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ICM7211AM

更新时间： 2024-01-18 08:33:30
品牌 Logo 应用领域
英特矽尔 - INTERSIL 驱动
页数 文件大小 规格书
7页 254K
描述
4-Digit, LCD Display Driver

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ICM7211AM 技术参数

是否无铅：含铅是否Rohs认证：不符合
生命周期：Obsolete零件包装代码：LCC
包装说明：PLASTIC, LCC-44针数：44
Reach Compliance Code：not_compliantECCN代码：EAR99
HTS代码：8542.39.00.01风险等级：5.63
Is Samacsys：N数据输入模式：PARALLEL
显示模式：SEGMENT接口集成电路类型：LIQUID CRYSTAL DISPLAY DRIVER
JESD-30 代码：S-PQCC-J44JESD-609代码：e0
长度：16.585 mm复用显示功能：NO
底板数：1-BP位数/字符：4-DIGIT
功能数量：1区段数：7
端子数量：44最高工作温度：85 °C
最低工作温度：-20 °C封装主体材料：PLASTIC/EPOXY
封装代码：QCCJ封装等效代码：LDCC44,.7SQ
封装形状：SQUARE封装形式：CHIP CARRIER
峰值回流温度（摄氏度）：NOT SPECIFIED电源：5 V
认证状态：Not Qualified座面最大高度：4.57 mm
子类别：Other Interface ICs最大压摆率：0.05 mA
最大供电电压：6 V最小供电电压：3 V
标称供电电压：5 V表面贴装：YES
技术：CMOS温度等级：OTHER
端子面层：Tin/Lead (Sn/Pb)端子形式：J BEND
端子节距：1.27 mm端子位置：QUAD
处于峰值回流温度下的最长时间：NOT SPECIFIED宽度：16.585 mm
Base Number Matches：1

ICM7211AM 数据手册

 浏览型号ICM7211AM的Datasheet PDF文件第1页浏览型号ICM7211AM的Datasheet PDF文件第2页浏览型号ICM7211AM的Datasheet PDF文件第3页浏览型号ICM7211AM的Datasheet PDF文件第4页浏览型号ICM7211AM的Datasheet PDF文件第6页浏览型号ICM7211AM的Datasheet PDF文件第7页 
ICM7211AM  
Another technique for overdriving the oscillator (with a signal  
Des cription Of Operation  
swinging the full supply) is to skew the duty cycle of the  
overdriving signal such that the negative portion has a duration  
shorter than about one microsecond. The backplane disable  
sensing circuit will not respond to signals of this duration.  
Device  
The ICM7211AM provides outputs suitable for driving  
conventional four-digit, seven-segment LCD displays. These  
devices include 28 individual segment drivers, backplane  
driver, and a self-contained oscillator and divider chain to  
generate the backplane frequency.  
OSCILLATOR  
FREQUENCY  
128 CYCLES  
BACKPLANE  
The segment and backplane drivers each consist of a  
CMOS inverter, with the N-Channel and P-Channel devices  
ratioed to provide identical on resistances, and thus equal  
rise and fall times. This eliminates any DC component, which  
could arise from differing rise and fall times, and ensures  
maximum display life.  
INPUT/OUTPUT  
64 CYCLES  
64 CYCLES  
OFF  
SEGMENTS  
ON  
SEGMENTS  
The backplane output devices can be disabled by  
FIGURE 4. DISPLAY WAVEFORMS  
connecting the OSCillator input (pin 36) to V . This allows  
SS  
the 28 segment outputs to be synchronized directly to a  
signal input at the BP terminal (pin 5). In this manner,  
several slave devices may be cascaded to the backplane  
output of one master device, or the backplane may be  
derived from an external source. This allows the use of  
displays with characters in multiples of four and a single  
backplane. A slave device represents a load of  
approximately 200pF (comparable to one additional  
segment). Thus the limitation of the number of devices that  
can be slaved to one master device backplane driver is the  
additional load represented by the larger backplane of  
displays of more than four digits. A good rule of thumb to  
observe in order to minimize power consumption is to keep  
the backplane rise and fall times less than about 5µs. The  
backplane output driver should handle the backplane to a  
display of 16 one-half inch characters. It is recommended, if  
more than four devices are to be slaved together, the  
backplane signal be derived externally and all the  
Input Configurations and Output Codes  
The ICM7211AM accepts a four-bit true binary (i.e., positive  
level = logical one) input at pins 27 thru 30, least significant  
bit at pin 27 ascending to the most significant bit at pin 30. It  
decodes the binary input into seven-segment alphanumeric  
“Code B” output, i.e., 0-9, dash, E, H, L, P, blank. These  
codes are shown explicitly in Table 1. It will correctly decode  
true BCD to a seven-segment decimal output.  
TABLE 1. OUTPUT CODES  
BlNARY  
CODE B  
ICM7211AM  
B3  
0
0
0
0
0
0
0
0
1
1
1
1
B2  
0
0
0
0
1
1
1
1
0
0
0
0
B1  
0
0
1
1
0
0
1
1
0
0
1
1
BO  
0
1
ICM7211AM devices be slaved to it. This external signal  
should be capable of driving very large capacitive loads with  
short (1 - 2µs) rise and fall times. The maximum frequency  
for a backplane signal should be about 150Hz although this  
may be too fast for optimum display response at lower  
display temperatures, depending on the display type.  
0
1
0
The onboard oscillator is designed to free run at  
1
approximately 19kHz at microampere current levels. The  
oscillator frequency is divided by 128 to provide the  
backplane frequency, which will be approximately 150Hz  
with the oscillator free-running; the oscillator frequency may  
be reduced by connecting an external capacitor between the  
0
1
OSCillator terminal and V  
.
DD  
0
The oscillator may also be overdriven if desired, although care  
must be taken to ensure that the backplane driver is not  
disabled during the negative portion of the overdriving signal  
(which could cause a DC component to the display). This can  
be done by driving the OSCillator input between the positive  
supply and a level out of the range where the backplane disable  
1
0
1
is sensed (about one fifth of the supply voltage above V ).  
SS  
FN3158.5  
November 16, 2004  
5
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