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PDF MAX6967 Data sheet ( Hoja de datos )
| Número de pieza | MAX6967 | |
| Descripción | 10-Port Constant-Current LED Drivers and I/O Expanders | |
| Fabricantes | Maxim Integrated | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de MAX6967 (archivo pdf) en la parte inferior de esta página. Total 29 Páginas | ||
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EVALUATION KIT AVAILABLE
AVAILABLE
MAX6966/MAX6967
10-Port Constant-Current LED Drivers and I/O
Expanders with PWM Intensity Control
General Description
The MAX6966/MAX6967 serial-interfaced peripherals
provide microprocessors with 10 I/O ports rated to 7V.
Each port can be individually configured as either:
• A 20mA constant-current LED driver (static or pulse-
width modulated (PWM)).
• A 10mA constant-current LED driver (static or PWM).
• An open-drain logic output.
• An overvoltage-protected Schmitt logic input.
Analog and switching LED intensity control is built in:
• Individual 8-bit PWM control per output.
• Individual 1-bit analog control (half/full) per output.
• Global 3-bit analog control applies to all LED outputs.
PWM timing of the 10 port outputs may be optionally
staggered, consecutively phased in 45° increments.
This spreads the PWM load currents over time in eight
steps, helping to even out the power-supply current
and reduce the RMS current.
The MAX6966/MAX6967 can be configured to awake
from shutdown on receipt of a minimum 3ms pulse on
the CS input. This hardware-wakeup feature allows a
power-management controller or similar ASIC to enable
the MAX6966/MAX6967 with preconfigured LED intensi-
ty settings.
Shutdown can be programmed to wait up to 4s, fade
d4so,wanntdhethseinnkshcuutrrednotwsFnt.uoAnzecsriomtiiflooarrnaraapmleprDi-oudipaofgrfo1rm/a16smhsustto-
down can be programmed for 1/16s to 4s.
The MAX6966/MAX6967 support hot insertion. All port
pins remain high impedance in power-down (V+ = 0V)
with up to 8V asserted on them.
The DOUT/OSC pin can be configured as either the
serial interface data output or optional PWM clock
input. The MAX6966 powers up defaulting as DOUT
output. The MAX6967 defaults as OSC input.
For a similar part without the constant-current controls,
refer to the MAX7317 data sheet.
Applications
LCD Backlights
RGB LED Drivers
Keypad Backlights
Portable Equipment
LED Status Indication Cellular Phones
Pin Configurations appear at end of data sheet.
SFPuInacntdionQaSlPDIiaargeratrmadsecmoanrtkinsuoefdMaottoernodlao, fIndca.ta sheet.
UCSP is a trademark of Maxim Integrated Products, Inc.
MICROWIRE is a trademark of National Semiconductor Corp.
Features
♦ High-Speed 26MHz SPI-™/QSPI-™/MICROWIRE™-
Compatible Serial Interface
♦ 2.25V to 3.6V Operation
♦ I/O Ports Default to High-Z (LEDs Off) on Power-Up
♦ I/O Port Inputs Are Overvoltage Protected to 7V
♦ I/O Port Outputs Are 7V-Rated Open Drain
♦ I/O Port Outputs Are 10mA or 20mA Constant-
Current Static/PWM LED Drivers, or Open-Drain
Logic Outputs
♦ I/O Ports Support Hot Insertion
♦ Individual 8-Bit PWM Intensity Control for Each LED
♦ Any Output May Use or Not Use PWM Control
♦ Exit Shutdown (Warm Start) with Simple CS Pulse
♦ Auto Ramp-Down into Shutdown
♦ Auto Ramp-Up Out from Shutdown
♦ 0.8µA (typ), 2µA (max) Shutdown Current
♦ Tiny 3mm x 3mm, 0.8mm High Thin QFN Package
♦ -40°C to +125°C TeOmpredraeturrienRganIgneformation
Ordering Information
PART
TEMP PIN-
RANGE PACKAGE
TOP PKG
MARK CODE
MAX6966ATE
-40°C to
+125°C
16 Thin QFN
3mm x 3mm x
0.8mm
ACF
T1633-4
MAX6966AEE
MAX6967ATE
-40°C to
+125°C
-40°C to
+125°C
16 QSOP
16 Thin QFN
3mm x 3mm x
0.8mm
—
ACG
—
T1633-4
MAX6967AEE
-40°C to
+125°C
16 QSOP
——
For pricing, delivery, and ordering information, please contact Maxim Direct
at 1-888-629-4642, or visit Maxim’s website at www.maximintegrated.com.
19-3487; Rev 2; 4/05
1 page  
MAX6966/MAX6967
10-Port Constant-Current LED Drivers and I/O
Expanders with PWM Intensity Control
(TA = +25°C, unless otherwise noted.)
