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General Description

The MAX7306/MAX7307 I

C-/SMBus

™

-compatible, seri-

al-interfaced peripherals feature four level-translating

I/Os and operate from a 1.62V to 3.6V power supply.

The MAX7307 features a port supply (V

) that allows

level translation on I/O ports to operate from a separate

power supply from 1.4V to 5.5V. The MAX7306 features

an address select input (AD0) to allow up to four unique

slave addresses.

The MAX7306/MAX7307 ports P2, P3, and P4 can be

configured as inputs, push-pull outputs, and open-drain

outputs. Port P1 can be configured as a general-pur-

pose input, open-drain output, or an open-drain INT out-

put. Ports P2 and P3 can be configured as OSCIN and

OSCOUT, respectively. The MAX7306/MAX7307 include

an internal oscillator for PWM, blink, and key debounce,

or to cascade multiple MAX7306/MAX7307s. The exter-

nal clock can be used to set a specific PWM and blink

timing. The RST input asynchronously clears the 2-wire

interface and terminates a bus lockup involving the

MAX7306/MAX7307.

All ports configured as output feature 33-step PWM,

allowing any output to be set from fully off, 1/32 to 31/32

duty cycle, to fully on. All output ports also feature LED

blink control, allowing blink periods of 1/8 second, 1/4

second, 1/2 second, 1, 2, 4, or 8 seconds. Any port can

blink during this period with a 1/16 to 15/16 duty cycle.

The MAX7306/MAX7307 are specified over the -40°C to

+125°C temperature range and are available in 10-pin

µDFN (2mm x 2mm) and 10-pin µMAX

packages.

Applications

Cell Phones LCD/Keypad Backlights

System I/O Ports LED Status Indicators

Features

♦ 1.4V to 5.5V I/O Level Translation Port Supply (V

)

♦ 1.62V to 3.6V Power Supply

♦ Four Individually Configurable GPIO Ports

P1 = Open-Drain I/O

P2, P3, P4 = Push-Pull or Open-Drain I/O

♦ Individual 33-Step PWM Intensity Control

♦ Blink Controls with 15 Steps on Outputs

♦ 1kHz PWM Period Provides Flicker-Free LED

Intensity Control

♦ 25mA (max) Port Output Sink Current (100mA

max Ground Current)

♦ Inputs Overvoltage Protected Up to 5.5V (V

)

♦ Transition Detection with Optional Interrupt Output

♦ Optional Input Debouncing

♦ RST Input Clears Serial Interface, Can Restore

Power-Up Default State, and Synchronizes Blink

Timing

♦ Oscillator Input and Output Enables Cascading

Multiple Devices

♦ Low 0.75µA (typ) Standby Current

MAX7306/MAX7307

SMBus/I

C Interfaced 4-Port, Level-Translating

GPIOs and LED Drivers

________________________________________________________________ Maxim Integrated Products 1

Ordering Information

19-0836; Rev 1; 8/10

For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,

or visit Maxim’s website at www.maxim-ic.com.

Ordering Information continued at end of data sheet.

Pin Configurations appear at end of data sheet.

EVALUATION KIT

AVAILABLE

SMBus is a trademark of Intel Corp.

µMAX is a registered trademark of Maxim Integrated Products, Inc.

PART

TOP MARK

PIN-PACKAGE

MAX7306ALB+ AAL

10 µDFN (2mm x 2mm)

Note: All devices are specified over the -40°C to +125°C oper-

ating temperature range.

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

μC

SDA

GND

+1.8V

P2/OSCIN

P3/OSCOUT

+4.5V

MAX7307

SCL

RST

INT

SDA

SCL

RST

P1/INT

AD0

μC

SDA

GND

+2.5V

P2/OSCIN

P3/OSCOUT

MAX7306

SCL

RST

INT

SDA

SCL

RST

P1/INT

Typical Operating Circuit

Summary of content (23 pages)

