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
down the sink currents to zero for a period of 1/16s to
Functional Diagrams
4s, and then shut down. A similar ramp-up from shut-
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.
AVAILAB
LE
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
Ordering Information
♦
-40°C to +125°C Temperature Range
Ordering Information
PART
TEMP
RANGE
-40°C to
+125°C
-40°C to
+125°C
-40°C to
+125°C
-40°C to
+125°C
PIN-
PACKAGE
16 Thin QFN
3mm x 3mm x
0.8mm
16 QSOP
16 Thin QFN
3mm x 3mm x
0.8mm
16 QSOP
TOP
MARK
ACF
PKG
CODE
T1633-4
MAX6966ATE
MAX6966AEE
—
—
MAX6967ATE
ACG
T1633-4
Applications
LCD Backlights
Keypad Backlights
LED Status Indication
RGB LED Drivers
Portable Equipment
Cellular Phones
MAX6967AEE
—
—
Pin Configurations appear at end of data sheet.
Functional Diagrams continued at end of data sheet.
SPI and QSPI are trademarks of Motorola, Inc.
UCSP is a trademark of Maxim Integrated Products, Inc.
MICROWIRE is a trademark of National Semiconductor Corp.
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
MAX6966/MAX6967
10-Port Constant-Current LED Drivers and I/O
Expanders with PWM Intensity Control
ABSOLUTE MAXIMUM RATINGS
Voltage (with respect to GND)
V+ .............................................................................-0.3V to +4V
SCLK, DIN,
CS,
DOUT/OSC.........................-0.3V to (V+ + 0.3V)
P_ .............................................................................-0.3V to +8V
DC Current into P_ .............................................................24mA
DC Current into DOUT/OSC................................................10mA
Total GND Current ............................................................280mA
Continuous Power Dissipation
16-Pin QSOP (derate 8.3mW/°C over T
A
= +70°C) ....667mW
16-Pin QFN (derate 14.7mW/°C over T
A
= +70°C)...1176mW
Operating Temperature Range (T
MIN
to T
MAX
) .-40°C to +125°C
Junction Temperature ......................................................+150°C
Storage Temperature Range .............................-65°C to +150°C
Lead Temperature (soldering, 10s) .................................+300°C
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.
ELECTRICAL CHARACTERISTICS
(Typical
Operating Circuit,
V+ = 2.25V to 3.6V, T
A
= T
MIN
to T
MAX
, unless otherwise noted. Typical values are at V+ = 3.3V, T
A
=
+25°C.) (Note 1)
PARAMETER
Operating Supply Voltage
Output Load External Supply
Voltage P0–P9
Standby Current
(Interface Idle, CS Run Disabled,
PWM Disabled, All Ports High
Impedance)
Supply-Current Interface Only
(CS Run Enabled, PWM
Disabled, All Ports High
Impedance)
Delta Supply Current per 10mA
Port (Interface Idle, Global
Current Register Set to 0x07, One
Port's Output Register Set to
0x02 and Its Output Current
Register Bit Cleared; All Other
Ports’ Output Registers Set to
0x00, 0x01, or 0xFF)
Delta Supply Current per 20mA
Port
(Interface Idle, Global Current
Register Set to 0x07, One Port's
Output Register Set to 0x02 and Its
Output Current Register Bit Set; All
Other Ports’ Output Registers Set to
0x00, 0x01, or 0xFF)
SYMBOL
V+
V
EXT
T
A
= +25°C
I
STBY
CS
at V+; other digital
inputs at V+ or GND
T
A
= T
MIN
to +85°C
T
A
= T
MIN
to T
MAX
f
SCLK
= 26MHz, other
digital inputs at V+ or
GND; DOUT unloaded
T
A
= +25°C
T
