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參數(shù)資料
| 型號： | 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)： | 19/20頁 |
| 文件大?。?/td> | 173K |
| 代理商： | MTU429B |
19/20
MTU429B Revision 3.0 28/Oct/1999
MTU429B
(Preliminary)
MYSON
TECHNOLOGY
9.0 APPENDIX ( Important Issue for MTU419/419B/428/429B )
9.1 Chip’s internal vlotage V.S. power mode and external connection
Note *1: VDD3 is only used for LCD operating in 1/3 bias and 1/4 bias. If 1/2 bias chosen, VDD3 need be
connected to VDD2 (VDD3 is equal to VDD2).
*2: VDD4 is only used for LCD operating in 1/4 bias. If 1/3 bias chosen, VDD4 need be connected to
VDD3 (VDD4 is equal to VDD3). If 1/2 bias chosen, VDD4 need be connected to VDD2 (VDD4 is
equal to VDD2).
*3: BAK is defined as chip’s internal power supply node, which is used only for internal logic circuitry.
A.
Whatever the power mode used, all external VDD# pins must connect a capacitor (0.05uF or 0.1uF) to
GND for decoupling power noise using.
B.
All VDD# pins other than Vsupply are from voltage charge pump, i.e. If no clock, then VDD# pins can not
supply out.
C.
Vsupply is the power supply for Chip and depends on the power mode used, all the input and output pins
voltage range follow the Vsupply.
9.2 The capacitor connected between CUP2 and CUP3 is only when MTU429B operating in 1/4 bias.
9.3 Some notes for BCF flag
BCF is always set to “High” automatically after Power on, Reset and Stop mode.
A.
For power saving use, BCF may be set to “Low” which can reduce chip’s current consumption.
B.
Ag and Li battery mode applications:
After Power on, Reset or release from Stop mode. Need to wait 2 seconds long, then can set BCF to
“Low”.
C.
Larger current load and fast clock:
a. BCF should be set to “High” for the case of fast clock or larger current load (such as RFC, ADC, DAC,
EL-light and Buzzer output) use.
b. After set BCF to “high”, need wait 2 ms long at least, then can enable larger current load. Or after
disable Larger current load, need wait 2ms long at least, then can set BCF to “Low”
D.
Li battery mode applications:
Especially for Li battery mode, BCF switching will cause a temporary current surge (or power noise)
on BAK. Furthermore if not necessary, don’ switch BCF too often as possible.
E.
Improperly use of BCF will cause malfunction to chips.
AG
Vsupply
2 x VDD1
3 x VDD1
4 x VDD1
VDD1
LI
1/2 x Vsupply
Vsupply
3/2 x Vsupply
2 x Vsupply
BCF = 0 BCF=1
VDD1
EXT-V
1/2 x Vsupply
Vsupply
3/2 x Vsupply
2 x Vsupply
VDD2
VDD1
VDD2
VDD3
*1
VDD4
*2
BAK
*3
VDD2
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