參數(shù)資料
型號(hào)： 935260607118
廠商： NXP SEMICONDUCTORS
元件分類： 無(wú)繩電話/電話
英文描述： TELEPHONE MULTIFUNCTION CKT, PDSO28
封裝： PLASTIC, SOT-136, SO-28
文件頁(yè)數(shù)： 16/56頁(yè)
文件大?。?/td> 360K
代理商： 935260607118
2000 May 19
23
Philips Semiconductors
Product specication
One-chip telephone ICs with speech,
dialler and ringer functions
UBA2050(A); UBA2051(A;C)
KEYBOARD 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 tdd has elapsed (see Fig.24). After the release of a
valid key, the scanning is frozen when the release
debounce time trd has elapsed.
The pins R1 to R4 are LOW and pull-down resistors
replace pull-up resistors at pins C1 to C4 when
VDD <VPOR.
handbook, full pagewidth
MGM341
key entry
tdd
key valid
trd
Fig.24 Timing diagram debouncing.
tdd = depress debounce time.
trd = release debounce time.
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