MAXIM MAX7304 User Manual

19-5949; Rev 1; 3/12

MAX7304

I2C-Interfaced 16-Port,

Level-Translating GPIO and LED Driver

with High Level of Integrated ESD Protection

General Description

The MAX7304 consists of 16 port GPIOs, with 12 pushpull GPIOs and four open-drain GPIOs configurable as PWM-controlled LED drivers. The device supports a

1.62V to 3.6V separate power supply for level translation. An address-select input (AD0) allows up to four unique slave addresses for the device.

Each GPIO can be programmed to one of the two externally applied logic voltage levels. PORT15–PORT12 can also be configured as LED drivers that feature constant-current sinks and PWM intensity control with the internal oscillator. The maximum constant-current level for each open-drain LED port is 20mA. The intensity of the LED on each open-drain port can be individually adjusted through a 256-step PWM control. The port also features LED fading.

The same index rows and columns in the device can be used as a direct logic-level translator.

The device is offered in a 24-pin (3.5mm x 3.5mm) TQFN package with an exposed pad, and a small 25-bump (2.159mm x 2.159mm) wafer-level package (WLP) for cell phones, pocket PCs, and other portable consumer electronic applications.

The device operates over the -40NC to +85NC extended temperature range.

Applications

Cell Phones

Notebooks

PDAs

Handheld Games

Portable Consumer Electronics

Features

S Four LED Driver Pins on PORT15–PORT12

S Integrated High-ESD Protection

±8kV IEC 61000-4-2 Contact Discharge

±15kV IEC 61000-4-2 Air-Gap Discharge

S 5V Tolerant, Open-Drain I/O Ports Capable of

Constant-Current LED Drive

S 256-Step PWM Individual LED Intensity-Control

Accuracy

S Individual LED Blink Rates and Common LED

Fade-In /Out Rates from 256ms to 4096ms

S User-Configurable Debounce Time (1ms to 32ms) S Configurable Edge-Triggered Port Interrupt (INT)

S 1.62V to 3.6V Operating Supply Voltage

S Individually Programmable GPIOs to Two Logic

Levels

S 8-Channel Individual Programmable Level

Translators

S Supports Hot Insertion

S 400kbps, 5.5V Tolerant I2C Serial Interface with

Selectable Bus Timeout

Ordering Information appears at end of data sheet.

For related parts and recommended products to use with this part, refer to www.maxim-ic.com/MAX7304.related.

Typical Operating Circuit

+1.8V

+2.6V

PORT0

PORT1

MAX7304

INT

MCU

_________________________________________________________________ Maxim Integrated Products 1

SDA

SCL

AD0

GND

PORT13

PORT14

PORT15

GPIO

+5V

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.

MAX7304

I2C-Interfaced 16-Port,

Level-Translating GPIO and LED Driver

with High Level of Integrated ESD Protection

ABSOLUTE MAXIMUM RATINGS

CC, VLA

PORT11–PORT0 to GND .......................... -0.3V to (VCC + 0.3V)

PORT15–PORT12 to GND ....................................... -0.3V to +6V

SDA, SCL, AD0, INT to GND ..................................-0.3V to +6V

VLA to VCC ...........................................................-0.3V to +2.3V

DC Current on PORT15–PORT12 to GND .........................25mA

DC Current on PORT11–PORT0 to GND .............................7mA

VCC, VLA, GND Current .....................................................80mA

DC Current VCC, VLA to PORT11–PORT0 ...........................5mA

Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability.

PACKAGE THERMAL CHARACTERISTICS (Note 1)

TQFN

Note 1: Package thermal resistances were obtained using the method described in JEDEC specification JESD51-7, using a four-

to GND ....................................................-0.3V to +4V

Junction-to-Ambient Thermal Resistance (BJA) ....65.1NC/W

Junction-to-Case Thermal Resistance (BJC) ...........5.4NC/W

layer board. For detailed information on package thermal considerations, refer to www.maxim-ic.com/thermal-tutorial.

