7228AIBIZ データシートの表示（PDF） - Intersil
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7228AIBIZ Datasheet PDF : 18 Pages
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ICM7228
VDD
VDD
1K
VDD
1.4APEAK
2N6034
100Ω
SEGMENT
OUTPUT
ICM7228B
VDD
300Ω
DIGIT
OUTPUT
N
≈15Ω
1K 25Ω
(100mAPEAK)
2N2219
1K
Power Supply Bypassing
Connect a minimum of 47µF in parallel with 0.1µF capacitors
between VDD and VSS of ICM7228. These capacitors
should be placed in close proximity to the device to reduce
the power supply ripple caused by the multiplexed LED
display drive current pulses.
VSS
VSS
FIGURE 16. DRIVING HIGH CURRENT DISPLAY, COMMON
CATHODE ICM7228B TO COMMON ANODE
DISPLAY
Three Level Input, ICM7228C
As mentioned before, pin 9 is a three level input and controls
three functions: Hexadecimal display decoding, Code B
display decoding and shutdown mode. In many applications,
pin 9 will be left open or permanently wired to one state. When
pin 9 can not be permanently left in one state, the circuits
illustrated in Figure 17 can be used to drive this three level
input.
HIGH = HEX
LOW = SHUTDOWN
74C126 THREE-STATE BUFFER
PIN 9
HIGH = HEX OR SHUTDOWN
LOW = CODE B
HIGH = HEX
LOW = SHUTDOWN
HIGH = HEX OR SHUTDOWN
LOW = CODE B
HIGH = CODE B
LOW = HEX
CD4016
CD4066
CONTROL
CD4069 1N4148
PIN 9
PIN 9
HIGH = SHUTDOWN
LOW = CODE B
CD4069 1N4148
PIN 9
HIGH = SHUTDOWN
LOW = HEX
HIGH = SHUTDOWN
LOW = CODE B
CD4069
PIN 9
OPEN DRAIN OR OPEN
COLLECTOR OUTPUT
PIN 9
FIGURE 17. ICM7228C PIN 9 DRIVE CIRCUITS
15
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