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General Description

The MAX11041/MAX11042 wired remote controllers

convert up to six or 30 different pushbuttons into an

C* register. Together with low-cost pushbutton switch-

es and 1% resistors, the MAX11041/MAX11042 are

total solutions over a single-wire interface. A wired

remote controller easily piggybacks to a standard

3.5mm headphone jack using a fourth contact or one of

the audio signals.

To conserve battery life, the MAX11041/MAX11042

consume only 5µA (typ) while reading keypresses in

real time without microprocessor (µP) polling. The

devices send the debounced keypress along with key

duration to the application processor over the I

C inter-

face. An 8-word FIFO buffer records up to four key-

press events to allow plenty of time for the application

processor to respond to the MAX11041/MAX11042.

The MAX11041/MAX11042 include ±15kV ESD protec-

tion devices on the FORCE and SENSE inputs to ensure

IEC 61000-4-2 compliance without any external

ESD devices.

The MAX11041/MAX11042 are available in 12-bump

UCSP™ and 12-pin TQFN packages. The devices are

specified over the extended temperature range

(-40°C to +85°C).

Applications

Features

♦ Detect Up to Six (MAX11042) or 30 (MAX11041)

Different Keys and Jack Insertion/Removal

♦ Work with Either 32Ω or 16Ω Headphones

♦ Add Remote-Control Functionality to Devices

Using a Simple Resistor and Switch Array

♦ Low-Power Operation Consuming a Supply

Current of Only 5µA (typ)

♦ Work with Standard 2.5mm or 3.5mm 4-Pin

Headphone Jacks

♦ Support Hold Function to Lockout Keys

♦ 100kHz/400kHz I

C Interface

♦ Single 1.6V to 3.6V Supply Voltage Range

♦ ±15kV ESD Protection (IEC 61000-4-2)

MAX11041/MAX11042

Wired Remote Controllers

________________________________________________________________ Maxim Integrated Products 1

19-3984; Rev 0; 1/06

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.

SENSE

GND

SCL

SHDN

SDA

987

FORCE

N.C.

MAX11041

MAX11042

INT

THIN QFN

(4mm x 4mm x 0.6mm)

TOP VIEW

EXPOSED PAD CONNECTED TO GND.

Pin Configurations

Ordering Information

UCSP is a trademark of Maxim Integrated Products, Inc.

*Purchase of I

C components from Maxim Integrated Products,

Inc., or one of its sublicensed Associated Companies, conveys

a license under the Philips I

C Patent Rights to use these com-

ponents in an I

C system, provided that the system conforms

to the I

C Standard Specification as defined by Philips.

*EP = Exposed pad.

**Future product—contact factory for availability.

Pin Configurations continued at end of data sheet.

Multimedia Controls for

Multimedia-Enabled

Cell Phones

Keyboard Encoder for

Slider, Flip, and other

Cell Phones

Portable Media Players

MP3, CD, DVD Players

PDAs

Digital Still Cameras

PDA Accessory

Keyboards

Multimedia Desktop

Speakers

Portable Game

Consoles

PART

TEMP

RANGE

PIN-

PACKAGE

PKG

CODE

MAX11041ETC -40°C to +85°C 12 TQFN-EP* T1244-4

M AX 11041E BC - T** -40°C to +85°C

12 UCSP

(4 x 4 Array)

B16-5

MAX11042ETC** -40°C to +85°C 12 TQFN-EP* T1244-4

M AX 11042E BC - T** -40°C to +85°C

12 UCSP

(4 x 4 Array)

B16-5

Summary of content (18 pages)

