MAX6964ATG+ Maxim Integrated Products, MAX6964ATG+ Datasheet - Page 6

• Manufacturer Part Number: MAX6964ATG+
• Description: IC LED DRIVER LINEAR 24-TQFN
• Manufacturer: Maxim Integrated Products
• Type: Linear (I²C Interface)r

Specifications of MAX6964ATG+

• Topology: Open Drain, PWM
• Number Of Outputs: 17
• Internal Driver: Yes
• Type - Primary: Backlight, LED Blinker
• Type - Secondary: RGB, White LED
• Frequency: 400kHz
• Voltage - Supply: 2 V ~ 3.6 V
• Voltage - Output: 7V
• Mounting Type: Surface Mount
• Package / Case: 24-TQFN Exposed Pad
• Operating Temperature: -40°C ~ 125°C
• Current - Output / Channel: 50mA
• Internal Switch(s): Yes
• Number Of Segments: 12
• Low Level Output Current: 50 mA
• Operating Supply Voltage: 2 V to 3.6 V
• Maximum Supply Current: 122.1 uA
• Maximum Power Dissipation: 1666 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 MAX6964 is a general-purpose output (GPO)
peripheral that provides 17 output ports, O0–O16, con-
trolled through an I
outputs sink loads up to 50mA connected to external
supplies up to 7V, independent of the MAX6964’s sup-
ply voltage. The MAX6964 is rated for a ground current
of 350mA, allowing all 17 outputs to sink 20mA at the
same time. Figure 1 shows the output structure of the
MAX6964. The outputs default to logic high (high
impedance unless external pullup resistors are used)
on power-up.
The two blink phase 0 registers set the output logic lev-
els of the 16 outputs O0–O15 (Table 6). These registers
control the port outputs if the blink function is disabled.
A duplicate pair of registers, the blink phase 1 regis-
ters, are also used if the blink function is enabled
(Table 7). In blink mode, the outputs can be flipped
between using the blink phase 0 registers, and the
blink phase 1 registers using hardware control (the
17-Output LED Driver/GPO with
Intensity Control and Hot-Insertion Protection
Figure 1. Simplified Schematic of I/O Ports
Figure 2. 2-Wire Serial Interface Timing Details
6
_______________________________________________________________________________________
SHIFT REGISTER
WRITE PULSE
DATA FROM
SDA
SCL
t
Output Control and LED Blinking
HD,STA
START CONDITION
REGISTER
2
OUTPUT
D
C
C-compatible serial interface. All
PORT
K
FF
Functional Overview
Q
Q
t
LOW
OUTPUT PORT
REGISTER DATA
t
R
t
SU,DAT
t
HIGH
t
F
Q2
I/O PIN
GND
t
HD,DAT
t
REPEATED START CONDITION
SU,STA
BLINK input) and/or software control (the blink flip flag
in the configuration register) (Table 4).
The 17th output, O16, is controlled through 2 bits in the
configuration register, which provide the same static or
blink control as the other 16 outputs (Table 4).
The logic level of the BLINK input may be read back
through the blink status bit in the configuration register
(Table 4). The BLINK input, therefore, may be used as
a general-purpose logic input (GPI port) if the blink
function is not required.
The MAX6964 includes an internal oscillator, nominally
32kHz, to generate PWM timing for LED intensity con-
trol. PWM intensity control can be enabled on an out-
put-by-output basis, allowing the MAX6964 to provide
any mix of PWM LED drives and glitch-free logic out-
puts (Table 8). PWM can be disabled entirely, in which
case all outputs are static and the MAX6964 operating
current is lowest because the internal oscillator is
turned off.
PWM intensity control uses a 4-bit master control and 4
bits of individual control per output (Tables 11 and 12).
The 4-bit master control provides 16 levels of overall
intensity control, which applies to all PWM-enabled out-
puts. The master control sets the maximum pulse width
from 1/15 to 15/15 of the PWM time period. The individ-
ual settings comprise a 4-bit number, further reducing
the duty cycle to be from 1/16 to 15/16 of the time win-
dow set by the master control.
For applications requiring the same PWM setting for all
output ports, a single global PWM control can be used
instead of all the individual controls to simplify the con-
trol software and provide 240 steps of intensity control
(Tables 8 and 11).
t
HD,STA
t
SU,STO
PWM Intensity Control
CONDITION
STOP
t
BUF
CONDITION
START