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PDF MAX7322 Data sheet ( Hoja de datos )
| Número de pieza | MAX7322 | |
| Descripción | I2C Port Expander | |
| Fabricantes | Maxim Integrated | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de MAX7322 (archivo pdf) en la parte inferior de esta página. Total 16 Páginas | ||
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MAX7322
EVALUATION KIT AVAILABLE
I2C Port Expander with
4 Push-Pull Outputs and 4 Inputs
General Description
The MAX7322 2-wire serial-interfaced peripheral features
four push-pull outputs and four input ports with selectable
internal pullups. Input ports are overvoltage protected to
+6V and feature transition detection with interrupt output.
The four input ports are continuously monitored for state
changes (transition detection). The interrupt is latched,
allowing detection of transient changes. Any combination
of inputs can be selected using the interrupt mask to
assert the open-drain INT output. When the MAX7322 is
subsequently accessed through the serial interface, any
pending interrupt is cleared.
The four push-pull outputs are rated to sink 20mA, and
are capable of driving LEDs.
The RST input clears the serial interface, terminating any
I2C communication to or from the MAX7322.
The MAX7322 uses two address inputs with four-level
logic to allow 16 I2C slave addresses. The slave address
also sets the power-up default logic state for the four out-
put ports, and enables or disables internal 40kΩ pullups
for the input ports.
The MAX7322 is one device in a family of pin-compatible
port expanders with a choice of input ports, open-drain I/O
ports, and push-pull output ports (see Table 1).
The MAX7322 is available in 16-pin QSOP and TQFN
packages, and is specified over the -40°C to +125°C
automotive temperature range.
Applications
●● Cell Phones
●● SAN/NAS
●● Servers
●● Notebooks
●● Satellite Radio
Pin Configurations
TOP VIEW
12 11 10 9
SDA 13
8 I5
V+ 14
AD0 15
MAX7322
7 I4
6 GND
RST 16 + *EP
5 I3
1234
TQFN
(3mm x 3mm)
Pin Configurations continued at end of data sheet.
Features
●● 400kHz I2C Serial Interface
●● +1.71V to +5.5V Operation Voltage
●● 4 Push-Pull Output Ports Rated at 20mA Sink
Current
●● 4 Input Ports with Maskable, Latching Transition
Detection
●● Input Ports are Overvoltage Protected to +6V
●● Transient Changes are Latched, Allowing
Detection Between Read Operations
●● INT Output Alerts Change on Any Selection of Inputs
●● AD0 and AD2 Inputs Select from 16 Slave Addresses
●● Low 0.6µA (typ) Standby Current
●● -40°C to +125°C Operating Temperature Range
Ordering Information
PART
TEMP RANGE PIN-PACKAGE
MAX7322AEE+ -40°C to +125°C 16 QSOP
MAX7322ATE+
-40°C to +125°C
16 TQFN-EP*
(3mm x 3mm)
+Denotes a lead(Pb)-free/RoHS-compliant package.
*EP = Exposed pad.
TOP
MARK
—
ADD
Selector Guide
PART
INPUTS
INTERRUPT
MASK
OPEN-
DRAIN
OUTPUTS
PUSH-PULL
OUTPUTS
MAX7319
MAX7320
MAX7321
MAX7322
MAX7323
MAX7328
MAX7329
8
—
Up to 8
4
Up to 4
Up to 8
Up to 8
Yes
—
—
Yes
—
—
—
—
—
Up to 8
—
Up to 4
Up to 8
Up to 8
—
8
—
4
4
—
—
Typical Application Circuit and Functional Diagram appear
at end of data sheet.
19-3787; Rev 2; 5/14
1 page  
MAX7322
I2C Port Expander with
4 Push-Pull Outputs and 4 Inputs
Detailed Description
MAX7319–MAX7329 Family Comparison
The MAX7319–MAX7323 family consists of five pin-
compatible, eight-port expanders. Each version is
optimized for different applications. The MAX7328 and
MAX7329 are industry-standard parts.
The MAX7324–MAX7327 family consists of four pin-
compatible, 16-port expanders that integrate the
func-tions of the MAX7320 and one of either MAX7319,
MAX7321, MAX7322, or MAX7323.
