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參數資料
| 型號： | UBA2051C |
| 廠商： | NXP Semiconductors N.V. |
| 英文描述： | One-chip telephone ICs with speech, dialler and ringer functions |
| 中文描述： | 一個有語言，撥號及振鈴電話集成電路芯片的功能 |
| 文件頁數： | 23/52頁 |
| 文件大小： | 292K |
| 代理商： | UBA2051C |
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2000 May 19
23
Philips Semiconductors
Product specification
One-chip telephone ICs with speech,
dialler and ringer functions
UBA2050(A); UBA2051(A;C)
K
EYBOARD DETECTOR
(
PINS
C1
TO
C4
AND
R1
TO
R4)
The pins are directly connected to a traditional single
contact keyboard. The keyboard is normally static with
outputs R1 to R4 at LOW level and inputs C1 to C4 with
internal pull-up resistors. When any key is pressed,
scanning is done to detect which key has been pressed.
A second key entry will be valid after having released the
first key entry. Simultaneously pressing several keys will
result in no action.
A key entry becomes valid when the depress debounce
time t
dd
has elapsed (see Fig.24). After the release of a
valid key, the scanning is frozen when the release
debounce time t
rd
has elapsed.
The pins R1 to R4 are LOW and pull-down resistors
replace pull-up resistors at pins C1 to C4 when
V
DD
< V
POR
.
handbook, full pagewidth
MGM341
key entry
tdd
key valid
trd
Fig.24 Timing diagram debouncing.
t
dd
= depress debounce time.
t
rd
= release debounce time.
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