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General Description

The MAX7313 I

C™-compatible serial interfaced

peripheral provides microprocessors with 16 I/O ports.

Each I/O port can be individually configured as either

an open-drain current-sinking output rated at 50mA and

5.5V, or a logic input with transition detection. A 17th

port can be used for transition detection interrupt, or as

a general-purpose output. The outputs are capable of

driving LEDs, or providing logic outputs with external

resistive pullup up to 5.5V.

PWM current drive is integrated with 8 bits of control.

Four bits are global control and apply to all LED outputs

to provide coarse adjustment of current from fully off to

fully on with 14 intensity steps in between. Each output

then has individual 4-bit control, which further divides

the globally set current into 16 more steps.

Alternatively, the current control can be configured as a

single 8-bit control that sets all outputs at once.

The MAX7313 is pin and software compatible with the

MAX7311, PCA9535, and PCA9555.

Each output has independent blink timing with two blink

phases. All LEDs can be individually set to be on or off

during either blink phase, or to ignore the blink control.

The blink period is controlled by a register.

The MAX7313 is controlled through the 2-wire

C/SMBus serial interface, and can be configured to

any one of 64 I

C addresses.

Applications

Features

♦ 400kbs, 2-Wire Serial Interface, 5.5V Tolerant

♦ 2V to 3.6V Operation

♦ Overall 8-Bit PWM LED Intensity Control

Global 16-Step Intensity Control

Individual 16-Step Intensity Controls

♦ Two-Phase LED Blinking

♦ 50mA Maximum Port Output Current

♦ Outputs are 5.5V-Rated Open Drain

♦ Inputs are Overvoltage Protected to 5.5V

♦ Transition Detection with Interrupt Output

♦ 1.2µA (typ), 3.6µA (max) Standby Current

♦ Tiny 4mm x 4mm Thin QFN Package

♦ -40°C to +125°C Temperature Range

♦ All Ports Can Be Configured as Inputs or Outputs

MAX7313

16-Port I/O Expander with LED Intensity

Control and Interrupt

________________________________________________________________ Maxim Integrated Products 1

AD2

AD1

V+

SDA

P10

AD0

192021222324

SCL

P15

P14

P13

P12

P11

GND

8 9 10 11 12

INT/O16

TOP VIEW

QFN

MAX7313ATG

Pin Configurations

MAX7313

P10

V+

3.3V

µC

SDA

SCL

SDA

I/O

AD0

5V 3.3V

P11

P12

P13

P14

P15

SCL

OUTPUT 11

OUTPUT 10

GND

INPUT 1

INPUT 2

INPUT 3

INPUT 4

INPUT 5

AD2

AD1

0.047µF

INT/O16

Typical Application Circuit

19-3059; Rev 0; 10/03

For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at

1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.

Ordering Information

PART TEMP RANGE PIN-PACKAGE

MAX7313ATG -40°C to +125°C

24 Thin QFN

4mm x 4mm x 0.8mm

MAX7313AEG -40°C to +125°C 24 QSOP

Pin Configurations continued at end of data sheet.

LCD Backlights

LED Status Indication

Portable Equipment

Keypad Backlights

RGB LED Drivers

Notebook Computers

Purchase of I

C components of Maxim Integrated Products, Inc.,

or one of its sublicensed Associated Companies, conveys a

license under the Philips I

C Patent Rights to use these compo-

nents in an I

C system, provided that the system conforms to the

C Standard Specification as defined by Philips.

Summary of content (27 pages)

