MAX6952EAX Maxim Integrated Products, MAX6952EAX Datasheet - Page 15

• Manufacturer Part Number: MAX6952EAX
• Description: LED Drivers 5 x 7 Matrix LED Dis play Driver, 4-Digit
• Manufacturer: Maxim Integrated Products

Specifications of MAX6952EAX

• Number Of Digits: 4
• Number Of Segments: 140
• Low Level Output Current: 500000 uA
• High Level Output Current: 50000 uA
• Operating Supply Voltage: 2.7 V to 5.5 V
• Maximum Supply Current: 16000 uA
• Maximum Power Dissipation: 941.2 mW
• Maximum Operating Temperature: + 85 C
• Mounting Style: SMD/SMT
• Package / Case: SSOP-36
• Minimum Operating Temperature: - 40 C

The recommended value of R
allowed value since it sets the display driver to the
maximum allowed segment current. R
a higher value to set the segment current to a lower
peak value where desired. The user must also ensure
that the peak current specifications of the LEDs con-
nected to the driver are not exceeded.
The effective value of C
external capacitor used, but also the stray capacitance
from OSC to GND. This capacitance is usually in the
1pF to 5pF range, depending on the layout used.
The display-test register switches the drivers between
one of two modes: normal and display test. Display-test
mode turns all LEDs on by overriding, but not altering,
all control and digit registers (including the shutdown
Table 17. User-Definable Font Pointer Base Address Table
CHARACTER
RAM00
RAM01
RAM02
RAM03
RAM04
RAM05
RAM06
RAM07
RAM08
RAM09
RAM10
RAM11
RAM12
RAM13
RAM14
RAM15
RAM16
RAM17
RAM18
RAM19
RAM20
RAM21
RAM22
RAM23
FONT
______________________________________________________________________________________
SET
CODE (HEX)
4-Digit 5
ADDRESS
Display-Test Register
includes not only the actual
0x05
0x05
0x05
0x05
0x05
0x05
0x05
0x05
0x05
0x05
0x05
0x05
0x05
0x05
0x05
0x05
0x05
0x05
0x05
0x05
0x05
0x05
0x05
0x05
SET
SET
is the minimum
4-Wire Interfaced, 2.7V to 5.5V,
can be set to
DATA (HEX)
REGISTER
0xAD
0xBC
0xC1
0xC6
0xCB
0xD0
0xD5
0xDA
0xDF
0x8A
0x9E
0xA3
0xA8
0xB2
0xB7
0xE4
0xE9
0xEE
0x80
0x85
0x8F
0x94
0x99
0xF3
✕
7 Matrix LED Display Driver
D7
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
register). In display-test mode, eight digits are scanned
and the duty cycle is 7/16 (half power). Table 23 lists
the display-test register format.
The MAX6952 drives a peak current of 40mA into LEDs
with a 2.4V forward-voltage drop when operated from a
supply voltage of at least 3.0V. The minimum voltage
drop across the internal LED drivers is, therefore (3.0V -
2.4V) = 0.6V. If a higher supply voltage is used, the dri-
ver absorbs a higher voltage, and the driver’s power
dissipation increases accordingly. However, if the LEDs
used have a higher forward voltage drop than 2.4V, the
supply voltage must be raised accordingly to ensure
that the driver always has at least 0.6V headroom.
D6
0
0
0
0
0
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
1
1
1
Choosing Supply Voltage to Minimize
D5
0
0
0
0
0
0
0
1
1
1
1
1
1
0
0
0
0
0
0
0
1
1
1
1
Applications Information
REGISTER DATA
D4
0
0
0
0
1
1
1
0
0
0
1
1
1
0
0
0
1
1
1
1
0
0
0
1
D3
0
0
1
1
0
1
1
0
1
1
0
0
1
0
0
1
0
0
1
1
0
1
1
0
Power Dissipation
D2
0
1
0
1
1
0
1
0
0
1
0
1
1
0
1
0
0
1
0
1
1
0
1
0
D1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
D0
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
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