MAX6947ATE+ Maxim Integrated Products, MAX6947ATE+ Datasheet - Page 11
![IC LED DRIVER LINEAR 16-TQFN](/photos/6/66/66625/16-tqfn_exp_pad_21-0136_sml.jpg)
MAX6947ATE+
Manufacturer Part Number
MAX6947ATE+
Description
IC LED DRIVER LINEAR 16-TQFN
Manufacturer
Maxim Integrated Products
Type
Linear (I²C Interface)r
Datasheet
1.MAX6947ATE.pdf
(24 pages)
Specifications of MAX6947ATE+
Constant Current
Yes
Topology
Open Drain, PWM
Number Of Outputs
10
Internal Driver
Yes
Type - Primary
Backlight
Type - Secondary
RGB, White LED
Frequency
400kHz
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
3
Low Level Output Current
21.12 mA
Operating Supply Voltage
2.25 V to 3.6 V
Maximum Supply Current
60 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
The MAX6946/MAX6947 use an internal 32kHz oscilla-
tor to generate PWM timing for LED intensity control.
The MAX6946 also features an OSC input to allow for
an external clock for generating PWM timing for LED
intensity control. Select the PWM clock source for the
MAX6946 with configuration register bit D7 (Table 2).
The MAX6947 powers up configured to use the internal
32kHz oscillator by default. The MAX6946 powers up
configured to use the external clock source by default.
A PWM period comprises 256 cycles of the nominal
32kHz PWM clock (Figure 2). Individually set the ports’
PWM duty cycle between 3/256 and 254/256. See
Table 4 for port register settings.
Configure PWM timing by setting the stagger bit in the
configuration register (Table 2), either with output stag-
gering or without. Clearing the stagger bit causes all
outputs using PWM to switch at the same time using
Figure 2. Static and PWM Constant-Current Waveforms
REGISTER
0x00
0x01
0x02
0x03
0x04
0xFC
0xFD
0xFE
0xFF
OUTPUT
VALUE
PWM Intensity Control and Phasing
10-Port, Constant-Current LED Driver and
I/O Expander with PWM Intensity Control
______________________________________________________________________________________
OUTPUT LOW 252/256 DUTY CONSTANT CURRENT WITH INPUT BUFFER DISABLED (PWM LED DRIVE)
OUTPUT LOW 253/256 DUTY CONSTANT CURRENT WITH INPUT BUFFER DISABLED (PWM LED DRIVE)
OUTPUT LOW 254/256 DUTY CONSTANT CURRENT WITH INPUT BUFFER DISABLED (PWM LED DRIVE)
OUTPUT STATIC-LOW CONSTANT CURRENT WITH INPUT BUFFER DISABLED (STATIC LED DRIVE ON)
OUTPUT LOW 3/256 DUTY CONSTANT CURRENT WITH INPUT BUFFER DISABLED (PWM LED DRIVE)
OUTPUT LOW 4/256 DUTY CONSTANT CURRENT WITH INPUT BUFFER DISABLED (PWM LED DRIVE)
OUTPUT STATIC HIGH IMPEDANCE WITH INPUT BUFFER DISABLED (STATIC LED DRIVE OFF)
OUTPUT STATIC-HIGH LOGIC DRIVE WITH INPUT BUFFER ENABLED (GPI)
OUTPUT STATIC-LOW LOGIC DRIVE WITH INPUT BUFFER ENABLED (GPI)
7.8125ms NOMINAL PWM PERIOD
the timing shown in Figure 2. All outputs, therefore,
draw load current at the exactly same time for the same
PWM setting. This means that if, for example, all out-
puts are set to 0x80 (128/256 duty cycle), the current
draw would be zero (all loads off) for half the time, and
full (all loads on) for the other half.
Setting the stagger bit causes the PWM timing of the 10
port outputs to stagger by 32 counts of the 256-count
PWM period (i.e., 1/8th), distributing the port output
switching points across the PWM period (Figure 3).
Staggering reduces the di/dt output-switching transient
on the supply and also reduces the peak/mean current
requirement.
Set or clear the stagger bit during shutdown. Changing
the stagger bit during normal operation can cause a
transient flicker in any PWM-controlled LEDs because
of the fundamental PWM timing changes.
HIGH-Z
HIGH-Z
HIGH-Z
HIGH-Z
HIGH-Z
HIGH-Z
HIGH-Z
HIGH-Z
HIGH-Z
LOW
LOW
LOW
LOW
LOW
LOW
LOW
LOW
LOW
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