參數(shù)資料
型號(hào)： SH2165-FGT
元件分類： 微控制器/微處理器
英文描述： SPECIALTY MICROPROCESSOR CIRCUIT, PQFP64
封裝： 10 X 10 MM, 0.50 MM PITCH, ROHS COMPLIANT, LQFP-64
文件頁(yè)數(shù)： 22/33頁(yè)
文件大?。?/td> 354K
代理商： SH2165-FGT
SH2165
CIRCUIT NOTES
Copyright 1999-2005 Semtech Corporation
SH2165 data sheet v1.08 (2005-05-17)
www.semtech.com
29
Power Circuit
THe SH2165 reference design uses the SC1453 3.3 V LDO regulator, which is recommended. Any low-noise LDO
regulator with output voltage 3.0 V to 3.6 V can be used.
Operational amplifier
Only the LMV321 from Fairchild, National Semiconductor, and Texas Instruments have been tested and approved.
Integration circuit
The integration capacitor is 220 pF. A greater capacitance would reduce X, Y, Z axis sampling gain. The capacitor
can be used to adjust XY speed and Z senitivity. Z sensitivity can also be adjusted by itself by changing the value of
R19.
Backlight circuit
If no backlight is used, leave the backlight control pins (BKLTON and BKLT50, pins 51 and 52) floating.
USB interface circuit
When the SH2165 is used in a hot-pluggable environment, we recommend the use of an ESD protection chip like
Semtech’s STF203-33 for the USB interface, as shown in the evaluation board schematic.
When the SH2165 is built in to a product, and ESD protection for the USB port is not necessary, the customer can
omit the protection chip and use resistors and capacitors instead, as shown in the diagram below.
D-
D+
GND
VCC
GND
C22
68 pF
U2
SH2165-FGT
D-
26
D+
25
TrON
24
R37
1.5 K
R35
27
R36
27
C21
68 pF
J7
TO SYSTEM
1
2
3
4
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