MAX6946ATE+ Maxim Integrated Products, MAX6946ATE+ Datasheet - Page 9
![IC LED DRIVER LINEAR 16-TQFN](/photos/6/66/66625/16-tqfn_exp_pad_21-0136_sml.jpg)
MAX6946ATE+
Manufacturer Part Number
MAX6946ATE+
Description
IC LED DRIVER LINEAR 16-TQFN
Manufacturer
Maxim Integrated Products
Type
Linear (I²C Interface)r
Datasheet
1.MAX6947ATE.pdf
(24 pages)
Specifications of MAX6946ATE+
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
21120 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
Table 4. Individual Port Configuration Options (Port Output Registers 0x00–0x09)
The MAX6946/MAX6947 contain 10 I/O ports.
Configure the 10 I/O ports as logic inputs, open-drain
logic outputs, or constant-current sinks in any combina-
tion. Table 4 shows a detailed description of the indi-
vidual port configuration registers 0x00 through 0x09.
Use registers 0x00–0x09 to individually assign each
port as a logic input, open-drain logic output or con-
stant-current sink (see the PWM Intensity Control and
Figure 1. Simplified Schematic of I/O Ports
Low-logic
output
High-logic
output
Logic input
Constant-
current static
sink output
Constant-
current PWM
output
LED off
PORT TYPE
INTERFACE
TO/FROM
SERIAL
10-Port, Constant-Current LED Driver and
I/O Expander with PWM Intensity Control
REGISTER
0x03–0xFE
OUTPUT
_______________________________________________________________________________________
CODE
0x00
0x01
0x02
0xFF
OUTPUT CURRENT
GLOBAL CURRENT
OUTPUT PORT
Logic-high output with external pullup resistor; otherwise,
high impedance
8-BIT LATCH
1-BIT LATCH
3-BIT LATCH
RUN MODE (CONFIGURATION
0xFE = 254/256 PWM duty cycle
REGISTER
REGISTER
REGISTER
0x03 = 3/256 PWM duty cycle
Static constant-current sink
REGISTER BIT D0 = 1)
PORT COMMAND
Logic-high output with external pullup resistor;
READ I/O
output
MSB
Logic-low output, not constant current
I/O Ports
POSITION B: 0x02–0xFF
CLOSE SWITCH: 0x02–0xFE
POSITION A: 0x00–0x01
otherwise, high impedance
CMOS logic input
4-BIT DAC
GENERATOR
PWM
Phasing section). The I/O ports are high impedance
without V
power-up.
Figure 1 shows the I/O port structure of the MAX6946/
MAX6947. I/O ports P0 to P9 default to high impedance
on power-up, so LEDs or other port loads connected
draw no current. Ports used as inputs do not load their
source signals.
(CONFIGURATION REGISTER
CURRENT
ENABLE
SET
High impedance
DD
SHUTDOWN
BIT D0 = 0)
applied and remain high impedance upon
A
N
B
I/O PORT
Adjustable constant current
Full constant-current drive
unaffected by shutdown
APPLICATION NOTES
Lowest supply current,
with no PWM
LED off
9