PAGE 1
KIT ATION EVALU E L B AVAILA 19-0836; Rev 1; 8/10 SMBus/I2C Interfaced 4-Port, Level-Translating GPIOs and LED Drivers I2C-/SMBus™-compatible, The MAX7306/MAX7307 serial-interfaced peripherals feature four level-translating I/Os and operate from a 1.62V to 3.6V power supply. The MAX7307 features a port supply (VLA) that allows level translation on I/O ports to operate from a separate power supply from 1.4V to 5.5V.
PAGE 2
MAX7306/MAX7307 SMBus/I2C Interfaced 4-Port, Level-Translating GPIOs and LED Drivers ABSOLUTE MAXIMUM RATINGS (All voltages referenced to GND.) VDD ..........................................................................-0.3V to +4V VLA, SCL, SDA, AD0, and RST.................................-0.3V to +6V P1/INT, P2/OSCIN, P3/OSCOUT, and P4 MAX7306 ................................................-0.3V to (VDD + 0.3V) MAX7307.................................................-0.3V to (VLA + 0.
PAGE 3
SMBus/I2C Interfaced 4-Port, Level-Translating GPIOs and LED Drivers (VDD = 1.62V to 3.6V, TA = TMIN to TMAX, unless otherwise noted. Typical values are at VDD = 3.3V, VLA = 3.3V, TA = +25°C.) (Note 1) PARAMETER Operating Supply Voltage Port Logic Supply Voltage Power-On Reset Voltage Power-On Reset Hysteresis SYMBOL CONDITIONS VDD VLA VPOR MIN TYP 1.62 1.40 VDD rising VPORHYST MAX UNITS 3.60 V 5.50 V 1.0 1.3 1.
PAGE 4
MAX7306/MAX7307 SMBus/I2C Interfaced 4-Port, Level-Translating GPIOs and LED Drivers PORT, INTERRUPT (INT), AND RESET (RST) TIMING CHARACTERISTICS (VDD = 1.62V to 3.6V, TA = TMIN to TMAX, unless otherwise noted. Typical values are at VDD = 3.3V, VLA = 3.3V (MAX7307 only), TA = +25°C.
PAGE 5
SMBus/I2C Interfaced 4-Port, Level-Translating GPIOs and LED Drivers 0.55 0.50 0.45 INTERNAL OSCILLATOR ON 0.40 13.0 12.5 12.0 11.5 fSCL = 400kHz 11.0 35.5 35.0 34.5 34.0 33.5 33.0 -40 -25 -10 5 20 35 50 65 80 95 110 125 TEMPERATURE (°C) -40 -25 -10 5 20 35 50 65 80 95 110 125 TEMPERATURE (°C) -40 -25 -10 5 20 35 50 65 80 95 110 125 TEMPERATURE (°C) PORT OPEN-DRAIN OUTPUT LOW VOLTAGE vs. SINK CURRENT PUSH-PULL OUTPUT HIGH VOLTAGE vs. SOURCE CURRENT INTERNAL OSCILLATOR vs. TEMPERATURE 0.
PAGE 6
SMBus/I2C Interfaced 4-Port, Level-Translating GPIOs and LED Drivers MAX7306/MAX7307 Pin Description PIN 6 NAME FUNCTION 1 RST Reset Input. RST is an active-low input, referenced to VDD, that clears the 2-wire interface, which can be configured to put the device in the power-up reset condition and reset the PWM and blink timing. 2 2 P1/INT Input/Output Port. P1/INT is configurable as an open-drain I/O or as a transition detection interrupt output. 3 3 GND 4 4 P2/OSCIN Input/Output Port.
PAGE 7
SMBus/I2C Interfaced 4-Port, Level-Translating GPIOs and LED Drivers MAX7307 ONLY VDD VLA OUTPUT LOGIC I/O I/O CONTROL INPUT LOGIC MAX7306/ MAX7307 SCL SDA P1–P4 I 2C AD0 MAX7306 ONLY RST REGISTER BANK Detailed Description The MAX7306/MAX7307 4-port, general-purpose port expanders operate from a 1.62V to 3.6V power supply. Ports P2 through P4 can be configured as inputs, pushpull outputs, and open-drain outputs.
PAGE 8
MAX7306/MAX7307 SMBus/I2C Interfaced 4-Port, Level-Translating GPIOs and LED Drivers Table 1.
PAGE 9
