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MAX6975 の電気的特性と機能

MAX6975のメーカーはMaxim Integrated Productsです、この部品の機能は「(MAX6974 / MAX6975) 24-Output PWM LED Drivers」です。


製品の詳細 ( Datasheet PDF )

部品番号 MAX6975
部品説明 (MAX6974 / MAX6975) 24-Output PWM LED Drivers
メーカ Maxim Integrated Products
ロゴ Maxim Integrated Products ロゴ 




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MAX6975 Datasheet, MAX6975 PDF,ピン配置, 機能
www.DataSheet4U.com
19-0555; Rev 0; 5/06
24-Output PWM LED Drivers
for Message Boards
General Description
The MAX6974/MAX6975 precision current-sinking,
24-output PWM LED drivers drive red, green, and blue
LEDs for full-color graphic message boards and video
displays. Each output has an individual 12-bit (MAX6974)
or 14-bit (MAX6975) PWM-intensity (hue) control and
7-bit (MAX6974) or 5-bit (MAX6975) global PWM intensity
(luminance) control. The MAX6974/MAX6975 feature a
high-speed, fully buffered cascadable serial interface,
open-circuit LED fault detection circuitry, as well as a
watchdog timer.
The driver has three banks of eight outputs, with each
bank intended to drive a different color in RGB applica-
tions. The full-scale current for each bank of eight out-
puts is adjustable from 6mA to 30mA in 256 steps
(0.3125% per step) to calibrate each color.
The MAX6974/MAX6975 can optionally multiplex by
using outputs MUX0 and MUX1, which each drive an
external pnp transistor. Multiplexing doubles the
MAX6974/MAX6975 drive capability to 48 LEDs.
The MAX6974/MAX6975 operate from a 3.0V to 3.6V
power supply. The LED power supply can range from
3V to 7V. The LED drivers require only 0.8V headroom
above the LEDs’ forward-voltage drop. Using a sepa-
rate LED supply voltage for each LED minimizes power
consumption.
The serial interface uses differential signaling for the
high-speed clock and data signals to reduce EMI and
improve signal integrity. The MAX6974/MAX6975 buffer
all interface signals to simplify cascading devices in
modules that use a large number of drivers.
An internal watchdog timer, when enabled, automatically
clears the pixel-data registers and blanks the display if
any of the signal inputs fail to toggle within 40ms.
The MAX6974/MAX6975 are available in 40-pin TQFN
packages and operate over the -40°C to +125°C
temperature range.
Refer to the MAX6972/MAX6973 data sheet for a
16-output, 11mA to 55mA software-compatible device.
EZCascade is a trademark of Maxim Integrated Products, Inc.
Applications
LED Video Display Panels
LED Message Boards
Variable Message Signs (VMS)
Signs
Graphic Panels
Typical Operating Circuit appears at the end of data sheet.
Features
o 24 LED Current Sink Outputs (Three Banks of
Eight Outputs)
o 48 LED Drive Option When Multiplexing
o 33MHz Clock Supports Up to 63 Frames per
Second of Video
o Constant Output Current Calibration from 6mA to
30mA in 256 Steps
o EZCascade™ Interface Simplifies Multiple Driver
Cascading Without External Buffers
o 12-Bit or 14-Bit Individual PWM LED Intensity
Controls
o 7-Bit or 5-Bit Panel PWM-Intensity Control
o +3V to +7V LED Power Supply
o +3.0V to +3.6V Logic Supply
o Open-Circuit LED Fault Detection
o Optional Watchdog Timer Blanks Display if
Interface Fails
o Standard -40°C to +125°C Operating Temperature
Range
Ordering Information
PART
TEMP RANGE PIN-
PACKAGE
PKG
CODE
MAX6974ATL+ -40°C to +125°C 40 TQFN-EP* T4066-3
MAX6975ATL+ -40°C to +125°C 40 TQFN-EP* T4066-3
*EP = Exposed pad.
+Denotes lead-free package.
Pin Configuration
TOP VIEW
30 29 28 27 26 25 24 23 22 21
AGND 31
20 G4
B7 32
B6 33
19 G3
EP* 18 G2
B5 34
17 G1
B4 35
B3 36
B2 37
MAX6974ATL/
MAX6975ATL
16 G0
15 R7
14 R6
B1 38
B0 39
+
13 R5
12 R4
VDD 40
11 R3
1 2 3 4 5 6 7 8 9 10
*EP = EXPOSED PADDLE.
TQFN-EP
________________________________________________________________ Maxim Integrated Products 1
For pricing delivery, and ordering information please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.

