參數(shù)資料
型號(hào)： MC14489DW
廠商： MOTOROLA INC
元件分類： 顯示驅(qū)動(dòng)器
英文描述： Digital Signal Processor 181-CPGA -55 to 125
中文描述： LED DISPLAY DRIVER, PDSO20
封裝： SOP-20
文件頁(yè)數(shù)： 7/20頁(yè)
文件大?。?/td> 303K
代理商： MC14489DW
MC14489
MOTOROLA
7
a through h (Pins 1, 2, 4 – 7, 19, 20)
Anode–Driver Current Sources. These outputs are close-
ly–matched current sources which directly tie to the anodes
of external discrete LEDs (lamps) or display segment LEDs.
Each output is capable of sourcing up to 35 mA.
When used with lamps, outputs a, b, c, and d are used to
independently control up to 20 lamps. Output h is used to
control up to 5 lamps dependently. (See Figure 17.) For
lamps, the
No Decode
mode is selected via the configuration
register, forcing e, f, and g inactive (low).
When used with segmented displays, outputs a through g
drive segments a through g, respectively. Output h is used to
drive the decimals. If unused, h must be left open. Refer to
Figure 10.
Bank 1 through Bank 5 (Pins 9, 13, 15, 16, 17)
Diode–Bank FET Switches. These outputs are low–resis-
tance switches to ground (VSS) capable of handling currents
of up to 320 mA each. These pins directly tie to the common
cathodes of segmented displays or the cathodes of lamps
(wired with cathodes common).
The display is refreshed at a nominal 1 kHz rate to achieve
optimum brightness from the LEDs. A 20% duty cycle is uti-
lized.
Special design techniques are used on–chip to accommo-
date the high currents with low EMI (electromagnetic interfer-
ence) and minimal spiking on the power lines.
POWER SUPPLY
VSS (Pin 14)
Most–negative supply potential. This pin is usually ground.
Resistor Rx is externally tied to ground (VSS). Therefore,
the chip’s VSS pin does not contain the Rx current compo-
nent.
VDD (Pin 13)
Most–positive supply potential.
To guarantee data integrity in the registers and to ensure
the serial interface is functional, this voltage may range from
3 to 6 volts with respect to VSS. For example, within this volt-
age range, the chip could be placed in and out of the low–
power mode.
To adequately drive the LEDs, this voltage must be 4.5 to
6 volts with respect to VSS.
The VDD pin contains the Rx current component plus the
chip’s current drain. In the low–power mode, the current mir-
ror and clock oscillator are turned off, thus significantly re-
ducing the VDD current, IDD.
相關(guān)PDF資料
PDF描述
MC14489P Digital Signal Processor 181-CPGA -55 to 125
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
MC14489P 制造商:Motorola Inc 功能描述:
MC14490DW 功能描述:算數(shù)邏輯單元 - ALU LOG CMOS 3-18V HEX BOUNCE ELIMINATOR RoHS:否 制造商:ON Semiconductor 高電平輸出電流: 低電平輸出電流: 傳播延遲時(shí)間: 電源電壓-最大:18 V 電源電壓-最小:3 V 封裝 / 箱體:SOIC-16 Wide 最大工作溫度:+ 125 C 封裝:Reel
MC14490DWG 功能描述:算數(shù)邏輯單元 - ALU LOG CMOS 3-18V HEX BOUNCE ELIMINATOR RoHS:否 制造商:ON Semiconductor 高電平輸出電流: 低電平輸出電流: 傳播延遲時(shí)間: 電源電壓-最大:18 V 電源電壓-最小:3 V 封裝 / 箱體:SOIC-16 Wide 最大工作溫度:+ 125 C 封裝:Reel
MC14490DWG 制造商:ON Semiconductor 功能描述:Gate / Inverter Logic IC Package/Case:16
MC14490DWR2 功能描述:算數(shù)邏輯單元 - ALU LOG CMOS 3-18V HEX BOUNCE ELIMINATOR RoHS:否 制造商:ON Semiconductor 高電平輸出電流: 低電平輸出電流: 傳播延遲時(shí)間: 電源電壓-最大:18 V 電源電壓-最小:3 V 封裝 / 箱體:SOIC-16 Wide 最大工作溫度:+ 125 C 封裝:Reel
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