参数资料
| 型号： | ICM7211AMIPL |
| 厂商： | Intersil |
| 文件页数： | 6/8页 |
| 文件大小： | 0K |
| 描述： | IC LCD DISPLAY DRVR 4DGT 40-DIP |
| 标准包装： | 99 |
| 显示器类型： | LCD |
| 配置： | 7 段显示 |
| 数字或字符： | 4 位数字 |
| 电流 - 电源： | 10µA |
| 电源电压： | 3 V ~ 6 V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 通孔 |
| 封装/外壳： | 40-DIP（0.600"，15.24mm） |
| 供应商设备封装： | 40-DIP |
| 包装： | 管件 |
| 其它名称： | ICM7211AMIPLIS |
ICM7211AM
Description of Operation
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.
Another technique for overdriving the oscillator (with a signal
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.
OSCILLATOR
FREQUENCY
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
BACKPLANE
INPUT/OUTPUT
OFF
SEGMENTS
128 CYCLES
64 CYCLES
64 CYCLES
maximum display life.
The backplane output devices can be disabled by
connecting the OSCillator input (pin 36) to V SS . This allows
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
ON
SEGMENTS
FIGURE 4. DISPLAY WAVEFORMS
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
observe in order to minimize power consumption is to keep
the backplane rise and fall times less than about 5 μ s. The
B3
B2
B1
BO
CODE B
ICM7211AM
backplane output driver should handle the backplane to a
display of 16 one-half inch characters. It is recommended, if
0
0
0
0
more than four devices are to be slaved together, the
backplane signal be derived externally and all the
0
0
0
1
ICM7211AM devices be slaved to it. This external signal
should be capable of driving very large capacitive loads with
0
0
1
0
short (1 - 2 μ s) rise and fall times. The maximum frequency
for a backplane signal should be about 150Hz although this
0
0
1
1
may be too fast for optimum display response at lower
display temperatures, depending on the display type.
The onboard oscillator is designed to free run at
0
0
1
1
0
0
0
1
approximately 19kHz at microampere current levels. The
oscillator frequency is divided by 128 to provide the
0
1
1
0
backplane frequency, which will be approximately 150Hz
with the oscillator free-running; the oscillator frequency may
0
1
1
1
be reduced by connecting an external capacitor between the
OSCillator terminal and V DD .
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
1
1
1
0
0
0
0
0
1
0
1
0
(which could cause a DC component to the display). This can
be done by driving the OSCillator input between the positive
1
0
1
1
supply and a level out of the range where the backplane disable
is sensed (about one fifth of the supply voltage above V SS ).
6
FN3158.7
April 17, 2006
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相关代理商/技术参数 |
参数描述 |
|---|---|
| ICM7211AMIPL WAF | 制造商:Harris Corporation 功能描述: |
| ICM7211AMIPL | 制造商:Intersil Corporation 功能描述:4 DIGIT LCD DISPLAY DRIVER 4 BIT |
| ICM7211AMIPL+ | 功能描述:LCD 驱动器 Four Digit Display Decoder/Driver RoHS:否 制造商:Maxim Integrated 数位数量:4.5 片段数量:30 最大时钟频率:19 KHz 工作电源电压:3 V to 3.6 V 最大工作温度:+ 85 C 最小工作温度:- 20 C 封装 / 箱体:PDIP-40 封装:Tube |
| ICM7211AMIPLZ | 功能描述:LCD 驱动器 W/ANNEAL DISPLAY 4 DIGLCDDRVR40PDIPIND RoHS:否 制造商:Maxim Integrated 数位数量:4.5 片段数量:30 最大时钟频率:19 KHz 工作电源电压:3 V to 3.6 V 最大工作温度:+ 85 C 最小工作温度:- 20 C 封装 / 箱体:PDIP-40 封装:Tube |
| ICM7211AMIQ | 制造商:未知厂家 制造商全称:未知厂家 功能描述:LCD Display Driver |
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