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PDF ICM7211AM Data sheet ( Hoja de datos )
| Número de pieza | ICM7211AM | |
| Descripción | 4-Digit LCD Display Driver | |
| Fabricantes | Intersil Corporation | |
| Logotipo |  |
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®
Data Sheet
November 16, 2004
ICM7211AM
FN3158.5
4-Digit, LCD Display Driver
The ICM7211AM device is a non-multiplexed four-digit
seven-segment CMOS LCD display decoder-driver.
This device is configured to drive conventional LCD displays
by providing a complete RC oscillator, divider chain,
backplane driver, and 28 segment outputs.
It also has a microprocessor compatible input configuration,
which provides data input latches and Digit Address latches
under control of high-speed Chip Select inputs. These devices
simplify the task of implementing a cost-effective
alphanumeric seven-segment display for microprocessor
systems, without requiring extensive ROM or CPU time for
decoding and display updating.
The ICM7211AM provides the “Code B” output code, i.e.,
0-9, dash, E, H, L, P, blank, but will correctly decode true
BCD to seven-segment decimal outputs.
Features
• Four Digit Non-Multiplexed 7 Segment LCD Display
Outputs with Backplane Driver
• Complete Onboard RC Oscillator to Generate Backplane
Frequency
• Backplane Input/Output Allows Simple Synchronization of
Slave-Devices to a Master
• Provides Data and Digit Address Latches Controlled by
Chip Select Inputs to Provide a Direct High Speed
Processor Interface
• Decodes Binary to Code B (0-9, Dash, E, H, L, P, Blank)
Ordering Information
PART NUMBER
ICM7211AMlPL
DISPLAY
TYPE
DISPLAY
DECODING
LCD Code B
INPUT
DISPLAY DRIVE
INTERFACING
TYPE
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Microprocessor
Direct Drive
TEMP.
RANGE (°C)
PACKAGE
-40 to 85 40 Ld PDIP
PKG. DWG. #
E40.6
DataShee
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1
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
1-888-INTERSIL or 321-724-7143 | Intersil (and design) is a registered trademark of Intersil Americas Inc.
Copyright Intersil Americas Inc. 2001, 2004. All Rights Reserved
All other trademarks mentioned are the property of their respective owners.
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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
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.
driver, and a self-contained oscillator and divider chain to
OSCILLATOR
generate the backplane frequency.
FREQUENCY
128 CYCLES
The segment and backplane drivers each consist of a
CMOS inverter, with the N-Channel and P-Channel devices
BACKPLANE
INPUT/OUTPUT
64 CYCLES
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
OFF
SEGMENTS
64 CYCLES
maximum display life.
ON
SEGMENTS
The backplane output devices can be disabled by
connecting the OSCillator input (pin 36) to VSS. 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
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segment). Thus the limitation of the number of devices that
can be slaved to one master device backplane driver is the
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.
additional load represented by the larger backplane of
displays of more than four digits. A good rule of thumb DtoataSheet4U.com
observe in order to minimize power consumption is to keep
TABLE 1. OUTPUT CODES
BlNARY
the backplane rise and fall times less than about 5µs. The
backplane output driver should handle the backplane to a
B3 B2 B1 BO
CODE B
ICM7211AM
display of 16 one-half inch characters. It is recommended, if
more than four devices are to be slaved together, the
0000
backplane signal be derived externally and all the
ICM7211AM devices be slaved to it. This external signal
0001
should be capable of driving very large capacitive loads with
short (1 - 2µs) rise and fall times. The maximum frequency
0010
for a backplane signal should be about 150Hz although this
may be too fast for optimum display response at lower
0011
display temperatures, depending on the display type.
0100
The onboard oscillator is designed to free run at
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
OSCillator terminal and VDD.
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
is sensed (about one fifth of the supply voltage above VSS).
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0101
0110
0111
1000
1001
1010
1011
DataShee
5 FN3158.5
November 16, 2004
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