Datasheet

ManualsBrandsMAXIM INTEGRATED ManualsInterface ICsInterface IC - I/O extensions SPI 26 MHz TQFN 40 EP

Pin Configurations appear at end of data sheet.

General Description

The MAX7301 compact, serial-interfaced I/O expander

(or general-purpose I/O (GPIO) peripheral) provides

microprocessors with up to 28 ports. Each port is individu-

ally user configurable to either a logic input or logic output.

Each port can be configured either as a push-pull logic

output capable of sinking 10mA and sourcing 4.5mA, or

a Schmitt logic input with optional internal pullup. Seven

ports feature configurable transition detection logic, which

generates an interrupt upon change of port logic level.

The MAX7301 is controlled through an SPI-compatible

4-wire serial interface.

The MAX7301AAX and MAX7301ATL have 28 ports and

are available in 36-pin SSOP and 40-pin TQFN packages,

respectively. The MAX7301AAI has 20 ports and is avail-

able in a 28-pin SSOP package.

For a 2-wire I

C-interfaced version, refer to the MAX7300

data sheet.

For a pin-compatible port expander with additional

24mA constant-current LED drive capability, refer to the

MAX6957 data sheet.

Applications

● White Goods

● Gaming Machines

● Industrial Controllers

● System Monitoring

Features

● High-Speed 26MHz SPI-/QSPI™-/MICROWIRE

Compatible Serial Interface

● 2.5V to 5.5V Operation

● -40°C to +125°C Temperature Range

● 20 or 28 I/O Ports, Each Configurable as

Push-Pull Logic Output

Schmitt Logic Input

Schmitt Logic Input with Internal Pullup

● 11µA (max) Shutdown Current

● Logic Transition Detection for Seven I/O Ports

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

*EP = Exposed pad.

QSPI is a trademark of Motorola, Inc.

MICROWIRE is a registered trademark of National

Semiconductor Corp.

PART TEMP RANGE

PIN-

PACKAGE

MAX7301AAI+ -40°C to +125°C 28 SSOP

MAX7301AAX+ -40°C to +125°C 36 SSOP

MAX7301ATL+ -40°C to +125°C 40 TQFN-EP*

P10

P12

P13

P11

P15

P14

P17

P18

P16

P20

P19

P22

P23

P21

V+

GND

SCLK

DIN

DOUT

P30

P29

P31

P27

P28

P25

P24

P26

MAX7301

SSOP

CHIP SELECT

DATA IN

CLOCK IN

DATA OUT

I/O 4

I/O 5

I/O 6

I/O 7

I/O 8

I/O 9

I/O 10

I/O 11

I/O 12

I/O 13

I/O 14

I/O 15

I/O 16

I/O 17

I/O 18

I/O 19

I/O 20

I/O 21

I/O 22

I/O 23

I/O 24

I/O 25

I/O 26

I/O 27

I/O 28

I/O 29

I/O 30

I/O 31

47nF

ISET

39kΩ

MAX7301 4-Wire-Interfaced, 2.5V to 5.5V,

20-Port and 28-Port I/O Expander

19-2438; Rev 7; 7/14

Typical Operating Circuit

Ordering Information

Summary of content (17 pages)