SMBus/I2C Interfaced 4-Port, Level-Translating GPIOs and LED Drivers MAX7306/MAX7307 Table 3. Configuration Register (0x26) REGISTER BIT DESCRIPTION VALUE D7 Interrupt Status Flag (Read-Only) 0 An interrupt has occurred on at least one interrupt enabled input port. 1* No interrupt has occurred on an interrupt enabled input port. D6 Transition Flag (Read-Only) 0 Transition has occurred on an input port. 1* No transition has occurred on an input port. 0 Reserved.
PAGE 10
MAX7306/MAX7307 SMBus/I2C Interfaced 4-Port, Level-Translating GPIOs and LED Drivers Slave Address I/O Port Registers The MAX7307 is set to slave address 0x98 and the MAX7306 can be set to one of four I2C slave addresses 0x98 to 0x9F, using the address input AD0 (see Table 5) and is accessed over an I2C or SMBus serial interface. The MAX7306 slave address is determined on each I2C transmission, regardless of the transmission actually addressing the device or not.
PAGE 11
SMBus/I2C Interfaced 4-Port, Level-Translating GPIOs and LED Drivers PORT_[2] (DEBOUNCE) 1 VLA MAX7306/MAX7307 VDD MAX7307 ONLY 0 PORT_[6] (THRESHOLD SELECT) PORT_[0] (PORTIN) 0 I/O 1 DEBOUNCE LOGIC TRANSITION DETECTION TRANSITION DETECTION INTERRUPT LOGIC PORT_ [5] INTERRUPT ENABLE INT INT2 INT INT4 Figure 1. Input Port Structure Table 7.
PAGE 12
MAX7306/MAX7307 SMBus/I2C Interfaced 4-Port, Level-Translating GPIOs and LED Drivers PORT_[5] 5-BIT PWM 0 PORT_[4:0] CLOCK 3-BIT PRESCALER 4-BIT BLINK CONFIG26 [4:2] PORT_[3:0] I/O 1 Figure 2. Output Port Structure VLA MAX7307 ONLY VDD VDD SELECT VLA MAX7307 ONLY SELECT INPUT PORT P1 OUTPUT PORTS P2 THROUGH P4 INPUT OUTPUT P1 P2, P3, P4 Figure 3.
PAGE 13
SMBus/I2C Interfaced 4-Port, Level-Translating GPIOs and LED Drivers When the port input is read through the serial interface, the MAX7306/MAX7307 do not return the instantaneous backing value of the logic level from the port because debounce is active. Instead, the MAX7306/MAX7307 return the stored debounced input signal. When debouncing is enabled for a port input, transition detection applies to the stored debounced input signal value, rather than to the instantaneous value at the input.
PAGE 14
MAX7306/MAX7307 SMBus/I2C Interfaced 4-Port, Level-Translating GPIOs and LED Drivers the host processor of data changes at the selected inputs. Reset INT by reading any port’s I/O registers (0x01 to 0x04). Standby Mode Upon power-up, the MAX7306/MAX7307 enter standby mode when the serial interface is idle. If any of the PWM intensity control, blink, or debounce features are used, the operating current rises because the internal PWM oscillator is running and toggling counters.
PAGE 15
SMBus/I2C Interfaced 4-Port, Level-Translating GPIOs and LED Drivers 0MHz TO 1MHz EXTERNAL OSCILLATOR 0MHz TO 1MHz MAX7306 P2/OSCIN P2/OSCIN MAX7306 P2/OSCIN P3/OSCOUT P2/OSCIN MAX7306 MAX7306 P3/OSCOUT MAX7306 P2/OSCIN MAX7306 P2/OSCIN Figure 5. Synchronizing Multiple MAX7306s (External Clock) PWM and Blink Timing The MAX7306/MAX7307 divide the 32kHz nominal internal oscillator OSC or external clock source OSCIN frequency by 32 to provide a nominal 1kHz PWM frequency.
PAGE 16
MAX7306/MAX7307 SMBus/I2C Interfaced 4-Port, Level-Translating GPIOs and LED Drivers PORT REGISTER VALUE 0b0X000000 0b0X000001 0b0X000010 977μs NOMINAL PWM PERIOD (1024Hz PERIOD) 0b0X011101 OUTPUT LOW 29/32 DUTY PWM 0b0111XXXX LOW HIGH IMPEDANCE OUTPUT LOW 2/32 DUTY PWM OUTPUT LOW 3/32 DUTY PWM 0b0X011111 LOW HIGH IMPEDANCE OUTPUT LOW 1/32 DUTY PWM 0b0X000011 0b0X011110 HIGH IMPEDANCE OUTPUT STATIC LOW (STATIC LOGIC-LOW OUTPUT OR LED DRIVE ON) LOW HIGH IMPEDANCE LOW HIGH IMPEDANCE LOW HIG
