ICM7228AIBI Intersil, ICM7228AIBI Datasheet - Page 15

• Manufacturer Part Number: ICM7228AIBI
• Description: IC LED DISPLAY DRVR 8DGT 28-SOIC
• Manufacturer: Intersil

Specifications of ICM7228AIBI

• Display Type: LED
• Configuration: 7 Segment
• Digits Or Characters: 8 Digits
• Current - Supply: 200µA
• Voltage - Supply: 4 V ~ 6 V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 28-SOIC (7.5mm Width)
• Driver Case Style: SOIC
• Peak Reflow Compatible (260 C): No
• Supply Voltage Max: 5V
• Source Output Current Max: 100mA
• Leaded Process Compatible: No
• No. Of Pins: 28
• No. Of Drivers: 1
• Rohs Compliant: No
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Interface: -

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.
ICM7228B
FIGURE 16. DRIVING HIGH CURRENT DISPLAY, COMMON
HIGH = HEX
LOW = SHUTDOWN
HIGH = HEX OR SHUTDOWN
LOW = CODE B
HIGH = HEX
LOW = SHUTDOWN
HIGH = HEX OR SHUTDOWN
LOW = CODE B
HIGH = CODE B
LOW = HEX
HIGH = SHUTDOWN
LOW = CODE B
HIGH = SHUTDOWN
LOW = HEX
HIGH = SHUTDOWN
LOW = CODE B
100Ω
V
V
DD
SS
FIGURE 17. ICM7228C PIN 9 DRIVE CIRCUITS
≈
V
N
15Ω
DD
SEGMENT
OUTPUT
OUTPUT
CATHODE ICM7228B TO COMMON ANODE
DISPLAY
DIGIT
300Ω
15
74C126 THREE-STATE BUFFER
V
1K
DD
CD4069
CD4069
CD4069
OPEN DRAIN OR OPEN
COLLECTOR OUTPUT
1K
CONTROL
1K
V
CD4016
CD4066
SS
V
1.4A
2N6034
25Ω
(100mA
2N2219
DD
1N4148
1N4148
PEAK
PEAK
)
PIN 9
PIN 9
PIN 9
PIN 9
PIN 9
PIN 9
ICM7228
Power Supply Bypassing
Connect a minimum of 47µF in parallel with 0.1µF capacitors
between V
should be placed in close proximity to the device to reduce
the power supply ripple caused by the multiplexed LED
display drive current pulses.
DD
and V
SS
of ICM7228. These capacitors