PAGE 1
9-3059; Rev 0; 10/03 16-Port I/O Expander with LED Intensity Control and Interrupt The MAX7313 serial interfaced peripheral provides microprocessors with 16 I/O ports. Each I/O port can be individually configured as either an open-drain current-sinking output rated at 50mA and 5.5V, or a logic input with transition detection. A 17th port can be used for transition detection interrupt, or as a general-purpose output.
PAGE 2
MAX7313 16-Port I/O Expander with LED Intensity Control and Interrupt ABSOLUTE MAXIMUM RATINGS Voltage (with respect to GND) V+ .............................................................................-0.3V to +4V SCL, SDA, AD0, AD1, AD2, P0–P15 ........................-0.3V to +6V INT/O16 ....................................................................-0.3V to +8V DC Current on P0–P15, INT/O16 ........................................55mA DC Current on SDA...........................................
PAGE 3
16-Port I/O Expander with LED Intensity Control and Interrupt (Typical Operating Circuit, V+ = 2V to 3.6V, TA = TMIN to TMAX, unless otherwise noted. Typical values are at V+ = 3.3V, TA = + 25°C.) (Note 1) PARAMETER SYMBOL CONDITIONS MIN TA = +25°C V+ = 2V, ISINK = 20mA TYP MAX 0.15 0.26 TA = -40°C to +85°C 0.3 TA = TMIN to TMAX 0.32 TA = +25°C Output Low Voltage P0–P15, INT/O16 VOL V+ = 2.5V, ISINK = 20mA 0.13 Output Low-Voltage SDA PWM Clock Frequency VOLSDA 0.
PAGE 4
TIMING CHARACTERISTICS (continued) (Typical Operating Circuit, V+ = 2V to 3.6V, TA = TMIN to TMAX, unless otherwise noted. Typical values are at V+ = 3.3V, TA = +25°C.) (Note 1) PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS Interrupt Valid tIV Figure 10 6.5 µs Interrupt Reset tIR Figure 10 1 µs Output Data Valid tDV Figure 10 5 µs Input Data Step Time tDS Figure 10 100 ns Input Data Hold Time tDH Figure 10 1 µs Note 1: All parameters tested at TA = +25°C.
PAGE 5
16-Port I/O Expander with LED Intensity Control and Interrupt PORT OUTPUT LOW VOLTAGE WITH 20mA LOAD CURRENT vs. TEMPERATURE V+ = 2.7V V+ = 2V 0.3 0.2 V+ = 3.6V 0.1 0 0.4 V+ = 2V 0.2 0.1 V+ = 2.7V 1.025 MAX7313 toc06 0.5 0.3 1.050 V+ = 3.6V 1.000 0.975 V+ = 2V V+ = 2.7V 0.950 0.925 V+ = 3.6V NORMALIZED TO V+ = 3.3V, TA = +25°C 0.
PAGE 6
16-Port I/O Expander with LED Intensity Control and Interrupt MAX7313 Pin Description PIN NAME FUNCTION QSOP QFN 1 22 INT/O16 21, 2, 3 18, 23, 24 AD0, AD1, AD2 4–11, 13–20 1–8, 10–17 P0–P15 12 9 GND Ground. Do not sink more than 350mA into the GND pin. 22 19 SCL I2C-Compatible Serial Clock Input 23 20 SDA I2C-Compatible Serial Data I/O 24 21 V+ — PAD EXPOSED PAD Output Port. Open-drain output rated at 7V, 50mA. Configurable as interrupt output or general-purpose output.
PAGE 7
16-Port I/O Expander with LED Intensity Control and Interrupt Port Output Control and LED Blinking The two blink phase 0 registers set the output logic levels of the 16 ports P0–P15 (Table 8). These registers control the port outputs if the blink function is disabled. A duplicate pair of registers, the blink phase 1 registers, are also used if the blink function is enabled (Table 9).
PAGE 8
MAX7313 16-Port I/O Expander with LED Intensity Control and Interrupt only as an input. A pullup resistor, typically 4.7kΩ, is required on SCL if there are multiple masters on the 2wire interface, or if the master in a single-master system has an open-drain SCL output. Each transmission consists of a START condition (Figure 3) sent by a master, followed by the MAX7313 7-bit slave address plus R/W bit, a register address byte, one or more data bytes, and finally a STOP condition (Figure 3).
PAGE 9
16-Port I/O Expander with LED Intensity Control and Interrupt PIN AD2 PIN AD1 MAX7313 Table 1.
PAGE 10
MAX7313 16-Port I/O Expander with LED Intensity Control and Interrupt Table 1.
PAGE 11
16-Port I/O Expander with LED Intensity Control and Interrupt S SLAVE ADDRESS 0 D15 D14 D13 A D12 D11 D10 D9 D8 COMMAND BYTE R/W MAX7313 COMMAND BYTE IS STORED ON RECEIPT OF STOP CONDITION ACKNOWLEDGE FROM MAX7313 A P ACKNOWLEDGE FROM MAX7313 Figure 7.
PAGE 12
MAX7313 16-Port I/O Expander with LED Intensity Control and Interrupt WRITE TO OUTPUT PORTS REGISTERS (BLINK PHASE 0 REGISTERS/BLINK PHASE 1 REGISTERS) SCL 1 2 3 4 5 6 7 8 9 SDA S A6 A5 A4 A3 A2 A1 A0 0 A SLAVE ADDRESS COMMAND BYTE 0 0 0 0 0 0 0 1 R/W ACKNOWLEDGE FROM SLAVE START CONDITION A MSB DATA1 ACKNOWLEDGE FROM SLAVE LSB A MSB LSB A DATA2 ACKNOWLEDGE FROM SLAVE P7–P0 P STOP CONDITION DATA1 VALID tDV P15– P8 DATA2 VALID tDV READ FROM INPUT PORTS REGISTERS SCL 1
PAGE 13
16-Port I/O Expander with LED Intensity Control and Interrupt MAX7313 Table 2.
PAGE 14
Table 3.
PAGE 15
