MAX6954 Maxim, MAX6954 Datasheet - Page 5

• Manufacturer Part Number: MAX6954
• Description: 4-Wire Interfaced / 2.7V to 5.5V LED Display Driver with I/O Expander and Key Scan
• Manufacturer: Maxim

(V+ = 3.3V, LED forward voltage = 2.4V, typical application circuit, T
4-Wire Interfaced, 2.7V to 5.5V LED Display
O18
0.30
0.25
0.20
0.15
0.10
0.05
O0
110
105
100
0V
0V
95
90
85
80
0
-40
2.5
DEAD CLOCK OSCILLATOR FREQUENCY
_______________________________________________________________________________________
R
OSC = GND
WAVEFORM AT PINS O0 AND O18,
SET
PORT INPUT PULLUP CURRENT
V
CC
3.0
-10
Driver with I/O Expander and Key Scan
= 56k
= 2.5V
vs. SUPPLY VOLTAGE
MAXIMUM INTENSITY
vs. TEMPERATURE
V
SUPPLY VOLTAGE (V)
CC
TEMPERATURE ( C)
3.5
20
= 5.5V
V
200 s/div
CC
1V/div
4.0
= 3.3V
50
4.5
OUTPUT = HIGH
V
PORT
80
= 1.4V
5.0
MAX6954 toc06
Typical Operating Characteristics (continued)
110
5.5
A
= +25°C, unless otherwise noted.)
KEY_A
IRQ
1.02
1.00
0.98
0.96
0.94
0.92
0V
0V
45
40
35
30
25
20
15
10
5
0
2.5
-40
V
CC
SEGMENT SOURCE CURRENT
3.0
-10
= 3.3V
vs. SUPPLY VOLTAGE
KEYSCAN OPERATION
GPIO SINK CURRENT
vs. TEMPERATURE
V
SUPPLY VOLTAGE (V)
(KEY_A AND IRQ)
CC
3.5
TEMPERATURE ( C)
20
= 2.5V
KEY_A: 1V/div
IRQ: 2V/div
400 s/div
4.0
50
V
CC
OUTPUT = LOW
V
PORT
= 5.5V
4.5
= 0.6V
80
V
LED
5.0
MAX6954 toc09
= 1.8V
110
5.5
5