Typical Operating Characteristics
STANDBY CURRENT (ISTBY1)
vs. TEMPERATURE
1.2
1.1
1.0 V+ = 3.6V
V+ = 3.3V
0.9
V+ = 2.7V
0.8
0.7
0.6
0.5 V+ = 2.25V
0.4
-40 -25 -10 5 20 35 50 65 80 95 110 125
TEMPERATURE (°C)
SUPPLY CURRENT (I+)
vs. TEMPERATURE
0.5
V+ = 3.6V
0.4 V+ = 3.3V
0.3
V+ = 2.7V
0.2
V+ = 2.25V
0.1
0
-40 -25 -10 5 20 35 50 65 80 95 110 125
TEMPERATURE (°C)
OUTPUT SINKING CURRENT
vs. VEXT - VLED AT 10mA
14
12
10
8
6
4
2
0
01234
VEXT - VLED (V)
OUTPUT SINKING CURRENT
vs. VEXT - VLED AT 20mA
24
20
16
12
8
4
0
012345
VEXT - VLED (V)
INTERNAL OSCILLATOR FREQUENCY
vs. TEMPERATURE
45
43
41 V+ = 3.6V V+ = 3.3V
39
37
35
33
V+ = 2.7V
V+ = 2.25V
31
29
27
-40 -25 -10 5 20 35 50 65 80 95 110 125
TEMPERATURE (°C)
5
OUTPUT
REGISTER
= 0x03
OUTPUT
REGISTER
= 0x80
SAMPLE PWM WAVEFORMS
MAX6966/67 toc06
STAGGER PWM PORT WAVEFORMS
(OUTPUT REGISTERS SET TO 0x80)
MAX6966/67 toc07
PORT P4
PORT P0
OUTPUT
REGISTER
= 0xFE
PORT P1
2ms 2ms
Maxim Integrated
5
5 Page 
MAX6966/MAX6967
10-Port Constant-Current LED Drivers and I/O
Expanders with PWM Intensity Control
Initial Power-Up
On power-up, all control registers are reset (Table 3).
Power-up status sets I/O ports P0 to P9 high imped-
ance, and puts the device into shutdown mode. This
means that any LED (or other) loads are effectively
turned off, and the MAX6966/MAX6967 start in its low-
est power condition.
PWM Clock
An internal 32kHz oscillator generates PWM timing. If
all output ports are set to static levels, the internal oscil-
lator and PWM logic are disabled automatically, and
the MAX6966/MAX6967 operating current is lowest.
The internal 32kHz oscillator can be replaced by a user
clock up to 100kHz if a precise or synchronized PWM
frequency source is desired. The clock is fed into the
dual-use DOUT/OSC pin, which is switched between a
port output and a clock input using the OSC bit in the
configuration register (Table 4).
Table 3. Initial Power-Up Register Status
REGISTER
Port P0 output level or PWM
Port P1 output level or PWM
Port P2 output level or PWM
Port P3 output level or PWM
Port P4 output level or PWM
Port P5 output level or PWM
Port P6 output level or PWM
Port P7 output level or PWM
Port P8 output level or PWM
Port P9 output level or PWM
POWER-UP CONDITION
Port 0 high impedance
Port 1 high impedance
Port 2 high impedance
Port 3 high impedance
Port 4 high impedance
Port 5 high impedance
Port 6 high impedance
Port 7 high impedance
Port 8 high impedance
Port 9 high impedance
ADDRESS
REGISTER DATA
CODE (HEX)
D7 D6 D5 D4 D3 D2 D1 D0
0x00
1 1 111111
0x01
1 1 111111
0x02
1 1 111111
0x03
1 1 111111
0x04
1 1 111111
0x05
1 1 111111
0x06
1 1 111111
0x07
1 1 111111
0x08
1 1 111111
0x09
1 1 111111
Configuration (MAX6966
only)
Configuration (MAX6967
only)
Shutdown mode,
CS run disabled,
DOUT/OSC is DOUT output
Shutdown mode,
CS run disabled,
DOUT/OSC is OSC input
0x10
0
0 000000
1
Ramp-down
Ramp-up
Output current ISET70
Output current ISET98
Global current
Fade disabled
—
IPEAK = 10mA for ports P7–P0
IPEAK = 10mA for ports P9, P8
Full current
0x11
0x12
0x13
0x14
0x15
0 0 000000
0 0 000000
0 0 000000
0 0 000000
0 0 000111
Maxim Integrated
11
11 Page | ||
| Páginas | Total 29 Páginas | |
| PDF Descargar | [ Datasheet MAX6967.PDF ] | |
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