Continuous Power Dissipation (TA = +70NC)

TQFN (derate 15.4mW/NC above +70NC)..................1229mW

WLP (derate 19.2mW/NC above +70NC)......................850mW

Operating Temperature Range .......................... -40NC to +85NC

Junction Temperature .....................................................+150NC

Storage Temperature Range ............................ -65NC to +150NC

Lead Temperature (TQFN) (soldering, 10s) ....................+300NC

Soldering Temperature (reflow) ......................................+260NC

WLP

Junction-to-Ambient Thermal Resistance (BJA) .......52NC/W

ELECTRICAL CHARACTERISTICS

(VCC = 1.62V to 3.6V, TA = -40NC to +85NC, unless otherwise noted. Typical values are at VCC = 3.3V, TA = +25NC.) (Notes 2, 3)

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

Operating Supply Voltage V

Second Logic Supply V

Operating Supply Current I

Sleep-Mode Supply Current I

POR Threshold V

GPIO SPECIFICATIONS

External Supply Voltage PORT15–PORT12 (LED Drivers)

LED Port-to-Port Sink Current Variation

10mA Port Sink Current PORT15–PORT12

20mA Port Sink Current PORT15–PORT12

Input High Voltage PORT_ V Input Low Voltage PORT_ V

Input Leakage Current PORT11–PORT0

Input Leakage Current PORT15–PORT12

LEAKAGE

POR

LED

Oscillator running 50 65

Not using GPO or LED configuration 1.8 3

VCC = 3.3V, VOL = 1V, TA = +25NC, 10mA output mode

VOL = 1V

VOL = 0.5V

VOL = 1V

VOL = 0.5V

VS = V CC or VLA depending on reference logic level setting

Input voltage = VCC or V

Input voltage = 5V -1 +1

TA = +25NC

VCC = 3.6V, TA = +25NC TA = +25NC

VCC = 3.6V, TA = +25NC

GND

1.62 3.3 3.6 V

8.6 11.4

18.13 21.52

0.7 O V

-2 +2

3.3 3.6 V

1.2 V

5 V

Q1.5 Q2.4

9.5

19.05

0.3 O V

mAVCC = 3.3V 9.04 10 10.96

mAVCC = 3.3V 18.47 20 21.34

V V

_________________________________________________________________ Maxim Integrated Products 2

MAX7304

I2C-Interfaced 16-Port,

Level-Translating GPIO and LED Driver

with High Level of Integrated ESD Protection

ELECTRICAL CHARACTERISTICS (continued)

(VCC = 1.62V to 3.6V, TA = -40NC to +85NC, unless otherwise noted. Typical values are at VCC = 3.3V, TA = +25NC.) (Notes 2, 3)

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

Input Capacitance PORT_ C

Output Low Voltage PORT_ V

Output High Voltage COL3–COL0, ROW_

Output Logic-Low Voltage (INT)

PWM Frequency f

SERIAL-INTERFACE SPECIFICATIONS

Input High Voltage SDA, SCL, AD0

Input Low Voltage SDA, SCL, AD0

Input Leakage Current SDA, SCL, AD0

Output Logic-Low Voltage SDA

Input Capacitance SDA, SCL, AD0

I2C TIMING SPECIFICATIONS

SCL Serial-Clock Frequency f

Bus Free Time Between a STOP and START Condition

Hold Time (Repeated) START Condition

Repeated START Condition Setup Time

STOP Condition Setup Time t

Data Hold Time t

Data Setup Time t

SCL Clock Low Period t

SCL Clock High Period t

Rise Time of Both SDA and SCL Signals, Receiving

Fall Time of Both SDA and SCL Signals, Receiving

Fall Time of SDA Signal, Transmitting

LEAKAGE

HD, STA

SU, STA

SU, STO

HD, DAT

SU, DAT

PWM

SCL

BUF

LOW

HIGH

F, TX

VCC = 1.62V and I VCC = 1.62V and I

VCC = 1.62V and I

= 6mA 0.6 V

SINK

Derived from oscillator clock 500 Hz

Input voltage = 5.5V or V

= 6mA 0.6 V

SINK

(Notes 4, 5) 10 pF

Bus timeout enabled 0.05 400 Bus timeout disabled 0 400

(Note 6) 0.9

(Notes 4, 5)

