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PDF MAX7313 Data sheet ( Hoja de datos )
| Número de pieza | MAX7313 | |
| Descripción | 16-Port I/O Expander | |
| Fabricantes | Maxim Integrated Products | |
| Logotipo |  |
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19-3059; Rev 4; 4/05
16-Port I/O Expander with LED Intensity
Control, Interrupt, and Hot-Insertion Protection
General Description
The MAX7313 I2C™-compatible serial interfaced
peripheral provides microprocessors with 16 I/O ports.
Each I/O port can be individually configured as either
an open-drain current-sinking output rated at 50mA and
5.5V, or a logic input with transition detection. A 17th
port can be used for transition detection interrupt, or as
a general-purpose output. The outputs are capable of
driving 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 with 14 intensity steps. Each output then has
individual 4-bit control, which further divides the global-
ly set current into 16 more steps. Alternatively, the cur-
rent control can be configured as a single 8-bit control
that sets all outputs at once.
The MAX7313 is pin and software compatible with the
MAX7311, PCA9535, and PCA9555.
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 MAX7313 supports hot insertion. All port pins, the
INT output, SDA, SCL, and the slave-address inputs
ADO-2 remain high impedance in power-down (V+ =0V)
with up to 6V asserted upon them.
The MAX7313 is controlled through the 2-wire
I2C/SMBus serial interface, and can be configured to
any one of 64 I2C addresses.
Applications
LCD Backlights
LED Status Indication
Portable Equipment
Keypad Backlights
RGB LED Drivers
Notebook Computers
Typical Application Circuit appears at end of data sheet.
Purchase of I2C components of Maxim Integrated Products, Inc.,
or one of its sublicensed Associated Companies, conveys a
license under the Philips I2C Patent Rights to use these compo-
nents in an I2C system, provided that the system conforms to the
I2C Standard Specification as defined by Philips.
Features
♦ 400kbs, 2-Wire Serial Interface, 5.5V Tolerant
♦ 2V to 3.6V Operation
♦ Overall 8-Bit PWM LED Intensity Control
Global 16-Step Intensity Control
Individual 16-Step Intensity Controls
♦ Two-Phase LED Blinking
♦ High Output Current (50mA max Per Port)
♦ Outputs are 5.5V-Rated Open Drain
♦ Supports Hot Insertion
♦ Inputs are Overvoltage Protected to 5.5V
♦ Transition Detection with Interrupt Output
♦ 1.2µA (typ), 3.6µA (max) Standby Current
♦ Small 4mm x 4mm Thin QFN Package
♦ -40°C to +125°C Temperature Range
♦ All Ports Can Be Configured as Inputs or Outputs
Ordering Information
PART
TEMP RANGE
PIN-
PACKAGE
PKG
CODE
24 Thin QFN
MAX7313ATG -40°C to +125°C 4mm x 4mm T2444-4
x 0.8mm
MAX7313AEG -40°C to +125°C 24 QSOP
—
Pin Configurations
TOP VIEW
18 17 16 15 14 13
SCL 19
12 P10
SDA 20
11 P9
V+ 21
INT/O16 22
MAX7313ATG
10 P8
9 GND
AD1 23
8 P7
AD2 24
7 P6
12 3456
THIN QFN
Pin Configurations continued at end of data sheet.
________________________________________________________________ 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  
16-Port I/O Expander with LED Intensity
Control, Interrupt, and Hot-Insertion Protection
(TA = +25°C, unless otherwise noted.)
