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参数资料
| 型号： | MC14489B |
| 厂商： | 飞思卡尔半导体(中国)有限公司 |
| 英文描述： | Multi-Character LED Display/Lamp Driver(多字符LED显示/ 指示灯驱动器) |
| 中文描述： | 多字符LED显示/灯驱动器（多字符LED显示/指示灯驱动器） |
| 文件页数： | 7/22页 |
| 文件大小： | 2258K |
| 代理商： | MC14489B |
MC14489B
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 con-
trol up to 5 lamps dependently. (See Figure 17.) For lamps,
the No Decodemode is selected via the configuration regis-
ter, 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. Refer to Figure 9. If unused, h must be left
open.
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 reduc-
ing the VDD current, IDD.
Figure 7. a through h Nominal Current per Output versus Rx
35
30
25
20
15
10
5
400
800
1.2 k
2.0 k
2.4 k 2.8 k
3.2 k
3.6 k
4.0 k
1.6 k
i
5 V SUPPLY
BIT D23 = HIGH (BRIGHTEN LEDs)
WITH D23 = LOW, iOH IS CUT BY
～
50%.
Rx, EXTERNAL RESISTOR (
)
NOTE: Drive current tolerance is approximately
±
15%.
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相关代理商/技术参数 |
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|---|---|
| MC14489BDW | 功能描述:IC DRIVER LED/LAMP 5CH 20-SOIC RoHS:否 类别:集成电路 (IC) >> PMIC - 显示器驱动器 系列:- 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:2,500 系列:- 显示器类型:真空荧光 (VF) 配置:5 x 7（矩阵） 接口:串行 数字或字符:- 电流 - 电源:3.5mA 电源电压:2.7 V ~ 3.6 V 工作温度:-40°C ~ 125°C 安装类型:表面贴装 封装/外壳:16-SSOP（0.154"，3.90mm 宽） 供应商设备封装:16-QSOP 包装:带卷 (TR) |
| MC14489BDWE | 功能描述:LED显示驱动器 5 CHANNEL LED DRIVER RoHS:否 制造商:Micrel 数位数量:5 片段数量: 安装风格:SMD/SMT 封装 / 箱体:PLCC-44 工作电源电压:4.75 V to 11 V 最大电源电流:10 mA 最大工作温度:+ 85 C 最小工作温度:- 40 C 封装:Tube |
| MC14489BDWER2 | 功能描述:LED显示驱动器 5 CHANNEL LED DRIVER RoHS:否 制造商:Micrel 数位数量:5 片段数量: 安装风格:SMD/SMT 封装 / 箱体:PLCC-44 工作电源电压:4.75 V to 11 V 最大电源电流:10 mA 最大工作温度:+ 85 C 最小工作温度:- 40 C 封装:Tube |
| MC14489BDWER2-CUT TAPE | 制造商:Freescale 功能描述:MC14489 Series 5.5 V 5 Channel Multi Character Led Display/Lamp Driver SOIC-20 |
| MC14489BDWR2 | 功能描述:IC DRIVER LED/LAMP 5CH 20-SOIC RoHS:否 类别:集成电路 (IC) >> PMIC - 显示器驱动器 系列:- 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:2,500 系列:- 显示器类型:真空荧光 (VF) 配置:5 x 7（矩阵） 接口:串行 数字或字符:- 电流 - 电源:3.5mA 电源电压:2.7 V ~ 3.6 V 工作温度:-40°C ~ 125°C 安装类型:表面贴装 封装/外壳:16-SSOP（0.154"，3.90mm 宽） 供应商设备封装:16-QSOP 包装:带卷 (TR) |
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