MAX6966ATE+ Maxim Integrated Products, MAX6966ATE+ Datasheet - Page 20
![IC LED DRIVER LINEAR 16-TQFN](/photos/6/66/66625/16-tqfn_exp_pad_21-0136_sml.jpg)
MAX6966ATE+
Manufacturer Part Number
MAX6966ATE+
Description
IC LED DRIVER LINEAR 16-TQFN
Manufacturer
Maxim Integrated Products
Type
Linear (Serial Interface)r
Datasheet
1.MAX6966ATE.pdf
(29 pages)
Specifications of MAX6966ATE+
Constant Current
Yes
Topology
Open Drain, PWM
Number Of Outputs
10
Internal Driver
Yes
Type - Primary
Backlight
Type - Secondary
RGB, White LED
Frequency
270kHz ~ 450kHz
Voltage - Supply
2.25 V ~ 3.6 V
Voltage - Output
7V
Mounting Type
Surface Mount
Package / Case
16-TQFN Exposed Pad
Operating Temperature
-40°C ~ 125°C
Current - Output / Channel
20mA
Internal Switch(s)
Yes
Number Of Segments
10
Low Level Output Current
21100 uA
Operating Supply Voltage
2.25 V to 3.6 V
Maximum Supply Current
4 mA
Maximum Power Dissipation
1176 mW
Maximum Operating Temperature
+ 125 C
Mounting Style
SMD/SMT
Minimum Operating Temperature
- 40 C
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Efficiency
-
Lead Free Status / Rohs Status
Lead free / RoHS Compliant
10-Port Constant-Current LED Drivers and I/O
Expanders with PWM Intensity Control
Ramp-up and ramp-down use the PWM clock for timing.
If the external oscillator is selected, then this clock
should be provided until the end of the sequence. If the
internal oscillator is selected, it always runs during a
fade sequence, even if none of the ports are using PWM.
The ramp-up and ramp-down circuit operates a 3-bit
DAC. The DAC adjusts the internal current reference
used to set the constant-current outputs in a similar
manner to the global current register
Because it is the master current reference that is
scaled, all output constant-current and PWM settings
Table 10. Ramp-Up Register Format
Figure
20
Write ramp-up
Read ramp-up
Ramp-up time (f
Instant full current coming out from shutdown
1/16s ramp-up to full current coming out from shutdown
1/8s ramp-up to full current coming out from shutdown
1/4s ramp-up to full current coming out from shutdown
1/2s ramp-up to full current coming out from shutdown
1s ramp-up to full current coming out from shutdown
2s ramp-up to full current coming out from shutdown
4s ramp-up to full current coming out from shutdown
CURRENT
17.5mA
12.5mA
7.5mA
2.5mA
20mA
15mA
10mA
0mA
5mA
______________________________________________________________________________________
PORT CURRENT = FULL
6. Output Fade DAC (Global Current = 0x07)
PORT CURRENT = HALF
CURRENT
FULL
FADE-UP
CURRENT
7/8
PWM
CURRENT
6/8
= 32768Hz)
REGISTER
CURRENT
5/8
CURRENT
4/8
CURRENT
3/8
CURRENT
FADE-OFF
2/8
(Table
CURRENT
1/8
CURRENT
ZERO
8).
R/W
0
1
X
X
X
X
X
X
X
X
are adjusted at the same ratio with respect to each
other. This means that LEDs are always faded at the
same rate even if their different intensity settings are
totally different.
The maximum port output current set by the global cur-
rent register
down that the current starts falling, and the point during
ramp-up that the current stops rising.
the ramp waveforms that occur with different global
current register settings.
Figure
ADDRESS
CODE
(HEX)
0x12
CURRENT
12.5mA
17.5mA
7.5mA
2.5mA
20mA
15mA
10mA
7. Global Current Modifies Fade Behavior
5mA
0mA
GLOBAL CURRENT = 0x07
GLOBAL CURRENT = 0x06
GLOBAL CURRENT = 0x05
GLOBAL CURRENT = 0x04
GLOBAL CURRENT = 0x03
GLOBAL CURRENT = 0x02
GLOBAL CURRENT = 0x01
GLOBAL CURRENT = 0x00
CURRENT
FULL
(Table
FADE-UP
D7
X
0
X
X
X
X
X
X
X
X
CURRENT
Figure
7/8
D6
X
0
X
X
X
X
X
X
X
X
8) also sets the point during ramp-
CURRENT
6/8
6 shows output fade DAC.
D5
CURRENT
X
0
X
X
X
X
X
X
X
X
REGISTER DATA
5/8
D4
CURRENT
X
0
X
X
X
X
X
X
X
X
4/8
CURRENT
D3
3/8
X
0
X
X
X
X
X
X
X
X
Figure
CURRENT
D2
2/8
FADE-OFF
0
0
0
0
1
1
1
1
Ramp-up
CURRENT
1/8
D1
7 shows
0
0
1
1
0
0
1
1
ZERO
CURRENT
D0
0
1
0
1
0
1
0
1