MAX6975ATL+T Maxim Integrated Products, MAX6975ATL+T Datasheet - Page 15

• Manufacturer Part Number: MAX6975ATL+T
• Description: IC LED DRIVER LINEAR 40-TQFN
• Manufacturer: Maxim Integrated Products
• Type: Linear (Serial Interface)r

Specifications of MAX6975ATL+T

• 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
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Efficiency: -
• Lead Free Status / Rohs Status: Details

The global-intensity data is received in an intermediate
register and is applied to the outputs at subframe 0 and
PWM clock 0.
The MAX6974/MAX6975 have one byte of configuration
data with 5 active bit settings as shown in Table 6. One
byte of data containing configuration bit settings is sent
three times. Data is updated immediately into the CAL-
DAC latches. See Table 10 . The loaded configuration
settings take effect immediately.
Table 6. Load Configuration Bit Definitions
MSB
LSB
CONFIGURATION BIT
D3
D7
D0
D6
D5
D4
D2
D1
______________________________________________________________________________________
ACRONYM
PWM-ON
WDOG
GLB4
CRST
MUX
—
—
—
Global quarter
Reset frame
FUNCTION
Watchdog
and PWM
individual
counters
Multiplex
Enable
enable
enable
PWMs
0
0
0
24-Output PWM LED Drivers
Not used
Not used
Not used
Enables the reduced global-intensity setting in the MAX6975 when set to
1. When set, the MAX6975 uses eight (or four, if multiplexing) PWM
subframes. GLB4 is set to 0 as power-on default. Setting bit D4 has no
effect in the MAX6974.
Turns all individual PWM outputs on when set to 1. Power-on default is
PWM-ON set to 0 to disable all current output drivers. PWM-ON can be
used to turn all LEDs on or off without affecting the global-intensity or
individual PWM settings.
Setting CRST to 1 synchronously resets internal counters to 0. This action
sets the MAX6974/MAX6975 to subframe 0 of the global-intensity
subframe counter and clock 0 of all individual PWM counters. The CRST
bit is a nonlatching control function that resets to 0 after the counters are
set to 0.
Setting WDOG to 1 enables the watchdog timer operation. Power-on
default is 0.
Setting MUX to 1 turns multiplex mode on. Power-on default is 0.
The MAX6974/MAX6975 feature a fully synchronous
and fully buffered serial interface that allows cascading
of multiple devices. The serial interface consists of
inputs (CLKI, DIN, and LOADI) and outputs (CLKO,
DOUT, and LOADO). The MAX6974/MAX6975 can
pass different data to each cascaded device without
any additional inputs to identify the position of the
devices in the cascaded chain.
for Message Boards
DESCRIPTION
Serial Interface
15