16-Port I/O Expander with LED Intensity Control and Interrupt D5 D4 D0 BLINK ENABLE D1 BLINK FLIP D2 GLOBAL INTENSITY D3 INTERRUPT ENABLE D6 INTERRUPT OUTPUT CONTROL AS GPO D7 — REGISTER DATA INTERRUPT STATUS ADDRESS CODE (HEX) REGISTER O1 O0 I G B E X X X X 0 X X X X X X X 1 X X X X X X 0 X X X X X X X 1 X X X — X X X 0 0 X X 0 INT/O16 output is high impedance (blink is disabled) — X X X 1 0 X X 0 INT/O16 output is low during blink phas
PAGE 16
MAX7313 16-Port I/O Expander with LED Intensity Control and Interrupt Table 5. Ports Configuration Registers REGISTER R/W Ports configuration P7–P0 (1 = input, 0 = output) 0 Read back ports configuration P7–P0 1 Ports configuration P15–P8 (1 = input, 0 = output) 0 Read back ports configuration P15–P8 1 ADDRESS CODE (HEX) REGISTER DATA D7 D6 D5 D4 D3 D2 D1 D0 0x06 OP7 OP6 OP5 OP4 OP3 OP2 OP1 OP0 0x07 OP15 OP14 OP13 OP12 OP11 OP10 OP9 OP8 Table 6.
PAGE 17
16-Port I/O Expander with LED Intensity Control and Interrupt Each PWM output has an individual 4-bit intensity control (Table 14). When all outputs are to be used with the same PWM setting, the outputs can be controlled together instead using the global intensity control (Table 13). Table 10 shows how to set up the MAX7313 to suit a particular application. PWM Timing The PWM control uses a 240-step PWM period, divided into 15 master intensity timeslots.
PAGE 18
MAX7313 16-Port I/O Expander with LED Intensity Control and Interrupt Table 10. PWM Application Scenarios APPLICATION RECOMMENDED CONFIGURATION All outputs static without PWM Set the master, O16 intensity register 0x0E to any value 0x00 to 0x0F. The global intensity G bit in the configuration register is don't care. The output intensity registers 0x10 through 0x17 are don't care.
PAGE 19
16-Port I/O Expander with LED Intensity Control and Interrupt 1 2 3 4 5 6 7 8 MAX7313 MASTER INTENSITY TIMESLOT NEXT MASTER INTENSITY TIMESLOT 9 10 11 12 13 14 15 16 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 Figure 15. Individual (or Global) Set to 1/16 MASTER INTENSITY TIMESLOT 1 2 3 4 5 6 7 8 NEXT MASTER INTENSITY TIMESLOT 9 10 11 12 13 14 15 16 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 Figure 16.
PAGE 20
MAX7313 16-Port I/O Expander with LED Intensity Control and Interrupt Using PWM Intensity Controls with Blink Disabled When blink is disabled (Table 7), the blink phase 0 registers specify each output’s logic level during the PWM on-time (Table 8). The effect of setting an output’s blink phase 0 register bit to 0 or 1 is shown in Table 11.
PAGE 21
16-Port I/O Expander with LED Intensity Control and Interrupt REGISTER R/W ADDRESS CODE (HEX) REGISTER DATA D7 D6 D5 MSB MASTER AND GLOBAL INTENSITY D4 D3 LSB MSB MASTER INTENSITY Write master and global intensity 0 Read back master and global intensity 1 Master intensity duty cycle is 0/15 (off); internal oscillator is disabled; all outputs will be static with no PWM D2 D1 D0 LSB GLOBAL INTENSITY M3 M2 M1 M0 G3 G2 G1 G0 — 0 0 0 0 — — — — Master intensity duty cycle is
PAGE 22
MAX7313 16-Port I/O Expander with LED Intensity Control and Interrupt Table 14.
PAGE 23
16-Port I/O Expander with LED Intensity Control and Interrupt ADDRESS CODE (HEX) R/W REGISTER REGISTER DATA D7 D6 D5 MSB OUTPUTS P9, P8 INTENSITY Write output P9, P8 intensity 0 Read back output P9, P8 intensity 1 P9I3 P9I2 P911 MSB Write output P11, P10 intensity 0 Read back output P11, P10 intensity 1 P11I3 P11I2 P11I1 MSB Write output P13, P12 intensity 0 Read back output P13, P12 intensity 1 P13I3 P13I2 P13I1 MSB Write output P15, P14intensity 0 Read back output P15, P14
PAGE 24
MAX7313 16-Port I/O Expander with LED Intensity Control and Interrupt where: RLED is the resistance of the resistor in series with the LED (Ω). VSUPPLY is the supply voltage used to drive the LED (V). VLED is the forward voltage of the LED (V). VOL is the output low voltage of the MAX7313 when sinking ILED (V). ILED is the desired operating current of the LED (A). Pin Configurations (continued) TOP VIEW INT/O16 1 24 V+ AD1 2 23 SDA AD2 3 22 SCL P0 4 21 AD0 MAX7313AEG For example, to operate a 2.
PAGE 25
16-Port I/O Expander with LED Intensity Control and Interrupt QSOP.EPS PACKAGE OUTLINE, QSOP .150", .025" LEAD PITCH 21-0055 E 1 ______________________________________________________________________________________ 1 25 MAX7313 Package Information (The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information, go to www.maxim-ic.com/packages.
PAGE 26
Package Information (continued) (The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information, go to www.maxim-ic.com/packages.) 24L QFN THIN.EPS MAX7313 16-Port I/O Expander with LED Intensity Control and Interrupt PACKAGE OUTLINE 12,16,20,24L QFN THIN, 4x4x0.
PAGE 27
16-Port I/O Expander with LED Intensity Control and Interrupt PACKAGE OUTLINE 12,16,20,24L QFN THIN, 4x4x0.8 mm 21-0139 A 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.