1 Page





MAX6975 pdf, ピン配列
24-Output PWM LED Drivers
for Message Boards
ELECTRICAL CHARACTERISTICS (continued)
(VDD = 3.0V to 3.6V, TA = TMIN to TMAX, unless otherwise noted. Typical values are at VDD = 3.3V, TA = +85°C.) (Note 1)
PARAMETER
Output Slew Time LOADO
Output Low Voltage MUX_
Open-Circuit Detection
Output Voltage Slew Time
R0–R7, G0–G7, B0–B7
Full-Scale Port Output Current
R0–R7, G0–G7, B0–B7
Port-to-Port Current Matching
R0–R7, G0–G7, B0–B7
SYMBOL
CONDITIONS
MIN TYP MAX UNITS
20% to 80%, 80% to 20%, load = 10pF
3 ns
VOLM
VOCD
ISINK = 40mA
0.4
200
V
mV
80% to 20%, load = 50pF,
calibration DACs set to 0xFF
100 ns
ISINKFS
VDD = 3.3V, VO = 1.2V,
TA = +85°C
calibration DACs set to 0xFF TA = TMIN to TMAX
28
26
30
32
34
mA
ΔISINK
VDD = 3.3V, VO = 1.2V,
calibration DACs set to 0xFF
ISINK = 30mA (Note 2)
TA = +125°C
(Note 3)
TA = +85°C
TA = -40°C
(Note 3)
±0.7
±0.7
±0.9
2.7
2
3.3
%
Output Load Regulation
ΔIOLR
VDD = 3.3V, VO = 1.2V to 3.0V, TA = +85°C
calibration DACs set to 0x80,
ISINK = 18mA
TA = TMIN to TMAX
0.3 1.15
mA/V
1.5
Output Power-Supply Rejection
ΔIOPSR
VDD = 3.0 V to 3.6V, VO = 1.2V, TA = +85°C
calibration DACs set to 0x80,
ISINK = 18mA
TA = TMIN to TMAX
0.6 1.7
mA/V
2.0
TIMING CHARACTERISTICS
(VDD = 3.0V to 3.6V, TA = TMIN to TMAX, unless otherwise noted. Typical values are at 3.3V, TA = +85°C.) (Note 1)
PARAMETER
SYMBOL
CONDITIONS
MIN
CLKI_ Input Frequency
CLKI_ Duty Cycle
fCLKI
40
CLKO_ Output Delay
DIN_ Setup Time
DIN_ Hold Time
DOUT_ Output Delay
LOADO Output Delay
LOADI Hold Time
Watchdog Period
tPD-CLKO
tSU-DIN
tHD-DIN
tPD-DOUT
tPD-LOADO
tHD-LOADI
When enabled
0.5
5
8
40
Note 1: All parameters tested at TA = +85°C. Specifications over temperature are guaranteed by design.
Note 2: Specification limits apply to devices at the same TA for TA = TMIN to TMAX.
Note 3: Guaranteed by design.
TYP
125
MAX
33
60
16
15
18
300
UNITS
MHz
%
ns
ns
ns
ns
ns
ns
ms
_______________________________________________________________________________________ 3


3Pages


MAX6975 電子部品, 半導体
24-Output PWM LED Drivers
for Message Boards
MAX6974 Block Diagram
EXT. PNP
R LED OUTPUTS
R7 R6 R5 R4 R3 R2 R1 R0
G LED OUTPUTS
G7 G6 G5 G4 G3 G2 G1 G0
B LED OUTPUTS
B7 B6 B5 B4 B3 B2 B1 B0 EXT. PNP
MUX0
8-BIT
OUTPUT R CALDAC
ISET
R LED DRIVERS
R7–R0
8-BIT
G CALDAC
ISET
G LED DRIVERS
G7–G0
8-BIT
B CALDAC
ISET B LED DRIVERS
B7–B0
MUX1
OUTPUTS
PWM
COUNTERS
SYNC
CONTROL
8
0/1
8
7-BIT GLOBAL-INTENSITY PDM MODULATOR
12-BIT INDIVIDUAL PWM MODULATOR
288
8 888
24
CALIBRATION
7 DATA LATCH
GLOBAL-
INTENSITY
7 DATA LATCH
7
LOAD
OE
288
MUX0 PIXEL PWM OLD DATA LATCH
288
LOAD
OE
288
MUX1 PIXEL PWM OLD DATA LATCH
288
EN MUX0 PIXEL PWM NEW DATA LATCH
MUX1 PIXEL PWM NEW DATA LATCH EN
288 288
LOADI
CLKI
DIN
SYNC DETECT
D Q1
288
MAX6974
288-BIT DATA SHIFT REGISTER
24-BIT NEW HEADER
SHIFT REGISTER
LOADO
CLKO
DOUT
6 _______________________________________________________________________________________

6 Page



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