PAGE 1
MAX7301 General Description The MAX7301 compact, serial-interfaced I/O expander (or general-purpose I/O (GPIO) peripheral) provides microprocessors with up to 28 ports. Each port is individually user configurable to either a logic input or logic output. Each port can be configured either as a push-pull logic output capable of sinking 10mA and sourcing 4.5mA, or a Schmitt logic input with optional internal pullup.
PAGE 2
MAX7301 4-Wire-Interfaced, 2.5V to 5.5V, 20-Port and 28-Port I/O Expander Absolute Maximum Ratings (Voltage with respect to GND.) V+.............................................................................-0.3V to +6V All Other Pins...............................................-0.3V to (V+ + 0.3V) P4–P31 Current ...............................................................±30mA GND Current.....................................................................
PAGE 3
MAX7301 4-Wire-Interfaced, 2.5V to 5.5V, 20-Port and 28-Port I/O Expander Electrical Characteristics (continued) (Typical Operating Circuit, V+ = 2.5V to 5.5V, TA = TMIN to TMAX, unless otherwise noted.) (Note 1) PARAMETER Port Sink Current Output Short-Circuit Current SYMBOL IOL IOLSC Input High-Voltage SCLK, DIN, CS VIH Input Low-Voltage SCLK, DIN, CS VIL Input Leakage Current SCLK, DIN, CS IIH, IIL CONDITIONS MIN TYP MAX UNITS 2 10 18 mA Port configured output low, shorted to V+ 2.
PAGE 4
MAX7301 4-Wire-Interfaced, 2.5V to 5.5V, 20-Port and 28-Port I/O Expander Typical Operating Characteristics (TA = +25°C, unless otherwise noted.) ALL PORTS OUTPUT (0) 0.20 0.16 0.12 0.08 -40.0 -12.5 15.0 42.5 70.0 6 5 V+ = 2.5V V+ = 3.3V 4 97.5 3 125.0 -12.5 -40.0 15.0 42.5 70.0 GPO SINK CURRENT vs. TEMPERATURE (OUTPUT = 0) V+ = 2.5V TO 5.5V, VPORT = 0.6V 14 12 10 8 6 -40.0 0.1 125.0 2.0 2.5 3.0 3.5 15.0 42.5 70.0 97.5 VPORT = 1.4 8 V+ = 5.5V 7 3 -40.0 -12.5 15.0 42.
PAGE 5
MAX7301 4-Wire-Interfaced, 2.5V to 5.5V, 20-Port and 28-Port I/O Expander Pin Description PIN NAME FUNCTION 36 SSOP 28 SSOP TQFN 1 1 36 ISET Bias Current Setting. Connect ISET to GND through a resistor (RISET) value of 39kW to 120kW. 2, 3 2, 3 37, 38, 39 GND Ground 4 4 40 DOUT — 5–24 — P12–P31 5–32 — 1–10, 12–19, 21–30 P4–P31 4-Wire Interface Serial Data Output Port I/O Ports.
PAGE 6
MAX7301 4-Wire-Interfaced, 2.5V to 5.5V, 20-Port and 28-Port I/O Expander Table 1.
PAGE 7
MAX7301 4-Wire-Interfaced, 2.5V to 5.5V, 20-Port and 28-Port I/O Expander CONFIGURATION PORT REGISTERS MASK REGISTER CONFIGURATION REGISTERS PORT CHANGE DETECTOR GPIO P4 TO P31 DATA CE R/W 8 R/W GPIO DATA 8 COMMAND REGISTER DECODE 8 8 DATA BYTE COMMAND BYTE CS D0 D1 D2 D3 D4 D5 D6 D7 D8 D9 D10 D11 D12 D13 D14 D15 DIN D0 D1 D2 D3 D4 D5 D6 D7 D8 D9 D10 D11 D12 D13 D14 D15 DOUT SCLK Figure 1.
PAGE 8
MAX7301 4-Wire-Interfaced, 2.5V to 5.5V, 20-Port and 28-Port I/O Expander CS tCSH tCSS tCL tCH tCSH SCLK tDS tDH DIN tDO DOUT Figure 2. 4-Wire Interface Initial Power-Up On initial power-up, all control registers are reset, and the MAX7301 enters shutdown mode (Table 4). Transition (Port Data Change) Detection Port transition detection allows any combination of the seven ports P24–P30 to be continuously monitored for changes in their logic status (Figure 5).