PAGE 1
9-3984; Rev 0; 1/06 Wired Remote Controllers Applications Multimedia Controls for Multimedia-Enabled Cell Phones Keyboard Encoder for Slider, Flip, and other Cell Phones Portable Media Players MP3, CD, DVD Players PDAs Digital Still Cameras PDA Accessory Keyboards Multimedia Desktop Speakers Portable Game Consoles ♦ Add Remote-Control Functionality to Devices Using a Simple Resistor and Switch Array ♦ Low-Power Operation Consuming a Supply Current of Only 5µA (typ) ♦ Work with Standard 2.5mm or 3.
PAGE 2
MAX11041/MAX11042 Wired Remote Controllers ABSOLUTE MAXIMUM RATINGS VDD to GND ...........................................................-0.3V to +4.0V INT to GND .................................................-0.3V to (VDD + 0.3V) SCL, SDA, A1, A0, SHDN to GND.........................-0.3V to +4.0V FORCE, SENSE to GND.........................................................±6V Current into Any Pin..........................................................
PAGE 3
Wired Remote Controllers (VDD = +1.6V to 3.6V, CSENSE = 10nF, RSENSE = 10kΩ, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25°C.) PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS DIGITAL OUTPUTS (SDA, INT) ISOURCE ≤ 2mA Output High Voltage (INT) VOH Output Low Voltage (INT) VOLINT ISINK ≤ 2mA IOHL VOUT = VDD Output High Leakage Current Output Low Voltage (SDA) VOLSDA 0.9 x VDD V 0.1 x VDD V 1 µA IOL = 3mA for VDD > 2V 0.4 V IOL = 3mA for VDD < 2V 0.
PAGE 4
MAX11041/MAX11042 Wired Remote Controllers ELECTRICAL CHARACTERISTICS (continued) (VDD = +1.6V to 3.6V, CSENSE = 10nF, RSENSE = 10kΩ, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25°C.) PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS 3.6 V POWER SUPPLIES Power-Supply Voltage VDD Average Operational Supply Current IDDOP 1.
PAGE 5
Wired Remote Controllers DEBOUNCE SCOPE SHOT (RISING) DEBOUNCE SCOPE SHOT (FALLING) MAX11041/42 TOC01 MAX11041/42 TOC03 VSENSE VSENSE VSENSE µP READS FIFO DEBOUNCED KEY ADDED TO FIFO INT DEBOUNCE KEY ADDED TO FIFO 10ms/div µP READS FIFO INT DEBOUNCE KEY ADDED TO FIFO 10ms/div 10ms/div VDD SHUTDOWN SUPPLY CURRENT vs. VOLTAGE VDD SUPPLY CURRENT vs. VOLTAGE 1.00 MAX11041/42 TOC04 7.0 NO JACK INSERTED 6.
PAGE 6
Wired Remote Controllers MAX11041/MAX11042 Pin Description PIN NAME TQFN UCSP 1 D1 GND FUNCTION Ground 2 C1 SENSE Voltage Sense Input. Connect SENSE to FORCE through an external lowpass filter composed of RSENSE and CSENSE (see the FORCE and SENSE section). There is a ±15kV IEC61000-4-2 ESD protection on SENSE. 3, 11 B1, D3 VDD Power-Supply Input. Connect both VDD inputs together and bypass each VDD with a 0.1µF capacitor to GND. 4 A1 N.C. 5 A2 A1 I2C Address Input 1.
PAGE 7
Wired Remote Controllers MAX11041/MAX11042 WIRED REMOTE CONTROLLER TO AUDIO CIRCUIT RSW0 FORCE MAX11041 MAX11042 10kΩ RSENSE SENSE RSW1 JACK/PLUG CONNECTION CSENSE 10nF RSW30 RJACK HOLD SWITCH Figure 2. Recommended FORCE and SENSE Configuration Table 1.
PAGE 8
MAX11041/MAX11042 Wired Remote Controllers Table 3. Chip ID Data Format BIT NAMES CHIP ID I7 I6 I5 I4 I3 I2 I1 I0 MAX11041 0 0 0 0 0 0 0 0 MAX11042 0 0 0 0 0 0 0 1 Keypress Detection and Debounce At power-up, the MAX11041/MAX11042 begin to monitor the SENSE input for keypresses. When the MAX11041/MAX11042 detect a keypress at SENSE, they attempt to debounce the SENSE input. After successful debouncing of the input, the corresponding keypress result is inserted into the FIFO.
