MAX6947ATE+T Maxim Integrated Products, MAX6947ATE+T Datasheet - Page 9

• Manufacturer Part Number: MAX6947ATE+T
• Description: IC LED DRIVER LINEAR 16-TQFN
• Manufacturer: Maxim Integrated Products
• Type: Linear (I²C Interface)r

Specifications of MAX6947ATE+T

• 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

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