(Notes 4, 7)

= 2.5mA 50 100

SINK

= 5mA 80 250

SINK

SOURCE

= 2.5mA

= 5mA

GND

VCC -

120

VCC -

250

0.7 O V

-1 +1

1.3

0.6

100 ns

1.3

0.7

20 pF

VCC -

0.3 O V

20 +

0.1C

20 +

0.1C

20 +

0.1C

300 ns

250 ns

kHz

_________________________________________________________________ Maxim Integrated Products 3

MAX7304

I2C-Interfaced 16-Port,

Level-Translating GPIO and LED Driver

with High Level of Integrated ESD Protection

ELECTRICAL CHARACTERISTICS (continued)

(VCC = 1.62V to 3.6V, TA = -40NC to +85NC, unless otherwise noted. Typical values are at VCC = 3.3V, TA = +25NC.) (Notes 2, 3)

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

Pulse Width of Spike Suppressed t

Capacitive Load for Each Bus Line C

Bus Timeout t

TIMEOUT

ESD PROTECTION

PORT_

All Other Pins Human Body Model

Note 2: All parameters are tested at TA = +25NC. Specifications over temperature are guaranteed by design. Note 3: All digital inputs at VCC or GND. Note 4: Guaranteed by design. Note 5: CB = total capacitance of one bus line in pF. tR and tF measured between 0.8V and 2.1V. Note 6: A master device must provide a hold time of at least 300ns for the SDA signal (referred to VIL of the SCL signal) to bridge

the undefined region of SCL’s falling edge.

Note 7: I

= 6mA. CB = total capacitance of one bus line in pF. tR and tF measured between 0.8V and 2.1V.

SINK

Note 8: Input filters on the SDA, SCL, and AD0 inputs suppress noise spikes less than 50ns.

(Notes 4, 8) 50 ns

(Note 4) 400 pF

14 19 27 ms

IEC 61000-4-2 Air-Gap Discharge IEC 61000-4-2 Contact Discharge

Q15

Q2.5

(VCC = 2.5V, VLA = 2.5V, TA = +25NC, unless otherwise noted.)

GPO OUTPUT LOW VOLTAGE

vs. SINK CURRENT (PORT15–PORT12)

120

VCC = 2.4V

100

GPO OUTPUT LOW VOLTAGE (mV)

TA = +25°C

SINK CURRENT (mA)

TA = +85°C

TA = -40°C

120

100

MAX7304 toc01

GPO OUTPUT LOW VOLTAGE (mV)

18161412108642

GPO OUTPUT LOW VOLTAGE

vs. SINK CURRENT (PORT15–PORT12)

VCC = 3.0V

Typical Operating Characteristics

TA = +85°C

TA = +25°C

SINK CURRENT (mA)

TA = -40°C

GPO OUTPUT LOW VOLTAGE

vs. SINK CURRENT (PORT15–PORT12)

120

VCC = 3.6V

100

MAX7304 toc02

GPO OUTPUT LOW VOLTAGE (mV)

18161412108642

TA = +25°C

SINK CURRENT (mA)

TA = +85°C

TA = -40°C

MAX7304 toc03

18161412108642

_________________________________________________________________ Maxim Integrated Products 4

Level-Translating GPIO and LED Driver

with High Level of Integrated ESD Protection

Typical Operating Characteristics (continued)

(VCC = 2.5V, VLA = 2.5V, TA = +25NC, unless otherwise noted.)

SLEEP-MODE SUPPLY CURRENT

1.8

1.6

1.4

1.2

1.0

0.8

0.6

0.4

SLEEP-MODE SUPPLY CURRENT (µA)

0.2

1.6 3.6

vs. OUTPUT VOLTAGE (PORT15– PORT12)

vs. SUPPLY VOLTAGE

TA = +25°C

SUPPLY VOLTAGE (V)

