參數(shù)資料
型號(hào)： UBA2051A
廠(chǎng)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(gè)有語(yǔ)言，撥號(hào)及振鈴電話(huà)集成電路芯片的功能
文件頁(yè)數(shù)： 23/52頁(yè)
文件大?。?/td> 292K
代理商： UBA2051A
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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PDF描述
UBA2051AT One-chip telephone ICs with speech, dialler and ringer functions
UBA2051C One-chip telephone ICs with speech, dialler and ringer functions
UBA2051CT One-chip telephone ICs with speech, dialler and ringer functions
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
UBA2051AT 制造商:PHILIPS 制造商全稱(chēng):NXP Semiconductors 功能描述:One-chip telephone ICs with speech, dialler and ringer functions
UBA2051C 制造商:PHILIPS 制造商全稱(chēng):NXP Semiconductors 功能描述:One-chip telephone ICs with speech, dialler and ringer functions
UBA2051CT 制造商:PHILIPS 制造商全稱(chēng):NXP Semiconductors 功能描述:One-chip telephone ICs with speech, dialler and ringer functions
UBA2051T 制造商:PHILIPS 制造商全稱(chēng):NXP Semiconductors 功能描述:One-chip telephone ICs with speech, dialler and ringer functions
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