PAGE 17
SMBus/I2C Interfaced 4-Port, Level-Translating GPIOs and LED Drivers REGISTER DATA PWM SETTING D7 D6 D5 D4 D3 D2 D1 Port P_ is a static logic-level low output port 0 X 0 0 0 0 0 D0 0 Port P_ is a PWM output port; PWM duty cycle is 1/32 0 X 0 0 0 0 0 1 Port P_ is a PWM output port; PWM duty cycle is 3/32 0 X 0 0 0 0 1 1 Port P_ is a PWM output port; PWM duty cycle is 7/32 0 X 0 0 0 1 1 1 Port P_ is a PWM output port; PWM duty cycle is 15/32 0 X 0 0 1 1 1 1
PAGE 18
MAX7306/MAX7307 SMBus/I2C Interfaced 4-Port, Level-Translating GPIOs and LED Drivers START and STOP Conditions Both SCL and SDA remain high when the interface is not busy. A master signals the beginning of a transmission with a START (S) condition by transitioning SDA from high to low while SCL is high. When the master has finished communicating with the slave, it issues a STOP (P) condition by transitioning SDA from low to high while SCL is high.
PAGE 19
SMBus/I2C Interfaced 4-Port, Level-Translating GPIOs and LED Drivers Slave Address The MAX7306/MAX7307 have a 7-bit long slave address (Figure 12). The 8th bit following the 7-bit slave address is the R/W bit. Set the R/W bit low for a write command and high for a read command. The first 5 bits of the MAX7306 slave address (A6–A2) are always 1, 0, 0, 1, and 1. Slave address bits A1 and A0 are selected by the address input AD0. AD0 can be connected to GND, VDD, SDA, or SCL.
PAGE 20
MAX7306/MAX7307 SMBus/I2C Interfaced 4-Port, Level-Translating GPIOs and LED Drivers WRITE TO OUTPUT PORTS REGISTERS (P4) SCL 1 2 1 0 3 4 5 6 7 8 9 A1 A0 0 A SLAVE ADDRESS SDA S 0 1 REGISTER ADDRESS 1 START CONDITION R/W 0 0 0 0 0 1 0 0 A ACKNOWLEDGE FROM SLAVE MSB DATA LSB AA P STOP ACKNOWLEDGE FROM SLAVE ACKNOWLEDGE DATA VALID P4–P1 tPPV Figure 14.
PAGE 21
SMBus/I2C Interfaced 4-Port, Level-Translating GPIOs and LED Drivers Applications Information Hot Insertion Serial interfaces SDA, SCL (and AD0 for the MAX7306) remain high impedance with up to 5.5V asserted on them when the MAX7306/MAX7307 are powered down (VDD = 0V), independent of the voltages on the port supply VLA. When VDD = 0V, or if VDD falls below the MAX7306/MAX7307’s reset threshold, all I/O ports become high impedance.
PAGE 22
SMBus/I2C Interfaced 4-Port, Level-Translating GPIOs and LED Drivers SDA VDD VLA/AD0* P4 TOP VIEW SCL MAX7306/MAX7307 Pin Configurations 10 9 8 7 6 RST 1 MAX7306/ MAX7307 + P1/INT 2 GND 3 P2/OSCIN 4 P3/OSCOUT 5 10 SCL MAX7306/ MAX7307 EP 5 MAX7306AUB+ AAAO MAX7307ALB+ AAK MAX7307AUB+ AAAN ( ) PIN-PACKAGE VDD 7 VLA (AD0)* 6 P4 Chip Information PROCESS: BiCMOS 10 µMAX-EP* 10 µDFN (2mm x 2mm) 10 µMAX-EP* Note: All devices are specified over the -40°C to +125°C operati
PAGE 23
SMBus/I2C Interfaced 4-Port, Level-Translating GPIOs and LED Drivers PAGES CHANGED REVISION NUMBER REVISION DATE 0 6/07 Initial release — 1 8/10 Updated Driving LED Load section 21 DESCRIPTION Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied. Maxim reserves the right to change the circuitry and specifications without notice at any time.