參數(shù)資料
型號(hào): SH2165-FGT
元件分類(lèi): 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): 24/33頁(yè)
文件大小: 354K
代理商: SH2165-FGT
SH2165
CIRCUIT NOTES (CONT’D)
Copyright 1999-2005 Semtech Corporation
SH2165 data sheet v1.08 (2005-05-17)
www.semtech.com
30
Oscillation circuit
A quartz crystal, (<= 2500 ppm with 33 pF load capacitors) is recommended. A ceramic resonator (<= 2500 ppm)
with built-in load capacitors can also be used.
Key strike simulation
Some applications require another controller to control the key strike to generate key-press and key-release signals.
Semtech recommends the design below. Do NOT use MOSFETs and PNP transistors in the design.
KEY_CTRL2
KEY_CTRL0
R7
KEY_CTRL1
C5
R6
C4
Q1
NPN
Q3
NPN
Q2
NPN
R3
10K
R1
10K
R2
10K
KEY_CTRL high: key press
KEY_CTRL low:
key release
Pulse width should be at least 35 ms for good, stable results.
MOSFETs and PNP transistors can NOT be used.
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