MAX6974ATL+ Maxim Integrated Products, MAX6974ATL+ Datasheet - Page 20

• Manufacturer Part Number: MAX6974ATL+
• Description: IC LED DRIVER LINEAR 40-TQFN
• Manufacturer: Maxim Integrated Products
• Type: Linear (Serial Interface)r

Specifications of MAX6974ATL+

• Topology: PWM
• Number Of Outputs: 24
• Internal Driver: Yes
• Type - Primary: General Purpose
• Type - Secondary: RGB
• Frequency: 33MHz
• Voltage - Supply: 3 V ~ 3.6 V
• Voltage - Output: 7V
• Mounting Type: Surface Mount
• Package / Case: 40-TQFN Exposed Pad
• Operating Temperature: -40°C ~ 125°C
• Current - Output / Channel: 30mA
• Internal Switch(s): Yes
• Low Level Output Current: 6 mA
• High Level Output Current: 30 mA
• Operating Supply Voltage: 3 V to 3.6 V
• Maximum Supply Current: 77 mA
• Maximum Power Dissipation: 2963 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

When the MAX6974/MAX6975 send individual-intensity
PWM data, the data segment bit length is large due to
the 12-bit or 14-bit PWM data for each of the 24 outputs
(see Figure 11). The various data segment bit lengths
for each of the four commands and different operating
modes is shown in Table 4. Data capturing is the same
as described above with the header segment outputs
and data being delayed by the full length of the data bit
stream being captured plus one clock cycle.
The MAX6974/MAX6975 feature LED open-circuit
detection and overtemperature detection that use the
counter section of the header segment to record
detected faults. Using commands 01 or 11 force the
counter to record LED open-circuit detection faults.
Using commands 00 or 10 force the counter to record
overtemperature faults.
The MAX6974/MAX6975 detect an open circuit on a driver
output by monitoring for output voltages below 200mV.
When an open circuit is detected, the MAX6974/
MAX6975 increment the counter segment data,
CNTR[9:0], received on DIN by 1 before transmitting a
24-Output PWM LED Drivers
for Message Boards
Figure 11. Long (288 Bits) PWM Data Cascading Shown for
MAX6974 in Nonmultiplexed Mode
Figure 12. Typical Cascaded Serial-Interface Termination Circuit
20
D0
D1
D2
D3
H1
______________________________________________________________________________________
DATA 1 PWM 288 BITS
289 CLOCKS
Overtemperature Detection Counter
HOST
H2
LOAD
DATA 2 PWM 288 BITS DATA 3 PWM 288 BITS T
CLK
DATA 2 PWM 288 BITS DATA 3 PWM 288 BITS T
DIN
289 CLOCKS
LED Open-Circuit and
H3
DATA 3 PWM 288 BITS T
DIN1
DIN2
289 CLOCKS
MAX9112
DO1+
DO2+
DO2-
DO1-
H4
T
110Ω
110Ω
header and new counter value out DOUT. Regardless
of the number of open-circuit outputs on a device, the
counter increment is 1.
The MAX6974/MAX6975 detect die temperatures above
T
all PWM data to zero. During an overtemperature event,
the MAX6974/MAX6975 increment the counter segment
data, CNTR[9:0], received on DIN by 1 before transmitting
a header and new counter value out DOUT. The output
drivers are allowed to be on when the die temperature
falls below T
When there is no fault detected, the counter data is
passed directly to DOUT unaltered.
The MAX6974/MAX6975’s layout simplifies cascading
multiple devices, as the interface signals flow through
from each device. The synchronous and buffered
nature of the interface simplifies the board design, but
pay attention to signal routing and termination, as with
other high-speed logic circuits.
Terminate the differential input pairs, CLKI+ and CLKI-,
as well as DIN+ and DIN-, with a termination resistor as
close as possible to the package. When using the
MAX6974/MAX6975 as the signal source, use a 200Ω
termination resistor. When using a level translator or clock
retimer as the signal source, use a 110Ω termination
resistor. Route each differential input pair as close
parallel tracks with spacing or a GND trace between
the track pair and the next signal track to minimize
cross-coupling. Track lengths up to a few inches do not
require termination-matched tracks (transmission lines).
LOADI
DIE
DIN+
DIN-
CLKI+
CLKI-
MAX6974
= +165°C and disable all output drivers by setting
n-1
LOADO
DOUT+
CLKO+
DOUT-
CLKO-
DIE
Applications Information
= +150°C.
200Ω
200Ω
Terminations and PCB Layout
n MORE DEVICES WITH
LOADI
DIN+
DIN-
CLKI+
CLKI-
200Ω
MAX6974
TERMINATION
n-2
LOADO
DOUT+
CLKO+
CLKO-
DOUT-