MAX6967ATE+ Maxim Integrated Products, MAX6967ATE+ Datasheet - Page 20

• Manufacturer Part Number: MAX6967ATE+
• Description: IC LED DRIVER LINEAR 16-TQFN
• Manufacturer: Maxim Integrated Products
• Type: Linear (Serial Interface)r

Specifications of MAX6967ATE+

• 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: 21.1 mA
• Operating Supply Voltage: 2.25 V to 3.6 V
• Maximum Supply Current: 730 uA
• 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: Details

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