Datasheet

ManualsBrandsMAXIM INTEGRATED ManualsInterface ICsInterface IC - I/O extensions POR I²C 400 kHz TQFN 16 EP

Typical Application Circuit and Functional Diagram appear

at end of data sheet.

Pin Configurations continued at end of data sheet.

● Cell Phones

● SAN/NAS

● Servers

● Notebooks

● Satellite Radio

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

C communication to or from the MAX7322.

The MAX7322 uses two address inputs with four-level

logic to allow 16 I

C 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

Features

● 400kHz I

C 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

+Denotes a lead(Pb)-free/RoHS-compliant package.

*EP = Exposed pad.

PART INPUTS

INTERRUPT

MASK

OPEN-

DRAIN

OUTPUTS

PUSH-PULL

OUTPUTS

MAX7319 8 Yes — —

MAX7320 — — — 8

MAX7321 Up to 8 — Up to 8 —

MAX7322 4 Yes — 4

MAX7323 Up to 4 — Up to 4 4

MAX7328 Up to 8 — Up to 8 —

MAX7329 Up to 8 — Up to 8 —

PART TEMP RANGE PIN-PACKAGE

TOP

MARK

MAX7322AEE+ -40°C to +125°C 16 QSOP —

MAX7322ATE+ -40°C to +125°C

16 TQFN-EP*

(3mm x 3mm)

ADD

AD2

SCL

1 3

V+

12 10 9

AD0

RST

GND

MAX7322

O0 INT

SDA

TQFN

(3mm x 3mm)

TOP VIEW

*EP

MAX7322 I

C Port Expander with

4 Push-Pull Outputs and 4 Inputs

19-3787; Rev 2; 5/14

Selector Guide

Ordering Information

Pin Congurations

EVALUATION KIT AVAILABLE

Summary of content (16 pages)

