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MAX6966 の電気的特性と機能

MAX6966のメーカーはMaxim Integratedです、この部品の機能は「10-Port Constant-Current LED Drivers and I/O Expanders」です。


製品の詳細 ( Datasheet PDF )

部品番号 MAX6966
部品説明 10-Port Constant-Current LED Drivers and I/O Expanders
メーカ Maxim Integrated
ロゴ Maxim Integrated ロゴ 




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MAX6966 Datasheet, MAX6966 PDF,ピン配置, 機能
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 pdf, ピン配列
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, TA = TMIN to TMAX, unless otherwise noted. Typical values are at V+ = 3.3V, TA =
+25°C.) (Note 1)
PARAMETER
SYMBOL
CONDITIONS
MIN TYP MAX UNITS
Input High Voltage
(P0–P9, DIN, SCLK, CS, OSC)
VIH P0–P9: output register set to 0x01
0.7 x
V+
V
Input Low Voltage
(P0–P9, DIN, SCLK, CS, OSC)
VIL P0–P9: output register set to 0x01
0.3 x
V+
V
Input Leakage Current
(P0–P9, DIN, SCLK, CS, OSC)
IIH, IIL
-0.2
+0.2
µA
Input Capacitance
(P0–P9, DIN, SCLK, CS, OSC)
(Note 2)
10 pF
Port Nominal Sink Constant
Current
(P0–P9) (Global Current Register
Set to 0x07)
IOUT
Output register set to
0x02,
V+ = 3.3V, VEXT - VLED =
1V to 2.5V (Note 3)
TA = +25°C
TA = TMIN to
+85°C
19.3 20 21.1
9.5 10 10.7
mA
18.8 21.8
9.1 11.0
Port Logic Output Low Voltage
(P0–P9)
VOLP_
Output register set to 0x00,
ISINK = 0.5mA
0.4 V
Port Logic Output Low Short-
Circuit Current (P0–P9)
Port Slew Time
Output register set to 0x00,
VOLP_ = 5V
From 20% current to 80% current
10.8 20
2
mA
µs
Port Sink Constant-Current
Matching
IOUT
TA = +25°C, V+ = 3.3V, VEXT - VLED = 1.4V,
IOUT = 20mA
TA = +25°C, V+ = 3.3V, VEXT - VLED = 1.4V,
IOUT = 10mA
±1.5 ±4
±2 ±5
%
Output High Voltage
(DOUT)
VOHDOUT ISOURCE = 6mA
V+ -
0.3V
V
Output Low Voltage
(DOUT)
VOLDOUT ISINK = 6mA
0.3 V
Maxim Integrated
3


3Pages


MAX6966 電子部品, 半導体
MAX6966/MAX6967
10-Port Constant-Current LED Drivers and I/O
Expanders with PWM Intensity Control
Pin Description
PIN
QSOP TQFN
1 15
2 16
3–7,
9-13
8
1–5,
7-11
6
14 12
15 13
16 14
— PAD
NAME
FUNCTION
SCLK
CS
Serial-Clock Input. On SCLK’s rising edge, data shifts into the internal shift register. On SCLK’s
falling edge, data is clocked out of DOUT. SCLK is active only while CS is low.
Chip-Select Input. Serial data is loaded into the shift register while CS is low. The most recent 16
bits of data latch on CS’s rising edge.
P0-P9
I/O Ports. P0 to P9 can be configured as open-drain current-sink outputs rated at 20mA
maximum, or as CMOS-logic inputs, or as open-drain logic outputs. Loads should be connected
to a supply voltage no higher than 7V.
GND Ground
DOUT/OSC
Serial-Data Output. The data into DIN is valid at DOUT 15.5 clock cycles later. Use this pin to
daisy-chain several devices or allow data readback. Output is push-pull.
OSC Input. Apply a square-wave CMOS clock up to 100kHz as alternate PWM clock source.
The MAX6966 powers up with DOUT/OSC defaulting as DOUT output.
The MAX6967 powers up with DOUT/OSC defaulting as OSC input.
DIN
Serial-Data Input. Data from DIN loads into the internal 16-bit shift register on SCLK’s rising
edge.
V+ Positive Supply Voltage. Bypass V+ to GND with a 0.1µF ceramic capacitor.
Exposed
pad
Exposed Pad on Package Underside. Connect to GND.
Quick-Start Guide
This section describes how to configure a MAX6966 or
MAX6967 on power-up.
Software engineers can use this section as a plain-text
guide to the device’s initialization routine. Hardware
engineers can use this section to get a quick overview
of the device’s capabilities and feature tradeoffs:
1) Before power-up, all 10 I/O ports P0 to P9 are high
impedance. They may be connected to inputs up to
+7V or loads connected to independent rails up to
+7V. The SPI bus inputs (SCLK, CS, DIN) are not
overvoltage protected, and must not be driven from
a voltage higher than V+.
2) After power-up, all 10 I/O ports P0 to P9 remain
high impedance. They may be connected to inputs
up to +7V or loads connected to V+ or independent
rails up to +7V. The ports are not configured as logic
inputs even though the ports are high impedance.
The device is in shutdown mode, and draws mini-
mum supply current regardless of I/O ports connec-
tions.
3) Decide whether the DOUT/OSC pin will be used
as SPI data output or PWM clock input, and
choose the MAX6966 or MAX6967 accordingly. If
any ports are used as logic input, or if the applica-
tion needs read-after-write validation, then
DOUT/OSC needs to be configured as DOUT. Note
that both the MAX6966 and MAX6967 can configure
DOUT/OSC as either DOUT output or OSC clock
input; the only difference is the power-up default.
4) Allocate port functionality for the 10 I/O ports. All
ports have the same features, so allocate ports for
either software convenience or board-routing rea-
sons. Any port can be constant-current LED drivers
(static or PWM), an open-drain logic output, or a
logic input. If fewer than 10 ports are used as con-
stant-current drivers, see the Applications
Information section for details on how to optimize the
PWM phasing to minimize load supply-current mod-
ulation.
5) Decide how to implement LED intensity control.
The MAX6966/MAX6967 provide:
• Individual 8-bit PWM control per constant-current
output
• Individual 1-bit analog control (half/full) per
constant-current output
• Global 3-bit analog control, which applies to all
constant-current outputs
6 Maxim Integrated

6 Page



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