Functional Overview
The MAX7322 is a general-purpose port expander
operating from +1.71V to +5.5V supply that provides
four push-pull output ports with 20mA sink, 10mA source
drive capability, and four input ports that are overvoltage
protected to +6V independent of supply voltage. The
MAX7322 is rated to sink a total of 100mA and source a
total of 50mA from all four combined outputs.
The MAX7322 is set to one of 16 I2C slave addresses
(0x60 to 0x6F) using address inputs AD2 and AD0, and
is accessed over an I2C serial interface up to 400kHz.
The RST input clears the serial interface in case of a
bus lockup, terminating any serial transaction to or from
the MAX7322.
Table 1. MAX7319–MAX7329 Family Comparison
PART
I2C INPUT
SLAVE INPUTS INTERRUPT
ADDRESS
MASK
OPEN-
DRAIN
OUTPUTS
PUSH-
PULL
OUTPUTS
8-PORT EXPANDERS
I2C DATA
WRITE
I2C DATA
READ
APPLICATION
Input-only versions:
8 input ports with
programmable latching
transition detection interrupt
and selectable pullups.
<I7–I0 port Offers maximum versatility
<I7–I0
inputs> for automatic input
MAX7319 110xxxx
8
Yes
—
—
Interrupt
<I7–I0 monitoring. An interrupt
mask> Transition mask selects which inputs
flags> cause an interrupt on
transitions, and transition
flags identify which inputs
have changed (even
momentarily) since the
ports were last read.
Output-only versions:
8 push-pull outputs with
MAX7320 101xxxx
—
—
—
8
<O7–O0
Port
outputs>
selectable power-up default
<O7-O0 levels.
port inputs> Push-pull outputs offer
faster rise time than open-
drain outputs, and require
no pullup resistors.
www.maximintegrated.com
Maxim Integrated │ 5
5 Page 
MAX7322
I2C Port Expander with
4 Push-Pull Outputs and 4 Inputs
Slave Address
The MAX7322 has a 7-bit-long slave address (Figure 5).
The eighth bit following the 7-bit slave address is the R/W
bit. It is low for a write command, and high for a read
command.
The first (A6), second (A5), and third (A4) bits of the
MAX7322 slave address are always 1, 1, and 0. Connect
AD2 and AD0 to GND, V+, SDA, or SCL to select slave
address bits A3, A2, A1, and A0. The MAX7322 has 16
possible slave addresses (Table 2), allowing up to 16
MAX7322 devices on an I2C bus.
Accessing the MAX7322
The MAX7322 is accessed through an I2C interface.
The transition flags are cleared, and INT is
deasserted each time the device acknowledges the I2C slave
address.
A single-byte read from the MAX7322 returns the status
of the four input ports and the four output ports (read back
as inputs).
A 2-byte read returns the status of the four input ports and
the four output ports (as for a single-byte read), followed
by the transition flags for the four input ports.
A multibyte read (more than 2 bytes before the I2C
STOP bit) repeatedly returns the port data, alternating
with the transition flags. As the data is resampled for each
transmission, and the transition flags are reset each time,
a multibyte read continuously returns the current data and
identifies any changing ports.
If a port data change occurs during the read sequence,
INT is reasserted after the I2C STOP bit. The MAX7322
does not generate another interrupt during a single-byte
or multibyte read.
Port data is sampled during the preceding I2C
acknowledge bit (the acknowledge bit for the I2C slave
address in the case of a single-byte or 2-byte read).
A single-byte write to the MAX7322 sets the logic state
of the four output ports and the 4-bit interrupt mask
resistor, and clears both the internal transition flags and
the INT output when the device acknowledges the slave
address byte.
A multibyte write to the MAX7322 repeatedly sets the
logic state of the four output ports and the 4-bit interrupt
mask register.
SDA 1
MSB
SCL
Figure 5. Slave Address
1
0
A3
A2 A1
A0 R/W
ACK
LSB
www.maximintegrated.com
Maxim Integrated │ 11
11 Page | ||
| Páginas | Total 16 Páginas | |
| PDF Descargar | [ Datasheet MAX7322.PDF ] | |
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