參數(shù)資料
型號： FTF1100MF1
廠商： INFINEON TECHNOLOGIES AG
元件分類： 模擬信號調(diào)理
英文描述： SPECIALTY ANALOG CIRCUIT, XMA
文件頁數(shù)： 13/39頁
文件大?。?/td> 400K
代理商： FTF1100MF1
FingerTIP
Infineon Technologies
20/38
FTF 1100 MF1 V2.0 databook 3.3 (05.00)
3.10 Recommended Electrical Connection of the FingerTIP in EPP Mode
21 Protec. GND
20 Vcc
19 GND
18 NC
17 NC
16 D7
15 D6
14 D5
13 D4
12 D3
11 D2
10 D1
9 D0
8 NC
7 NC
6 READY
5 /REQUEST
4 /RESET
3 EPP/SPI
2 GND
1 Protec. GND
Vcc
INIT
BUSY
8
AutoLF
Molex-FFC/FPC
R2 (e.g. 33
)
R3 (e.g. 33
)
2/8 74XX245
Notice:
Place the resistors close to the outputs of the drivers
Place the drivers close to the outputs of the handshake/data lines
(if using a DB25 connector place the drivers into the connector)
shielded cable
DB25 / PC
1
13
25
14
GND
max 1.5 m
Connect pin 1 and 21 to protective ground
Protective GND
R1 (e.g. 33
)
10F
GND
R4 (
≥ 22)
10F
R7 (e.g. 33
)
1/8 74XX245
R8 - R15 (e.g. 33
)
8/8 74XX245
R5 - R6 (e.g. 1K
)
2/8 74XX245
EN
GND
R16 (
≥ 15K)
(22K
) R16
Figure 11: Recommended circuit for interfacing the FingerTIP to an EPP Printer Port
The recommended circuit consists of 3 parts. The first consists of the drivers and resistors
between the DB-25 connector and the cable. The drivers are required to buffer the RESET
(AutoLF) and REQUEST (Init) handshake lines in the case of weak PC output drivers. This
is done to compensate for any potential PC signal issues. The serial resistors after the
drivers are required to reduce signal ringing. The value of these resistors is dependent on
the drivers used, but typical values are 33Ohm.
The second part is the cable. For a proper data transfer the cable must be shielded, and
the maximum length should be less than 1.5 meters. To guarantee clean signal quality it is
recommended to use several ground path wires to the PC chassis. On the sensor side of
the cable, the shield must be connected to pin 1 and 21 (protective ground) with a
dedicated line. Never connect the signal ground to protective ground on sensor side. This
connection configuration of the shield is required for optimal ESD protection.
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