PAGE 1
EVALUATION KIT AVAILABLE I2C Port Expander with 4 Push-Pull Outputs and 4 Inputs MAX7322 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.
PAGE 2
I2C Port Expander with 4 Push-Pull Outputs and 4 Inputs MAX7322 Absolute Maximum Ratings (All voltages referenced to GND.) Supply Voltage V+....................................................-0.3V to +6V SCL, SDA, AD0, AD2, RST, INT, I2–I5....................-0.3V to +6V O0, O1, O6, O7................................................ -0.3 to V+ + 0.3V O0, O1, O6, O7 Output Current........................................±25mA SDA Sink Current...............................................................
PAGE 3
I2C Port Expander with 4 Push-Pull Outputs and 4 Inputs MAX7322 Port and Interrupt INT Timing Characteristics (V+ = +1.71V to +5.5V, TA = -40°C to +125°C, unless otherwise noted. Typical values are at V+ = +3.3V, TA = +25°C.
PAGE 4
I2C Port Expander with 4 Push-Pull Outputs and 4 Inputs MAX7322 Typical Operating Characteristics (TA = +25°C, unless otherwise noted.) V+ = +5.0V 1.0 V+ = +3.3V V+ = +2.5V 0.8 0.6 0.4 0 V+ = +1.71V V+ = +2.5V 0 V+ = +1.71V -40 -25 -10 5 20 35 50 65 80 95 110 125 OUTPUT VOLTAGE HIGH vs. TEMPERATURE MAX7322 toc03 OUTPUT VOLTAGE LOW vs. TEMPERATURE 0.25 V+ = +3.3V ISINK = 15mA V+ = +5.0V ISINK = 20mA 0.10 0.05 0 20 TEMPERATURE (°C) 0.30 0.15 V+ = +3.3V 30 TEMPERATURE (°C) 0.35 0.
PAGE 5
I2C Port Expander with 4 Push-Pull Outputs and 4 Inputs MAX7322 Detailed Description Functional Overview MAX7319–MAX7329 Family Comparison The MAX7319–MAX7323 family consists of five pincompatible, 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 pincompatible, 16-port expanders that integrate the func-tions of the MAX7320 and one of either MAX7319, MAX7321, MAX7322, or MAX7323.
PAGE 6
I2C Port Expander with 4 Push-Pull Outputs and 4 Inputs MAX7322 Table 1. MAX7319–MAX7329 Family Comparison (continued) PART I2C INPUT OPENSLAVE INPUTS INTERRUPT DRAIN ADDRESS MASK OUTPUTS PUSHPULL OUTPUTS I2C DATA WRITE I2C DATA READ APPLICATION I/O versions: 8 open-drain I/O ports with latching transition detection interrupt and selectable pullups.
PAGE 7
I2C Port Expander with 4 Push-Pull Outputs and 4 Inputs MAX7322 Table 1. MAX7319–MAX7329 Family Comparison (continued) PART I2C INPUT OPENSLAVE INPUTS INTERRUPT DRAIN ADDRESS MASK OUTPUTS PUSHPULL OUTPUTS I2C DATA WRITE I2C DATA READ APPLICATION 16-PORT EXPANDERS MAX7324 MAX7325 MAX7326 101xxxx And 110xxxx MAX7327 8 Yes — 8 — — Software equivalent to a MAX7320 plus a MAX7319. Up to 8 — Up to 8 8 — — Software equivalent to a MAX7320 plus a MAX7321.
PAGE 8
I2C Port Expander with 4 Push-Pull Outputs and 4 Inputs MAX7322 On initial power-up, the MAX7322 cannot decode the address inputs AD2 and AD0 fully until the first I2C transmission. AD0 and AD2 initially appear to be connected to V+ or GND. This is important because the address selection determines the power-up logic state, and whether pullups are enabled.
PAGE 9
I2C Port Expander with 4 Push-Pull Outputs and 4 Inputs MAX7322 The snapshot is continuously compared with the actual input conditions, and if a change is detected for any port input, then an internal transition flag is set for that port, and INT is asserted to signal a state change. The four port inputs are sampled (internally latched into the snapshot register) and the old transition flags cleared during the I2C acknowledge of every MAX7322 read and write access.
PAGE 10
I2C Port Expander with 4 Push-Pull Outputs and 4 Inputs MAX7322 on the 2-wire interface, or if the master in a single-master system has an open-drain SCL output. Each transmission consists of a START condition sent by a master, followed by the MAX7322’s 7-bit slave address plus R/W bit, one or more data bytes, and finally a STOP condition (Figure 2). Start and Stop Conditions Both SCL and SDA remain high when the interface is not busy.
PAGE 11
I2C Port Expander with 4 Push-Pull Outputs and 4 Inputs MAX7322 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. Slave Address The MAX7322 has a 7-bit-long slave address (Figure 5).
PAGE 12
I2C Port Expander with 4 Push-Pull Outputs and 4 Inputs MAX7322 Reading from the MAX7322 the MAX7322 transmits the current port data, clears the change flags, and restarts the transition detection. INT deasserts during the slave address acknowledge. The new snapshot data is the current input port data transmitted to the master, so any input port changes that occur during the transmission are detected. INT remains high until the STOP condition.
PAGE 13
I2C Port Expander with 4 Push-Pull Outputs and 4 Inputs MAX7322 data is the current port data transmitted to the master, so any input port changes occurring during the transmission are detected. INT remains high until the STOP condition. Applications Information Writing to the MAX7322 The MAX7322’s SDA, SCL, AD0, AD2, input RST, INT, and input ports I2–I5 are overvoltage protected to +6V independent of V+. This allows the MAX7322 to operate from a lower supply voltage, such as +3.
PAGE 14
MAX7322 Port Structures Each of the four output ports O0, O1, O6, and O7 has protection diodes to V+ and to GND (Figure 9). When a port output is driven to a voltage lower than GND, the appropriate protection diode clamps the output to a diode drop above V+ or below GND. When the MAX7322 is powered down (V+ = 0), each output port appears as a diode clamp to GND (Figure 9). Each of the four input ports I2–I5 has a protection diode to GND (Figure 10).
PAGE 15
I2C Port Expander with 4 Push-Pull Outputs and 4 Inputs MAX7322 Functional Diagram Typical Application Circuit 3.3V AD0 AD2 SCL SDA RST INPUT I/O PORTS I2 C CONTROL FILTER O0 O1 I2 I3 I4 I5 O6 O7 0.
PAGE 16
I2C Port Expander with 4 Push-Pull Outputs and 4 Inputs MAX7322 Revision History REVISION NUMBER REVISION DATE PAGES CHANGED 1 7/07 — 2 5/14 No /V OPNs; removed automotive reference from Applications section; updated Packaging Information DESCRIPTION 1–17 1 For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642, or visit Maxim Integrated’s website at www.maximintegrated.com.