Datasheet

MAX6953
2-Wire Interfaced, 2.7V to 5.5V, 4-Digit 5
✕
7
Matrix LED Display Driver
_______________________________________________________________________________________ 5
80
85
95
90
100
105
2.5 3.53.0 4.0 4.5 5.0 5.5
DEAD CLOCK OSCILLATOR FREQUENCY
vs. SUPPLY VOLTAGE
MAX6953 toc04
SUPPLY VOLTAGE (V)
OSCILLATOR FREQUENCY (kHz)
0.95
0.97
0.96
0.99
0.98
1.00
1.01
2.5 3.5 4.03.0 4.5 5.0 5.5
OUTPUT SOURCE CURRENT
vs. SUPPLY VOLTAGE
MAX6953 toc05
SUPPLY VOLTAGE (V)
CURRENT NORMALIZED TO 40mA
WAVEFORMS AT O2 (PIN 3) AND O14
(PIN 28) V+ = 3.3V, 8/16 INTENSITY
GROUND FOR
ANODE
(PIN 014)
MAX6953 toc06
GROUND FOR
CATHODE
(PIN 03)
200µs/div
Typical Operating Characteristics (continued)
(Typical application circuit, V+ = 3.3V, LED forward voltage = 2.4V, scan limit set to 4 digits, T
A
= +25°C, unless otherwise noted.)
Pin Description
PIN
SSOP PDIP
NAME FUNCTION
1, 2, 3, 6–14, 23, 24 1, 2, 3, 7–15, 26, 27 O0 to O13
LED Cathode Drivers. O0 to O13 outputs sink current from
the display’s cathode rows.
4, 5, 17 4, 5, 6, 19 GND Ground
15 17 ISET
Segment Current Setting. Connect ISET to GND through
series resistor R
SET
to set the peak current.
16 18 AD1
Address Input 1. Sets device slave address. Connect to
either GND, V+, SCL, SDA to give four logic combinations.
See Table 3.
— 16, 25 N.C. Not Connected
18 20 BLINK Blink Output. Output is open drain.
19 21 OSC
Multiplex Clock Input. To use internal oscillator, connect
capacitor C
SET
from OSC to GND. To use external clock,
drive OSC with a 1MHz to 8MHz CMOS clock.
20 22 AD0
Address Input 0. Sets device slave address. Connect to
either GND, V+, SCL, SDA to give four logic combinations.
See Table 3.
21 23 SDA I
2
C-Compatible Serial Data I/O
22 24 SCL I
2
C-Compatible Serial Clock Input
25–31, 34, 35, 36 28–34, 38, 39, 40
O14 to O23
LED Anode Drivers. O14 to O23 outputs source current to
the display’s anode columns.
32, 33 35, 36, 37 V+
Positive Supply Voltage. Bypass V+ to GND with a 47µF
bulk capacitor and a 0.1µF ceramic capacitor.