PAGE 9
MAX7301 4-Wire-Interfaced, 2.5V to 5.5V, 20-Port and 28-Port I/O Expander MICROCONTROLLER SERIAL-DATA INPUT SERIAL CS OUTPUT CS SERIA-CLOCK OUTPUT SCLK SERIAL-DATA OUTPUT DIN CS CS MAX7301 SCLK DOUT MAX7301 SCLK DIN DOUT DIN MAX7301 DOUT Figure 3. Daisy-Chain Arrangement for Controlling Multiple MAX7301s CS SCLK DIN D15 =0 D14 D13 D12 D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 DOUT D0 D15 = 0 . Figure 4.
PAGE 10
MAX7301 4-Wire-Interfaced, 2.5V to 5.5V, 20-Port and 28-Port I/O Expander Table 3. Register Address Map COMMAND ADDRESS D15 D14 D13 D12 D11 D10 D9 D8 HEX CODE No-Op R/W 0 0 0 0 0 0 0 0x00 Configuration R/W 0 0 0 0 1 0 0 0x04 Transition Detect Mask R/W 0 0 0 0 1 1 0 0x06 Factory Reserved. Do not write to this.
PAGE 11
MAX7301 4-Wire-Interfaced, 2.5V to 5.5V, 20-Port and 28-Port I/O Expander Table 3. Register Address Map (continued) COMMAND ADDRESS D15 D14 D13 D12 D11 D10 D9 D8 HEX CODE Port 26 only (data bit D0. D7–D1 read as 0) R/W 0 1 1 1 0 1 0 0x3A Port 27 only (data bit D0. D7–D1 read as 0) R/W 0 1 1 1 0 1 1 0x3B Port 28 only (data bit D0. D7–D1 read as 0) R/W 0 1 1 1 1 0 0 0x3C Port 29 only (data bit D0.
PAGE 12
MAX7301 4-Wire-Interfaced, 2.5V to 5.
PAGE 13
MAX7301 4-Wire-Interfaced, 2.5V to 5.5V, 20-Port and 28-Port I/O Expander Table 4.
PAGE 14
MAX7301 4-Wire-Interfaced, 2.5V to 5.5V, 20-Port and 28-Port I/O Expander Table 7. Transition Detection Control (M Data Bit D7) Format REGISTER DATA FUNCTION ADDRESS CODE (HEX) D7 D6 D5 D4 D3 D2 D1 D0 Disabled 0x04 0 0 X X X X X S Enabled 0x04 1 0 X X X X X S Table 8. Transition Detection Mask Register FUNCTION REGISTER ADDRESS (HEX) Mask Register 0x06 www.maximintegrated.
PAGE 15
MAX7301 4-Wire-Interfaced, 2.5V to 5.5V, 20-Port and 28-Port I/O Expander Pin Configurations GND 2 35 CS GND 3 34 DIN DOUT 4 33 SCLK 24 P31 P8 5 32 P4 23 P30 P12 6 31 P31 22 P29 P9 7 30 P5 P13 8 25 SCLK P12 5 P14 7 27 CS 26 DIN GND 3 DOUT 4 P13 6 ISET 1 MAX7301 MAX7301 20 32 19 DIN CS V+ ISET 33 18 34 17 37 14 38 13 29 P30 GND GND GND N.C. P25 P24 P23 P22 P21 P20 P19 39 12 P18 28 P6 DOUT 40 11 N.C.
PAGE 16
MAX7301 4-Wire-Interfaced, 2.5V to 5.5V, 20-Port and 28-Port I/O Expander Package Information For the latest package outline information and land patterns (footprints), go to www.maximintegrated.com/packages. Note that a “+”, “#”, or “-” in the package code indicates RoHS status only. Package drawings may show a different suffix character, but the drawing pertains to the package regardless of RoHS status. PACKAGE TYPE 28 SSOP 36 SSOP 40 TQFN-EP www.maximintegrated.com PACKAGE CODE DOCUMENT NO.
PAGE 17
MAX7301 4-Wire-Interfaced, 2.5V to 5.5V, 20-Port and 28-Port I/O Expander Revision History REVISION NUMBER REVISION DATE PAGES CHANGED 0 4/02 Initial Release 1 10/02 Updated General Description, Detailed Description, Initial Power-Up section, Table 3 and Table 8 2 2/03 Corrected input leakage current 3 11/03 Updated Table 2, Table 3, Figure 5, Serial Interface, Reading Device Registers, Transition (Port Data Change) Detection sections.