CONSTANT-CURRENT GPIO

OUTPUT SINK CURRENT

VCC = 3.0V

TA = -40°C

TA = +25°C

TA = +85°C

MAX7304 toc04

TA = -40°C

3.43.22.8 3.02.0 2.2 2.4 2.61.8

MAX7304 toc06

TA = +85°C

MAX7304

I2C-Interfaced 16-Port,

CONSTANT-CURRENT GPIO OUTPUT

SINK CURRENT vs. OUTPUT VOLTAGE

CONSTANT-CURRENT GPIO OUTPUT SINK CURRENT (mA)

0 3.0

vs. OUTPUT VOLTAGE (PORT15–PORT12)

(PORT15–PORT12)

VCC = 2.4V

TA = -40°C

TA = +25°C

OUTPUT VOLTAGE (V)

CONSTANT-CURRENT GPIO

OUTPUT SINK CURRENT

VCC = 3.6V

TA = -40°C

TA = +25°C

MAX7304 toc05

TA = +85°C

2.52.01.51.00.5

MAX7304 toc07

TA = +85°C

CONSTANT-CURRENT GPIO OUTPUT SINK CURRENT (mA)

0 3.0

OUTPUT VOLTAGE (V)

2.52.01.51.00.5

CONSTANT-CURRENT GPIO OUTPUT SINK CURRENT (mA)

0 3.0

OUTPUT VOLTAGE (V)

2.52.01.51.00.5

_________________________________________________________________ Maxim Integrated Products 5

MAX7304

I2C-Interfaced 16-Port,

Level-Translating GPIO and LED Driver

with High Level of Integrated ESD Protection

Pin/Bump Configurations

TOP VIEW

PORT0

PORT1

PORT2

PORT3

GND

PORT4

INT

SCL

1718 16 14 13

MAX7304

456

SDA

*EP

AD0

(BUMPS SIDE DOWN)

1234

PORT8

PORT9

PORT10

PORT11

GND

PORT12

PORT4

GND

PORT3

PORT1

PORT5 PORT7 PORT14 PORT13

PORT6 PORT15 PORT12 GND

PORT2 GND PORT10 PORT11

MAX7304

SDA

PORT9

PORT6

PORT5

*CONNECT EP TO GROUND.

PORT7

TQFN

PORT15

PORT14

PORT13

PORT0

INT

SCL AD0 PORT8

WLP

Pin/Bump Description

PIN BUMP

TQFN WLP

1 A2 PORT5 GPIO Port 5. Push-pull I/O. 2 B2 PORT6 GPIO Port 6. Push-pull I/O. 3 A3 PORT7 GPIO Port 7. Push-pull I/O. 4 B3 PORT15 GPIO Port 15. Open-drain I/O. PORT15 can be configured as a constant-current sink. 5 A4 PORT14 GPIO Port 14. Open-drain I/O. PORT14 can be configured as a constant-current sink. 6 A5 PORT13 GPIO Port 13. Open-drain I/O. PORT13 can be configured as a constant-current sink. 7 B4 PORT12 GPIO Port 12. Open-drain I/O. PORT12 can be configured as a constant-current sink.

8, 23 B1, B5, C3 GND Ground

9 C5 PORT11 GPIO Port 11. Push-pull I/O. 10 C4 PORT10 GPIO Port 10. Push-pull I/O. 11 D5 PORT9 GPIO Port 9. Push-pull I/O. 12 E5 PORT8 GPIO Port 8. Push-pull I/O. 13 D4 V 14 E4 AD0 Address Input. Selects up to four device slave addresses (Table 2). 15 D3 SDA I2C-Compatible, Serial-Data I/O 16 E3 SCL I2C-Compatible Serial-Clock Input

17 E2

NAME FUNCTION

Second Logic Level for GPIO Level Shifting (where VCC P VLA P 3.6V)

INT Active-Low Key-Switch Interrupt Output. INT is open-drain and requires a pullup resistor.

_________________________________________________________________ Maxim Integrated Products 6

MAX7304

I2C-Interfaced 16-Port,

Level-Translating GPIO and LED Driver

with High Level of Integrated ESD Protection

Pin Description (continued)

PIN BUMP

TQFN WLP

18 D2 V

NAME FUNCTION

Positive Supply Voltage. Bypass to GND with a 0.1FF capacitor as close as possible to the device.

