MAX6967ATE+ Maxim Integrated Products, MAX6967ATE+ Datasheet - Page 7

• 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

6) Take care with PC board layout. The MAX6966/
Table 1. Port Configuration Options
Low-logic
output
High-logic
output
Logic input
Constant-
current static
sink output
Constant-
current PWM
output
LED off
PORT TYPE
The tradeoff for LED intensity control is between
depth of current-control resolution, noise constraints,
and software complexity:
MAX6967 are switching moderate currents in PWM
applications, so the MAX6966/MAX6967 and the
load supplies need careful decoupling to minimize
conducted noise. Also, the serial interface is fast, so
• For high LED resolution where each LED needs
• For absolute maximum LED resolution where the
• For lowest noise applications where PWM cannot
• If the standard half/full constant-current settings
individual intensity settings, use the 8-bit PWM
control plus the 1-bit analog control to get 9 bits
of individual LED intensity control.
LED uses the same intensity settings, use the 8-
bit PWM control plus the 1-bit analog control,
plus the global 3-bit analog control to get 12 bits
of LED intensity control.
be used, 1 bit of individual analog control is
available. If all LEDs use the same intensity set-
tings, the 1-bit analog control plus the global 3-
bit analog control provide 4 bits of static LED
intensity control.
of 10mA/20mA are not acceptable, then the
global 3-bit analog control can be used to
reduce the currents for all the constant-current
outputs.
10-Port Constant-Current LED Drivers and I/O
REGISTER
0x03–0xFE
OUTPUT
_______________________________________________________________________________________
CODE
0x00
0x01
0x02
0xFF
Expanders with PWM Intensity Control
PWM constant-current sink output
SHUTDOWN (CONFIGURATION
Logic-high output with external pullup resistor; otherwise, high
Static constant-current sink
Logic-high output with external pullup resistor; otherwise, high
REGISTER BIT D0 = 1)
BEHAVIOR OUT OF
output
Logic-low output, not constant current
CMOS logic input
impedance
impedance
The MAX6966/MAX6967 are general-purpose input/out-
put (GPIO) peripherals that provide 10 I/O ports, P0 to
P9, controlled through a high-speed SPI-compatible
serial interface. The 10 I/O ports can be used as logic
inputs, open-drain logic outputs, or constant-current
sinks in any combination. Ports withstand 7V indepen-
dent of the MAX6966’s or MAX6967’s supply voltage
whether used as logic inputs, logic outputs, or con-
stant-current sinks.
Ports configured as constant-current outputs can be set
to sink either a constant current of either 10mA or 20mA.
The static port current may be PWM with a duty cycle
ranging from 3/256 to 254/256 to reduce the average
current, or remain static.
Ports configured as open-drain logic outputs have a
relatively weak sink capability, which should still be
adequate for normal logic-level outputs. Open-drain
logic outputs typically require external pullup resistors
to the appropriate positive supply to provide the logic-
high reference. The weak drive means that the short-
circuit current is low enough that inadvertently driving
an LED from a port configured as a logic output is
unlikely to damage the LED.
The MAX6966/MAX6967 are rated for all 10 outputs to
carry their maximum 20mA loads at the same time. The
port configuration options are shown in
(CONFIGURATION REGISTER
BEHAVIOR IN SHUTDOWN
simple overshoot-damping terminations may be
required if the tracks are long.
High impedance
BIT D0 = 0)
Detailed Description
Adjustable constant current
Full constant-current drive
unaffected by shutdown
APPLICATION NOTES
Lowest supply current
with no PWM noise
Table
LED off
1.
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