Datasheet

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General Description

The MAX7315 I

C-/SMBus-compatible serial interfaced

peripheral provides microprocessors with 8 I/O ports.

Each I/O port can be individually configured as either an

open-drain current-sinking output rated at 50mA at 5.5V,

or a logic input with transition detection. A ninth port can

be used for transition detection interrupt or as a general-

purpose output. The outputs are capable of directly dri-

ving 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 in 14 intensity steps. Each output then has indi-

vidual 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 MAX7315 is pin and software compatible with the

PCA9534 and PCA9554(A).

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 MAX7315 supports hot insertion. All port pins, the INT

output, SDA, SCL, and the slave address inputs ADO-2

remain high impedance in power-down (V+ = 0V) with up

to 6V asserted upon them.

The MAX7315 is controlled through the 2-wire I

C/SMBus

serial interface, and can be configured to one of 64 I

addresses.

Applications

Features

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

♦ 2V to 3.6V Operation

♦ Overall 8-Bit PWM LED Intensity Control

Global 16-Step Intensity Control

Plus Individual 16-Step Intensity Control

♦ Automatic Two-Phase LED Blinking

♦ 50mA Maximum Port Output Current

♦ Supports Hot Insertion

♦ Outputs Are 5.5V-Rated Open Drain

♦ Inputs Are Overvoltage Protected to 5.5V

♦ Transition Detection with Interrupt Output

♦ Low Standby Current (1.2µA typ; 3.3µA max)

♦ Tiny 3mm x 3mm, Thin QFN Package

♦ -40°C to +125°C Temperature Range

♦ All Ports Can Be Configured as Inputs or Outputs

MAX7315

8-Port I/O Expander with LED Intensity

Control, Interrupt, and Hot-Insertion Protection

________________________________________________________________ Maxim Integrated Products 1

12 11 10 9

INT/O8

GND

16

15

14

13

AD1

ADO

V+

1234

AD2

SDA

SCL

THIN QFN



TOP VIEW

MAX7315ATE

Pin Configurations

19-3056; Rev 3; 1/05

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.

EVALUATION KIT

AVAILABLE

Ordering Information

PART

TEMP

RANGE

PIN-

PACKAGE

TOP

MARK

PKG

CODE

MAX7315ATE -40°C to +125°C

16 Thin QFN

3mm x 3mm

x 0.8mm

AAU T1633-4

MAX7315AEE -40°C to +125°C

16 QSOP

— —

MAX 7315AU E -40°C to +125°C

16 TSSOP

— —

Pin Configurations continued at end of data sheet.

LCD Backlights

LED Status Indication

Portable Equipment

Laptop Computers

Keypad Backlights

RGB LED Drivers

Cellular Phones

Typical Application Circuit appears at end of data sheet.

Summary of content (26 pages)