19 E1 PORT0 GPIO Port 0. Push-pull I/O. 20 D1 PORT1 GPIO Port 1. Push-pull I/O. 21 C2 PORT2 GPIO Port 2. Push-pull I/O. 22 C1 PORT3

GPIO Port 3. Push-pull I/

24 A1 PORT4 GPIO Port 4. Push-pull I/O.

— — EP

MAX7304

Exposed Pad (TQFN Only). Internally connected to GND. Connect to a large ground plane to maximize thermal performance. Not intended as an electrical connection point.

PWM

LOGIC

I/0 SUPPLY CONTROL

LED ENABLE

PWM SIGNAL

VCCV

Functional Diagram

INT

SDA

SCL

AD0

I2C

INTERFACE

BUS

TIMEOUT

128kHz

OSCILLATOR

CONTROL

REGISTERS

FIFO

POR

I/O

LOGIC

GPIO ENABLE

GPIO INPUT

GPIO OUTPUT

GPIO ENABLE

GPIO INPUT

GPIO OUTPUT

OPEN-DRAIN

GPIO/LED

DRIVERS

PUSH-PULL

GPIO

PORT15–PORT12

PORT11–PORT10

_________________________________________________________________ Maxim Integrated Products 7

MAX7304

I2C-Interfaced 16-Port,

Level-Translating GPIO and LED Driver

with High Level of Integrated ESD Protection

Detailed Description

constant-current and PWM intensity control. The maximum

constant-current level for each open-drain LED port is The MAX7304 is an I2C-interfaced 16-port GPIO expander. The device features 12 push-pull GPIOs configured for digital I/O and four open-drain GPIOs configurable as constant-current outputs for LED applications up to 5V. The device supports a second 1.62V to 3.6V power supply for level translation. The second logic supply

20mA. The intensity of the LED on each open-drain port

can be individually adjusted through a 256-step PWM

control. The port also features LED fading.

The device meets ESD requirements for Q8kV contact

discharge and Q15kV air-gap discharge on all port pins

(configured as GPIO and/or LED drivers). voltage (VLA) must be set equal to or higher than VCC.

Each GPIO can be programmed to one of the two externally applied logic voltage levels. PORT15–PORT12 can also be configured as LED drivers that feature

On power-up, all control registers reset to power-up

values (Table 1) and the device is in sleep mode.

Table 1. Register Address Map and Power-Up Conditions

ADDRESS

CODE (hex)

0x01 0x31 0x34 0x35

0x36

0x37

0x38

0x39

0x3A 0x3B 0x3C

0x40

0x42

0x43

0x45 0x48 Read only 0x00 I2C timeout flag I2C timeout since last POR 0x50 0x51 0x52 0x53

READ/

WRITE

R/W R/W R/W R/W

R/W

R/W R/W R/W

R/W

R/W R/W R/W R/W

POWER-UP

VALUE (hex)

0x0B Configuration Power-down and I2C timeout enable 0x00 LED driver enable LED driver enable register 0x00 GPIO direction 1 GPIO input/output control register 1 for PORT7–PORT0 0x00 GPIO direction 2 GPIO input/output control register 2 for PORT15–PORT8

0xFF GPO output mode 1

0x0F GPO output mode 2

0x00 GPIO supply voltage 1

0x00 GPIO supply voltage 2

0xFF GPIO values 1 Debounced input or output values of PORT7–PORT0 0xFF GPIO values 2 Debounced input or output values of PORT15–PORT8 0x00 GPIO level-shifter enable GPIO level-shifter pair enable

0x00

0x00 GPIO debounce PORT7–PORT0 debounce time setting

0xC0

0x00 Common PWM Common PWM duty-cycle setting

0x00 PORT12 PWM ratio PORT12 individual duty-cycle setting 0x00 PORT13 PWM ratio PORT13 individual duty-cycle setting 0x00 PORT14 PWM ratio PORT14 individual duty-cycle setting 0x00 PORT15 PWM ratio PORT15 individual duty-cycle setting

