard Scan
The devices remain in the halt mode during the standby
state (at this time, the oscillator stops, and the standby
current<1mA). The HT6220A consists of 30 active keys,
HT6221A has 32 active keys, HT6221B has 48 active
keys, and the HT6222A has 64 active keys. The key-
board forms of the devices are shown below.
· The HT6220A keyboard form
C1 C2 C3 C4 C5
R1
K1
K5
K 9 K 13 K 17
R2
K2
K 6 K 10 K 14 K 18
R3
K3
K 7 K 11 K 15 K 19
R4
K4
K 8 K 12 K 16 K 20
R 5 K 33 K 37 K 41 K 45 K 49
R 6 K 34 K 38 K 42 K 46 K 50
· The HT6221A keyboard form
C1 C2 C3 C4
C5 C6 C7 C8
R1
K1
K5
K 9 K 13 K 17 K 21 K 25 K 29
R2
K2
K 6 K 10 K 14 K 18 K 22 K 26 K 30
R3
K3
K 7 K 11 K 15 K 19 K 23 K 27 K 31
R4
K4
K 8 K 12 K 16 K 20 K 24 K 28 K 32
· The HT6221B keyboard form
C1 C2 C3 C4
C5 C6 C7 C8
R1
K1
K5
K 9 K 13 K 17 K 21 K 25 K 29
R2
K2
K 6 K 10 K 14 K 18 K 22 K 26 K 30
R3
K3
K 7 K 11 K 15 K 19 K 23 K 27 K 31
R4
K4
K 8 K 12 K 16 K 20 K 24 K 28 K 32
R 5 K 33 K 37 K 41 K 45 K 49 K 53 K 57 K 61
R 6 K 34 K 38 K 42 K 46 K 50 K 54 K 58 K 62
· The HT6222A keyboard form
C1
C2 C3 C4
C5 C6 C7 C8
R1
K1
K5
K 9 K 13 K 17 K 21 K 25 K 29
R2
K2
K 6 K 10 K 14 K 18 K 22 K 26 K 30
R3
K3
K 7 K 11 K 15 K 19 K 23 K 27 K 31
R4
K4
K 8 K 12 K 16 K 20 K 24 K 28 K 32
R 5 K 33 K 37 K 41 K 45 K 49 K 53 K 57 K 61
R 6 K 34 K 38 K 42 K 46 K 50 K 54 K 58 K 62
R7
K 35 K 39 K 43 K 47 K 51 K 55 K 59 K 63
R8
K 36 K 40 K 44 K 48 K 52 K 56 K 60 K 64
When one of the keys (30, 32, 48 or 64 keys) is triggered
for over 36ms, the oscillator is enabled and the chip is acti-
vated. If the key is pressed and held for 108ms or less, the
108ms transmission codes are enabled and comprised of
a header code (9ms), an off code (4.5ms), low byte ad-
dress codes (9ms~18ms), high byte address codes
(9ms~18ms), 8-bit data codes (9ms~18ms), and the in-
verse codes of the 8-bit data codes (18ms~9ms). After the
pressed key is held for 108ms, if the key is still held down,
the transmission codes turn out to be a composition of
header (9ms) and off codes (2.24ms) only.
To avoid mistakes made by keyboard scanning or simul-
taneous two-key inputs (except for the three double-key
active functions (K21+K22, K21+K23, and K21+K24),
the devices are facilitated with 36ms starting time.
The HT6221A/HT6221B/HT6222A also provide three
double-key active functions (K21+K22, K21+K23, and
K21+K24) for tape deck recording operations. The dou-
ble-key operation rules are shown in timing 4 and timing
6.
Transmission Codes
The transmission codes of the devices consist of a 9ms
header code, a 4.5ms off code, 16-bit address codes
(18ms~36ms), 9ms~18ms 8-bit data codes, and the in-
verse code of the 8-bit data codes. The following is an il-
lustration of the transmission codes.
K e y - in
(K 1 ~ K 6 4 )
IR C
DOUT
3 6 m s m in .
K e y E n a b le s
F osc=455kH z
4 .5 m s
0 .5 6 m s
38kH z,
3 3 % d u ty c a r r ie r
45m s~63m s
9 m s (A 0 ~ A 1 5 + D 0 ~ D 7 + D 0 ~ D 7 ) 9 m s
2 .2 4 m s
108m s
108m s
Timing 1. Output Format for the DOUT
0 .5 6 m s
9m s
2 .2 4 m s
Rev. 1.10
4
June 1, 2010
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