ICM7228 Datasheet, PDF (15/17 Pages) Intersil Corporation – 8-Digit, Microprocessor- Compatible, LED Display Decoder Driver

ICM7228
DIGIT
STROBE
INTERDIGIT
BLANKING
V_DD
P
≈200mA
COMMON
ANODE
N
N
N ^DIGIT
≈2kΩ ^OUTPUT
SHUTDOWN
V_SS
N
≈2kΩ
V_SS
NOTE: When SHUTDOWN goes low INTERDIGIT BLANKING also
stays low.
FIGURE 12A. DIGIT DRIVER
SEGMENT
DATA
INTERDIGIT
BLANKING
V_DD
P
≈200mA
100Ω
N
N
≈2kΩ
COMMON
CATHODE
SEGMENT
OUTPUT
SHUTDOWN
V_SS
N
≈2kΩ
V_SS
NOTE: When SHUTDOWN goes low INTERDIGIT BLANKING also
stays low.
FIGURE 13B. SEGMENT DRIVER
FIGURE 13. COMMON CATHODE DISPLAY DRIVERS
V_DD
V_DD
SEGMENT
DATA
INTERDIGIT
BLANKING
SHUTDOWN
V_DD
P
≈2kΩ
COMMON
ANODE
N
SEGMENT
≈75Ω ^OUTPUT
V_SS
DIGIT
OUTPUT
ICM7228A/B
V_DD
SEGMENT
OUTPUT
V_DD
10K
UP TO
4A
FIGURE 12B. SEGMENT DRIVER
FIGURE 12. COMMON ANODE DISPLAY DRIVERS
DIGIT
STROBE
INTERDIGIT
BLANKING
SHUTDOWN
V_DD
P
≈2kΩ
COMMON
CATHODE
N
DIGIT
≈15Ω ^OUTPUT
V_SS
V_SS
V_SS
FIGURE 14. DRIVING HIGH CURRENT DISPLAY, COMMON
ANODE ICM7228A/C TO COMMON ANODE DISPLAY
V_DD
V_DD
100Ω
SEGMENT
OUTPUT
ICM7228C/D
V_DD
2N2219
14Ω (100mA_PEAK)
FIGURE 13A. DIGIT DRIVER
DIGIT
OUTPUT
N
≈15Ω
14mA
2N6034
1.4A_PEAK
V_SS
V_SS
FIGURE 15. DRIVING HIGH CURRENT DISPLAY, COMMON
CATHODE ICM7228B/D TO COMMON CATHODE
DISPLAY
9-31