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參數(shù)資料
| 型號(hào)： | MTU429B |
| 廠商： | Electronic Theatre Controls, Inc. |
| 英文描述： | 4-Bit Micro-Controller with LCD Dr |
| 中文描述： | 4位微控制器與LCD博士 |
| 文件頁數(shù)： | 20/20頁 |
| 文件大?。?/td> | 173K |
| 代理商： | MTU429B |
20/20
MTU429B Revision 3.0 28/Oct/1999
MTU429B
(Preliminary)
MYSON
TECHNOLOGY
F.
Lower current consumption and reliability:
The chip’s reliability will greatly decrease if invalid use BCF, especially for Li-battery mode. Because the
chip’s internal power also switches between VDD1 and VDD2, which also cause a temporary power
noise.
9.4 Input pin
Any input pins floating will cause chips in malfunction and large current consumption.
9.5 32.768KHz X’tal oscillator
Always layout the X’al as close the Chips as possible and don’ place any signals across the layout routing.
Since X’al oscillation circuit consumes current only 0.5uA to 1uA, any power noise will disturb the oscillation.
The proper external capacitors for Xin and Xout are necessary for the accuracy and stability of oscillation.
1/( Cin+Cpcb ) + 1/( Cout+Cpcb ) = 1/CL
The Chip’s Xout pin has an internal capacitor around 10~20pf connected to BAK (chip’s internal Node).
For example
Epson’s C-001R 20ppm, CL=12.5pf
Cin = 25pf
Cout = 15pf
The time accuracy will be around +/- 0.5 second/day
Note: The parasitic capacitors of X’al pins in PCB layout need be considered in above calculation.
9.6 RFC / Event counter / IOA for MTU429B
If anyone uses RFC / Event counter function and IOAs in the same application, make sure the pin IOA1
(which is corresponding to CX by mask option) must set as IOA’s output mode by SPA instruction. Or the
signal changes on CX pin may cause halt release or interrupt for IOA’s port. In this case the program couldn’
function properly.
Myson Technology, Inc.
No. 2, Industry E. Rd. III, Science-Based Industrial Park, Hsinchu, Taiwan, R. O. C.
Tel: +886-3-5784866 Fax: +886-3-5785002 http://www.myson.com.tw
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