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U3750BM 参数 Datasheet PDF下载

U3750BM图片预览
型号: U3750BM
PDF下载: 下载PDF文件 查看货源
内容描述: 单芯片电话线路 [One Chip Telephone Circuit]
分类和应用: 电信电路电话电路
文件页数/大小: 20 页 / 206 K
品牌: TEMIC [ TEMIC SEMICONDUCTORS ]
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U3750BM  
TELEFUNKEN Semiconductors  
Timing of a Push Button  
The information from a pressed push button or released push button is taken into account if it is still present during  
at least two sampling times, T7.  
Table 3 Timing of a push button  
Clock Keyboard 2 ms, 2.2 ms  
Minimum time – push button on  
Min.  
14  
15.4  
Typ.  
24  
26.4  
Max.  
34  
37.4  
Unit  
ms  
ms  
Minimum time – push button off  
24  
26.4  
24  
26.4  
34  
37.4  
ms  
ms  
The entries are debounced on both the leading and trailing edges for 34 ms or 37.4 ms according to the value of the  
keyboard clock, and so the time remains less than 40 ms. At this time the information can be processed. If the informa-  
tion is still present after more than 40 ms, it is only taken one time.  
Serial Bus  
The remote microcontroller is connected to the IC by 4 pins: C2, C3, C4, C5 (see figure 10).  
Figure 10 Connection of the microcontroller to the U3750BM  
C2 transmits the data, C3 the clock, C4 the enable signal, and C5 indicates the state of the dialer:  
C5 = 0, dialer is busy  
C5 = 1, dialer is free  
Data is serially shifted in a 5-bit register during the positive going transition of the clock pulse. The positive going  
transition of the enable signal validates the transmission.  
14 (20)  
Rev. A1: 16.07.1996