PAGE 1
9-3056; Rev 3; 1/05 KIT ATION EVALU BLE A IL A V A 8-Port I/O Expander with LED Intensity Control, Interrupt, and Hot-Insertion Protection Features ♦ 400kbps, 2-Wire Serial Interface, 5.5V Tolerant ♦ 2V to 3.6V Operation ♦ Overall 8-Bit PWM LED Intensity Control Global 16-Step Intensity Control Plus Individual 16-Step Intensity Control ♦ Automatic Two-Phase LED Blinking ♦ 50mA Maximum Port Output Current ♦ Supports Hot Insertion ♦ Outputs Are 5.5V-Rated Open Drain ♦ Inputs Are Overvoltage Protected to 5.
PAGE 2
MAX7315 8-Port I/O Expander with LED Intensity Control, Interrupt, and Hot-Insertion Protection ABSOLUTE MAXIMUM RATINGS Voltage (with respect to GND) V+ .............................................................................-0.3V to +4V SCL, SDA, AD0, AD1, AD2, P0–P7 ..........................-0.3V to +6V INT/O8 .....................................................................-0.3V to +8V DC Current on P0–P7, INT/O8 ............................................55mA DC Current on SDA..............
PAGE 3
8-Port I/O Expander with LED Intensity Control, Interrupt, and Hot-Insertion Protection (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 0.25 TA = -40°C to +85°C 0.29 TA = TMIN to TMAX 0.31 TA = +25°C Output Low Voltage P0–P7, INT/O8 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 Setup 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
8-Port I/O Expander with LED Intensity Control, Interrupt, and Hot-Insertion Protection V+ = 2V 0.3 0.2 V+ = 3.6V 0.1 0.5 0.4 0.3 V+ = 2V 0.2 0.1 0 V+ = 2.7V 1.025 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
8-Port I/O Expander with LED Intensity Control, Interrupt, and Hot-Insertion Protection MAX7315 Pin Description PIN NAME FUNCTION QSOP/TSSOP QFN 1, 2, 3 15, 16, 1 AD0, AD1, AD2 4–7, 9–12 2–5, 7–10 P0–P7 8 6 GND 13 11 INT/O8 14 12 SCL I2C-Compatible Serial Clock Input 15 13 SDA I2C-Compatible Serial Data I/O 16 14 V+ — PAD Exposed pad Address Inputs. Sets device slave address. Connect to either GND, V+, SCL, or SDA to give 64 logic combinations. See Table 1. Input/Output Ports.
PAGE 7
8-Port I/O Expander with LED Intensity Control, Interrupt, and Hot-Insertion Protection PWM intensity control uses a 4-bit master control and 4 bits of individual control per output (Tables 13, 14). The 4-bit master control provides 16 levels of overall intensity control, which applies to all PWM-enabled output ports. The master control sets the maximum pulse width from 1/15 to 15/15 of the PWM time period.
PAGE 8
MAX7315 8-Port I/O Expander with LED Intensity Control, Interrupt, and Hot-Insertion Protection 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.
PAGE 9
8-Port I/O Expander with LED Intensity Control, Interrupt, and Hot-Insertion Protection PIN AD2 PIN AD1 MAX7315 Table 1.
PAGE 10
MAX7315 8-Port I/O Expander with LED Intensity Control, Interrupt, and Hot-Insertion Protection Table 1.
PAGE 11
8-Port I/O Expander with LED Intensity Control, Interrupt, and Hot-Insertion Protection S SLAVE ADDRESS 0 D15 D14 D13 A D12 D11 D10 D9 D8 COMMAND BYTE R/W MAX7315 COMMAND BYTE IS STORED ON RECEIPT OF STOP CONDITION ACKNOWLEDGE FROM MAX7315 A P ACKNOWLEDGE FROM MAX7315 Figure 7.
PAGE 12
MAX7315 8-Port I/O Expander with LED Intensity Control, Interrupt, and Hot-Insertion Protection WRITE TO OUTPUT PORTS REGISTERS (BLINK PHASE 0 REGISTERS/BLINK PHASE 1 REGISTERS) 7 8 9 SDA S A6 A5 A4 A3 A2 A1 A0 0 A SCL 1 2 3 4 5 6 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 DATA1 VALID tDV P STOP CONDITION DATA2 VALID tDV READ FROM INPUT PORTS
PAGE 13
8-Port I/O Expander with LED Intensity Control, Interrupt, and Hot-Insertion Protection ADDRESS CODE (HEX) REGISTER AUTOINCREMENT ADDRESS Read input ports 0x00 0x00 (no change) Blink phase 0 outputs 0x01 0x01 (no change) Ports configuration 0x03 0x03 (no change) Blink phase 1 outputs 0x09 0x09 (no change) Master, O8 intensity 0x0E 0x0E (no change) Configuration 0x0F 0x0F (no change) Outputs intensity P1, P0 0x10 0x11 Outputs intensity P3, P2 0x11 0x12 Outputs intensity P5, P4 0x1