PAGE 9
Wired Remote Controllers ADDRESS BYTE 0 START S 5 BITS A1 A0 R/W ACK CONTROL REG DATA BYTE 1 ACK STOP 0 A C7–C0 A P SLAVE TO MASTER MASTER TO SLAVE READ FORMAT START S ADDRESS BYTE 0 5 BITS A1 A0 R/W ACK 1 A CHIP ID BYTE 1 I7–I0 ACK CONTROL REG DATA BYTE 2 ACK KEY TYPE BYTE 3 ACK KEY DURATION BYTE 4 ACK STOP A C7–C0 A K7–K0 A OF, T6–T0 A P Figure 5.
PAGE 10
MAX11041/MAX11042 Wired Remote Controllers S SDA 0 1 0 0 0 A1 A2 R/W 2 3 4 5 6 7 8 SCL 1 ACK 9 Figure 6. Slave Address and R/W Bit P S SDA SCL Figure 7. START and STOP Conditions S NOT ACKNOWLEDGE SDA ACKNOWLEDGE SCL 1 2 8 9 Figure 8. Acknowledge Bits 4) The MAX11041/MAX11042 send the latest keypress type (K7–K0) stored in the FIFO starting with the most-significant bit. Afterwards the master must send an ACK bit.
PAGE 11
Wired Remote Controllers MAX11041/MAX11042 Table 4.
PAGE 12
MAX11041/MAX11042 Wired Remote Controllers Table 5. Required Resistor Set for the MAX11042 KEY STANDARD 1% RESISTOR VALUE (Ω) FIFO RESISTOR CODE FUNCTION 0 0 0 Previous 1 7320 1 Next 2 15400 2 Play/pause 3 28700 3 Stop 4 54900 4 Volume up 5 133000 5 Volume down Jack inserted 130000 6 Jack inserted Jack removed ∞ 7 Jack removed Bit Transfer One data bit is transferred during each SCL clock cycle.
PAGE 13
Wired Remote Controllers ➀ ➁ ➂ Order of Keypress Detection Some applications require detection of the specific sequence of keys in software by looking for unique key presses within 32 ticks (1s). If the duration between keypresses exceeds the allowed time, assume the keypress is in error and return to the previous known state. ➃ JACK REMOVED JACK DETECTED FALSE KEYS Power-Up Jack Detect and Keypress Example TIME VINT TIME Figure 10 illustrates the FIFO entries during a typical sequence of events.
PAGE 14
MAX11041/MAX11042 Wired Remote Controllers VSENSE 1 2 4 3 5 6 7 8 9 10 12 11 TIME VINT t1 1 SHDN TRANSITION FROM LOW TO HIGH. READ POINTER READ POINTER 2 WRITE POINTER 0xFF 0xFF 0xFF 0xFF 0xFF 0xFF 0xFF 0xFF 5 t1/32ms t2/32ms t3/32ms WRITE POINTER TIMER... 0x00 0x00 0x00 0x00 KEY RELEASE DETECTED (JD CODE) AND ENTERED IN FIFO. FINAL DURATION TIME FROM 8 IS STORED. NEW DURATION TIME FOR JD CODE STARTS.
PAGE 15
Wired Remote Controllers VDD 8-WORD FIFO 8-BIT KEY A1 A0 8-BIT DURATION DURATION TIMER MAX11041 MAX11042 I2C INTERFACE SCL FORCE SDA CONTROL LOGIC DEBOUNCE KEY DETECTOR ±15kV ESD SENSE INT SHDN GND Pin Configurations (continued) BOTTOM VIEW D GND C SENSE FORCE VDD INT SDA MAX11041 MAX11042 B VDD A N.C. A1 A0 SHDN 1 2 3 4 SCL UCSP (2mm x 2mm x 0.
PAGE 16
Wired Remote Controllers MAX11041/MAX11042 Typical Operating Circuit RSW0 RSW1 RSW30 3.3V RJACK HOLD SWITCH DAC I2S VOLUME DAC MAX9850 VBUS 3.3V µP 0.
PAGE 17
Wired Remote Controllers 16L,UCSP.EPS PACKAGE OUTLINE, 4x4 UCSP 21-0101 H ___________________________________________________________________________________ 1 1 17 MAX11041/MAX11042 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 18
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 MAX11041/MAX11042 Wired Remote Controllers PACKAGE OUTLINE, 12, 16, 20, 24, 28L THIN QFN, 4x4x0.8mm 21-0139 E 1 2 PACKAGE OUTLINE, 12, 16, 20, 24, 28L THIN QFN, 4x4x0.