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MAX7315 Datasheet

  • MAX7315

  • 8端口輸入/輸出擴(kuò)展器，帶有LED亮度控制和中斷，提供熱插入保護(hù)

  • 26頁

  • MAXIM   MAXIM

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19-3056; Rev 1; 2/04
8-Port I/O Expander with LED Intensity
Control and Interrupt
General Description
The MAX7315
serial interfaced
peripheral provides microprocessors with 8 I/O ports.
Each I/O port can be individually configured as either an
open-drain current-sinking output rated at 50mA at 5.5V,
or a logic input with transition detection. A ninth port can
be used for transition detection interrupt or as a general-
purpose output. The outputs are capable of directly dri-
ving LEDs, or providing logic outputs with external
resistive pullup up to 5.5V.
PWM current drive is integrated with 8 bits of control.
Four bits are global control and apply to all LED outputs
to provide coarse adjustment of current from fully off to
fully on in 14 intensity steps. Each output then has indi-
vidual 4-bit control, which further divides the globally
set current into 16 more steps. Alternatively, the current
control can be configured as a single 8-bit control that
sets all outputs at once.
The MAX7315 is pin and software compatible with the
PCA9534 and PCA9554(A).
Each output has independent blink timing with two blink
phases. All LEDs can be individually set to be on or off
during either blink phase, or to ignore the blink control.
The blink period is controlled by a register.
The MAX7315 is controlled through the 2-wire I
2
C/SMBus
serial interface, and can be configured to one of 64 I
2
C
addresses.
I
2
C鈩?/SMBus-compatible
Features
鈾?/div>
400kbps, 2-Wire Serial Interface, 5.5V Tolerant
鈾?/div>
2V to 3.6V Operation
鈾?/div>
Overall 8-Bit PWM LED Intensity Control
Global 16-Step Intensity Control
Plus Individual 16-Step Intensity Control
鈾?/div>
Automatic Two-Phase LED Blinking
鈾?/div>
50mA Maximum Port Output Current
鈾?/div>
Outputs Are 5.5V-Rated Open Drain
鈾?/div>
Inputs Are Overvoltage Protected to 5.5V
鈾?/div>
Transition Detection with Interrupt Output
鈾?/div>
Low Standby Current (1.2碌A(chǔ) typ; 3.3碌A(chǔ) max)
鈾?/div>
Tiny 3mm x 3mm, Thin QFN Package
鈾?/div>
-40擄C to +125擄C Temperature Range
鈾?/div>
All Ports Can Be Configured as Inputs or Outputs
MAX7315
Ordering Information
PART
MAX7315ATE
MAX7315AEE
MAX7315AUE
TEMP RANGE
-40擄C to +125擄C
-40擄C to +125擄C
-40擄C to +125擄C
PIN-PACKAGE
16 Thin QFN
3mm x 3mm x
0.8mm
16 QSOP
16 TSSOP
TOP
MARK
AAU
鈥?/div>
鈥?/div>
Applications
LCD Backlights
LED Status Indication
Portable Equipment
Laptop Computers
Keypad Backlights
RGB LED Drivers
Cellular Phones
Typical Application Circuit
5V
3.3V
Pin Configurations
SDA
0.047碌F
V+
SDA
SCL
P0
P1
SDA
AD0
AD1
TOP VIEW
碌C
V+
16
AD2
P0
P1
P2
1
2
3
4
5
P3
15
14
13
12
11
SCL
INT/O8
P7
P6
MAX7315
P2
P3
P4
P5
INPUT 1
INPUT 2
5V 3.3V
SCL
I/O
INT/O8
AD0
AD1
AD2
P6
P7
MAX7315ATE
10
9
OUTPUT1
GND
OUTPUT2
6
GND
7
P4
8
QFN
Pin Configurations continued at end of data sheet.
Purchase of I
2
C components of Maxim Integrated Products, Inc.,
or one of its sublicensed Associated Companies, conveys a
license under the Philips I
2
C Patent Rights to use these compo-
nents in an I
2
C system, provided that the system conforms to the
I
2
C Standard Specification as defined by Philips.
1
________________________________________________________________
Maxim Integrated Products
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim鈥檚 website at www.maxim-ic.com.
P5

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