PORT OUTPUT LOW VOLTAGE WITH 50mA
LOAD CURRENT vs. TEMPERATURE
0.6
0.5
0.4 V+ = 2V
V+ = 2.7V
0.3
0.2 V+ = 3.6V
0.1
0
-40 -25 -10 5 20 35 50 65 80 95 110 125
TEMPERATURE (°C)
Typical Operating Characteristics (continued)
PORT OUTPUT LOW VOLTAGE WITH 20mA
LOAD CURRENT vs. TEMPERATURE
0.6
ALL OUTPUTS LOADED
0.5
0.4
0.3 V+ = 2V
0.2
0.1 V+ = 2.7V V+ = 3.6V
0
-40 -25 -10 5 20 35 50 65 80 95 110 125
TEMPERATURE (°C)
PWM CLOCK FREQUENCY
vs. TEMPERATURE
1.050
1.025
1.000
V+ = 3.6V
0.975
0.950
V+ = 2.7V
V+ = 2V
0.925
0.900 NORMALIZED TO V+ = 3.3V, TA = +25°C
-40 -25 -10 5 20 35 50 65 80 95 110 125
TEMPERATURE (°C)
SCOPE SHOT OF 2 OUTPUT PORTS
MAX7313 toc07
MASTER INTENSITY SET TO 1/15
OUTPUT 1
2V/div
OUTPUT 1 INDIVIDUAL INTENSITY
SET TO 1/16
OUTPUT 2 INDIVIDUAL INTENSITY
SET TO 15/16
2ms/div
OUTPUT 2
2V/div
SCOPE SHOT OF 2 OUTPUT PORTS
MAX7313 toc08
MASTER INTENSITY SET TO 14/15
0.35
OUTPUT 1 INDIVIDUAL INTENSITY
SET TO 1/16
OUTPUT 1 0.30
2V/div
0.25
0.20
OUTPUT 2 INDIVIDUAL INTENSITY
SET TO 14/15
2ms/div
0.15
OUTPUT 2
2V/div 0.10
0.05
0
0
SINK CURRENT vs. VOL
V+ = 2V
V+ = 2.7V
V+ = 3.3V
V+ = 3.6V
ONLY ONE OUTPUT LOADED
10 20 30 40
SINK CURRENT (mA)
50
_______________________________________________________________________________________ 5
5 Page 
16-Port I/O Expander with LED Intensity
Control, Interrupt, and Hot-Insertion Protection
COMMAND BYTE IS STORED ON RECEIPT OF
STOP CONDITION
ACKNOWLEDGE FROM MAX7313
D15 D14 D13 D12 D11 D10 D9 D8
S
SLAVE ADDRESS
0A
COMMAND BYTE
AP
R/W ACKNOWLEDGE FROM MAX7313
Figure 7. Command Byte Received
HOW COMMAND BYTE AND DATA BYTE MAP INTO
MAX7313'S REGISTERS
ACKNOWLEDGE FROM MAX7313
ACKNOWLEDGE FROM MAX7313
D15 D14 D13 D12 D11 D10 D9 D8
ACKNOWLEDGE FROM MAX7313
D7 D6 D5 D4 D3 D2 D1 D0
S
SLAVE ADDRESS
0A
COMMAND BYTE
A
DATA BYTE
AP
1
R/W BYTE
AUTOINCREMENT MEMORY ADDRESS
Figure 8. Command and Single Data Byte Received
HOW COMMAND BYTE AND DATA BYTE MAP INTO
MAX7313'S REGISTERS
ACKNOWLEDGE FROM MAX7313
ACKNOWLEDGE FROM MAX7313
D15 D14 D13 D12 D11 D10 D9 D8
ACKNOWLEDGE FROM MAX7313
D7 D6 D5 D4 D3 D2 D1 D0
S
SLAVE ADDRESS
0A
COMMAND BYTE
A
DATA BYTE
AP
N
R/W BYTES
AUTOINCREMENT MEMORY ADDRESS
Figure 9. n Data Bytes Received
Any bytes received after the command byte are data
bytes. The first data byte goes into the internal register
of the MAX7313 selected by the command byte (Figure
8). If multiple data bytes are transmitted before a STOP
condition is detected, these bytes are generally stored
in subsequent MAX7313 internal registers because the
command byte address autoincrements (Table 2). A
diagram of a write to the output ports registers (blink
phase 0 registers or blink phase 1 registers) is given in
Figure 10.
Message Format for Reading
The MAX7313 is read using the MAX7313’s internally
stored command byte as an address pointer the same
way the stored command byte is used as an address
pointer for a write. The pointer autoincrements after
each data byte is read using the same rules as for a
write (Table 2). Thus, a read is initiated by first configur-
ing the MAX7313’s command byte by performing a
write (Figure 7). The master can now read n consecu-
tive bytes from the MAX7313 with the first data byte
being read from the register addressed by the initial-
ized command byte. When performing read-after-write
verification, remember to reset the command byte’s
address because the stored command byte address
has been autoincremented after the write (Table 2). A
diagram of a read from the input ports registers is
shown in Figure 10 reflecting the states of the ports.
Operation with Multiple Masters
If the MAX7313 is operated on a 2-wire interface with
multiple masters, a master reading the MAX7313 should
use a repeated start between the write, which sets the
MAX7313’s address pointer, and the read(s) that takes
the data from the location(s) (Table 2). This is because it
is possible for master 2 to take over the bus after master
1 has set up the MAX7313’s address pointer but before
master 1 has read the data. If master 2 subsequently
changes the MAX7313’s address pointer, then master
1’s delayed read can be from an unexpected location.
______________________________________________________________________________________ 11
11 Page | ||
| Páginas | Total 27 Páginas | |
| PDF Descargar | [ Datasheet MAX7313.PDF ] | |
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