A
= T
MIN
to +85°C
T
A
= T
MIN
to T
MAX
T
A
= +25°C
∆I
+10
Digital inputs at V+ or
GND
1.58
390
0.7
CONDITIONS
MIN
2.25
TYP
MAX
3.60
7
1.5
1.7
1.9
620
680
730
1.8
µA
µA
UNITS
V
V
I
+
T
A
= T
MIN
to +85°C
1.9
mA
T
A
= T
MIN
to T
MAX
2
T
A
= +25°C
∆I
+20
Digital inputs at V+ or
GND
T
A
= T
MIN
to +85°C
3.2
3.6
3.8
mA
T
A
= T
MIN
to T
MAX
4.0
2
Maxim Integrated
MAX6966/MAX6967
10-Port Constant-Current LED Drivers and I/O
Expanders with PWM Intensity Control
ELECTRICAL CHARACTERISTICS (continued)
(Typical
Operating Circuit,
V+ = 2.25V to 3.6V, T
A
= T
MIN
to T
MAX
, unless otherwise noted. Typical values are at V+ = 3.3V, T
A
=
+25°C.) (Note 1)
PARAMETER
Input High Voltage
(P0–P9, DIN, SCLK,
CS,
OSC)
Input Low Voltage
(P0–P9, DIN, SCLK,
CS,
OSC)
Input Leakage Current
(P0–P9, DIN, SCLK,
CS,
OSC)
Input Capacitance
(P0–P9, DIN, SCLK,
CS,
OSC)
Port Nominal Sink Constant
Current
(P0–P9) (Global Current Register
Set to 0x07)
Port Logic Output Low Voltage
(P0–P9)
Port Logic Output Low Short-
Circuit Current (P0–P9)
Port Slew Time
Port Sink Constant-Current
Matching
SYMBOL
V
IH
V
IL
I
IH
, I
IL
(Note 2)
Output register set to
0x02,
V+ = 3.3V, V
EXT
- V
LED
=
1V to 2.5V (Note 3)
Output register set to 0x00,
I
SINK
= 0.5mA
Output register set to 0x00,
V
OLP_
= 5V
From 20% current to 80% current
T
A
= +25°C, V+ = 3.3V, V
EXT
- V
LED
= 1.4V,
I
OUT
= 20mA
T
A
= +25°C, V+ = 3.3V, V
EXT
- V
LED
= 1.4V,
I
OUT
= 10mA
I
SOURCE
= 6mA
I
SINK
= 6mA
V+ -
0.3V
0.3
10.8
2
±1.5
±2
±4
%
±5
V
V
T
A
= +25°C
T
A
= T
MIN
to
+85°C
19.3
9.5
18.8
9.1
CONDITIONS
P0–P9: output register set to 0x01
P0–P9: output register set to 0x01
-0.2
10
20
10
21.1
10.7
21.8
11.0
0.4
20
V
mA
µs
mA
MIN
0.7 x
V+
0.3 x
V+
+0.2
TYP
MAX
UNITS
V
V
µA
pF
I
OUT
V
OLP_
∆I
OUT
Output High Voltage
(DOUT)
Output Low Voltage
(DOUT)
V
OHDOUT
V
OLDOUT
Maxim Integrated
3
MAX6966/MAX6967
10-Port Constant-Current LED Drivers and I/O
Expanders with PWM Intensity Control
TIMING CHARACTERISTICS
(Typical
Operating Circuit,
V+ = 2.25V to 3.6V, T
A
= T
MIN
to T
MAX
, unless otherwise noted. Typical values are at V+ = 3.3V, T
A
=
+25°C.) (Note 1)
PARAMETER
Internal PWM Clock Frequency
External PWM Clock Frequency
SCLK Clock Period
SCLK Pulse Width High
SCLK Pulse Width Low
CS
Fall to SCLK Rise Setup Time
SCLK Rise to
CS
Rise Hold Time
DIN Setup Time
DIN Hold Time
Output Data Propagation Delay
DOUT Output Rise and Fall
Times
Minimum
CS
Pulse High
CS
Pulse Low to Not Activate CS
Run
CS
Pulse Width to Activate CS
Run
SYMBOL
f
INT
f
OSC
t
CP
t
CH
t
CL
t
CSS
t
CSH
t
DS
t
DH
t
DO
t
FT
t
CSW
t
CSRUN
t
CSRUN
CS run enabled
CS run enabled
3
C
LOAD
= 20pF
38.4
640
38.4
19
19
9.5
0
9.5
0
21
10
CONDITIONS
MIN
27000
TYP
MAX
45000
100
UNITS
Hz
kHz
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
µs
ms
Note 1:
All parameters tested at T
A
= +25°C. Specifications over temperature are guaranteed by design.
Note 2:
Guaranteed by design.
Note 3:
Port current is factory trimmed to meet a median sink current of 20mA and 10mA over all 10 ports. The
射频识别(Radio Frequency Identification，RFID)技术是一种利用无线射频通信实现的非接触式自动识别技术，与目前广泛采用的条形码技术相比，RFID具有容量大、识别距离远、穿透能力强、抗污性强等特点。RFID技术已经发展得比较成熟并获得了大规模商用，但超高频RFID技术相对滞后。本文分析了射频芯片nRF9E5的功能特性，并将其用于RFID系统中，设计了一套有源超高频(...[详细]
嵌入式系统
京公网安备 11010802033920号
Copyright © 2005-2026 EEWORLD.com.cn, Inc. All rights reserved
电子工程世界