PAGE 14
Table 3.
PAGE 15
8-Port I/O Expander with LED Intensity Control, Interrupt, and Hot-Insertion Protection REGISTER DATA Enable data change interrupt—INT/O8 output is controlled by port input data change — X D1 D0 BLINK ENABLE INT D2 BLINK FLIP — D3 GLOBAL INTENSITY Disable data change interrupt—INT/O8 output is controlled by the O0 and O1 bits CONFIGURATION D4 INTERRUPT ENABLE R/W D5 INTERRUPT OUTPUT CONTROL AS GPO D6 INTERRUPT STATUS D7 O1 O0 I G B E X X X 1 X X X — ADDRESS CODE (HEX) RE
PAGE 16
MAX7315 8-Port I/O Expander with LED Intensity Control, Interrupt, and Hot-Insertion Protection Table 5. Ports Configuration Register REGISTER R/W Ports configuration (1 = input, 0 = output) 0 Read-back ports configuration 1 ADDRESS CODE (HEX) 0x03 REGISTER DATA D7 D6 D5 D4 D3 D2 D1 D0 OP7 OP6 OP5 OP4 OP3 OP2 OP1 OP0 Table 6.
PAGE 17
8-Port I/O Expander with LED Intensity Control, Interrupt, and Hot-Insertion Protection Output Level Translation The open-drain output architecture allows the ports to level translate the outputs to higher or lower voltages than the MAX7315 supply. An external pullup resistor can be used on any output to convert the high-impedance logic-high condition to a positive voltage level. The resistor can be connected to any voltage up to 5.5V.
PAGE 18
MAX7315 8-Port I/O Expander with LED Intensity Control, Interrupt, and Hot-Insertion Protection Table 10. PWM Application Scenarios APPLICATION RECOMMENDED CONFIGURATION All outputs static without PWM Set the master, O8 intensity register 0x0E to any value from 0x00 to 0x0F. The global intensity G bit in the configuration register is don't care. The output intensity registers 0x10 through 0x13 are don't care.
PAGE 19
8-Port I/O Expander with LED Intensity Control, Interrupt, and Hot-Insertion Protection 2 3 4 5 6 7 8 MAX7315 MASTER INTENSITY TIMESLOT 1 NEXT MASTER INTENSITY TIMESLOT 9 10 11 12 13 14 15 16 1 2 3 4 5 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 6 7 8 9 10 11 12 13 14 15 16 7 8 Figure 16.
PAGE 20
MAX7315 8-Port I/O Expander with LED Intensity Control, Interrupt, and Hot-Insertion Protection 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 MAX7315 when sinking ILED (V). ILED is the desired operating current of the LED (A). For example, to operate a 2.2V red LED at 14mA from a 5V supply, RLED = (5 - 2.2 - 0.25) / 0.014 = 182Ω.
PAGE 21
8-Port I/O Expander with LED Intensity Control, Interrupt, and Hot-Insertion Protection 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 O8 INTENSITY M3 M2 M1 M0 G3 G2 G1 G0 — 0 0 0 0 — — — — Master i
PAGE 22
MAX7315 8-Port I/O Expander with LED Intensity Control, Interrupt, and Hot-Insertion Protection Table 14.
PAGE 23
8-Port I/O Expander with LED Intensity Control, Interrupt, and Hot-Insertion Protection PCA9534, PCA9554(A) REGISTER ADDRESS MAX7311, PCA9535, PCA9555 IMPLEMENTATION MAX7313 IMPLEMENTATION COMMENTS Inputs 0x00 Inputs registers Implemented Same functionality Outputs 0x01 Blink phase 0 registers Implemented Same functionality Polarity inversion 0x02 Not implemented; register writes are ignored; register reads return 0x00 Implemented; power-up default is 0x00 If polarity inversion feature is
PAGE 24
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.) QSOP.
PAGE 25
8-Port I/O Expander with LED Intensity Control, Interrupt, and Hot-Insertion Protection 12x16L QFN THIN.EPS (NE - 1) X e E MARKING E/2 D2/2 (ND - 1) X e AAAA D/2 e CL D D2 k CL b 0.10 M C A B E2/2 L E2 C L 0.10 C C L 0.08 C A A2 A1 L L e e PACKAGE OUTLINE 8, 12, 16L THIN QFN, 3x3x0.8mm 21-0136 PKG 8L 3x3 REF. 12L 3x3 16L 3x3 MIN. NOM. MAX. MIN. NOM. MAX. 0.70 0.75 0.80 0.70 0.75 0.80 0.70 0.75 0.80 b 0.25 0.30 0.35 0.20 0.25 0.30 0.20 0.25 0.30 D 2.
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.) TSSOP4.40mm.EPS MAX7315 8-Port I/O Expander with LED Intensity Control, Interrupt, and Hot-Insertion Protection PACKAGE OUTLINE, TSSOP 4.40mm BODY 21-0066 I 1 1 Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product.