GPIO global

configuration

LED constant-current

setting

GPO open-drain/push-pull output setting for PORT7–PORT0

GPO open-drain/push-pull output setting for PORT15–PORT8

GPIO voltages supplied by VCC or VLA for PORT7–PORT0

GPIO voltages supplied by VCC or VLA for PORT15–PORT8

GPIO standby, GPIO reset, LED fade

PORT15–PORT12 constant-current output setting

Initial Power-Up

DESCRIPTION

_________________________________________________________________ Maxim Integrated Products 8

I2C-Interfaced 16-Port,

Level-Translating GPIO and LED Driver

with High Level of Integrated ESD Protection

Table 1. Register Address Map and Power-Up Conditions (continued)

MAX7304

ADDRESS

CODE (hex)

0x54

0x55

0x56

0x57

0x58 0x59

0x5A

0x5B

READ/ WRITE

R/W

R/W R/W

R/W

POWER-UP

VALUE (hex)

0x00

0xFF Interrupt mask 1 Interrupt mask for PORT7–PORT0 0xFF Interrupt mask 2 Interrupt mask for PORT15–PORT8

0x00 GPI trigger mode 1

0x00 GPI trigger mode 2

PORT12 LED configuration

PORT13 LED configuration

PORT14 LED configuration

PORT15 LED configuration

GPIOs

The device has 16 GPIO ports, of which four have LED control functions. The ports can be used as logic inputs and logic outputs. PORT15–PORT12 are also configurable as constant-current PWM LED drivers. Each ports’ logic level is referenced to VCC or VLA. The GPIO port’s inputs can also be debounced. When in PWM mode, the ports are set up to start their PWM cycle in 45N phase increments. This prevents large current spikes on the LED supply voltage when driving multiple LEDs.

Configuration Register (0x01)

The configuration register controls the I2C bus timeout feature (see Table 5 in the Register Tables section). The bus timeout feature prevents the SDA being held low when the SCL line hangs.

LED Driver Enable Register (0x31)

Bits D[3:0] correspond to PORT15–PORT12 on the device. Set the corresponding bit to 1 for enabling the LED driver circuitry and 0 for normal GPIO function (see

Table 6 in the Register Tables section).

GPIO Direction 1 and 2 Registers (0x34, 0x35)

These registers configure the pin as an input or an output. GPIO direction 1 register bits D[7:0] correspond with PORT7–PORT0 (see Table 7 in the Register Tables section). GPIO direction 2 register bits D[7:0] correspond with PORT15–PORT8 (see Table 8 in the Register Tables section). Set the corresponding bit to 0 to configure as input and 1 to configure as output.

DESCRIPTION

PORT12 interrupt, PWM mode control, and blinkperiod settings

PORT13 interrupt, PWM mode control, and blinkperiod settings

PORT14 interrupt, PWM mode control, and blinkperiod settings

PORT15 interrupt, PWM mode control, and blinkperiod settings

GPI edge-triggered detection setting for PORT7–PORT0

GPI edge-triggered detection setting for PORT15–PORT8

When the port is initially programmed as an input, there

is a delay of one debounce period prior to detecting

a transition on the input port. This is to prevent a false

interrupt from occurring when changing a port from an

output to an input.

GPO Output Mode 1 and 2 Registers (0x36, 0x37)

These registers configure the pins as an open-drain or

push-pull output. GPO output mode 1 register bits D[7:0]

correspond with PORT7–PORT0 (see Table 9 in the

bits D[7:0] correspond with PORT15–PORT8 (see Table

10 in the Register Tables section). Set the corresponding

bit to 0 to configure the output mode as open-drain and

1 to configure the output mode as push-pull.

GPIO Supply Voltage 1 and 2

Registers (0x38, 0x39)

These registers configure input and output voltages

to be referenced to VCC or VLA. GPIO supply voltage

1 register bits D[7:0] correspond with PORT7–PORT0

(see Table 11 in the Register Tables section). GPIO

supply voltage 2 register bits D[7:0] correspond with

PORT15–PORT8 (see Table 12 in the Register Tables

section). Set the bit to 0 for input/output voltages

referenced to VCC and set the bit to 1 for the input/output

voltage referenced to VLA.

_________________________________________________________________ Maxim Integrated Products 9

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