LM8333 - Mobile I/O Companion Supporting Key-Scan, I/O Expansion, PWM, and ACCESS.bus Host Interface

Datasheet Packaging Samples & Pricing Reliability Design Tools Knowledge Base

Features
• 8 × 8 standard keys
• 8 special function keys (SF keys) providing a total of 72 keys for the maximum keyboard matrix
• ACCESS.bus (I 2C-compatible) communication interface to the host
• Four general purpose host programmable I/O pins with two optional (slow) external Interrupts
• 16 byte FIFO buffer to store key pressed and key released events
• Error control with error reports on (FIFO overrun, Keypad overrun, invalid command)
• Host programmable PWM
• Host programmable active time and debounce time

General Description

The LM8333 Mobile I/O Companion offloads the burden of keyboard scanning from the host, while providing extremely low power consumption in both operational and standby modes. More...


Applications

• Mobile phones
• Personal Digital Assistants (PDAs)
• Smart handheld devices
• Personal media players
  Typical Application
*click for larger image


Parametric Table     expand
Parametric Table    collapse
Max Keypad 72
Special Function Keys 8
Key Debounce Yes
GPIOs 4
External Interrupts 2
Input Min Voltage 2.25 Volt
Input Max Voltage 2.75 Volt
Max Keypad 72
Special Function Keys 8
Key Debounce Yes
GPIOs 4
External Interrupts 2
Host Interface Type Access Bus/I2C
Host Interface Bus Speed 400000 Hz
Special Features PWM outputs are multiplexed
Access BUS/I2C Address 1
Watchdog Yes
FIFO Buffer 16 Bytes
PWM Outputs 1
Wakeup Yes
On-Chip Oscillator Yes
External Clock Input No
On-Chip Power-on-Reset Yes
RegType Mobile IO Companion
Temperature Min -40 deg C
Temperature Max 85 deg C
View Using Catalog

  Also Recommended
LM83221.8 V Operation, Up To 104 Keys, Up To 16 GPIO, 3 PWM

Additional Resources

Design Tools (see below)


Block Diagram

*click for larger image



Datasheet
RoHS Compliance Information Size in KbytesDate Click link below to Download
LM8333 Mobile I/O Companion Supporting Key-Scan, I/O Expansion, PWM, and ACCESS.bus Host Interface 626 Kbytes 21-Aug-07 Download

If you have trouble printing or viewing PDF file(s), see Printing Problems.


Package Availability, Models, Samples & Pricing
Part NumberPackageFactory Lead TimeModelsSamples &
Electronic
Orders		Budgetary PricingStd
Pack
Size		Package
Marking
Format
TypePinsSpec.MSL
Rating		Peak
Reflow		RoHS
Report		CAD
Symbols		WeeksQtyQty$US each
LM8333GGR8MICRO-ARRAY49NOPB1260RoHS N/A Full productionN/A
Samples
Buy Now 		1K+$1.95reel
of
1000		NS
UZXYTT
LM8333
16 weeksN/A
LM8333GGR8XMICRO-ARRAY49NOPB1260RoHS N/A Full productionN/A
 
Buy Now 		1K+$1.95reel
of
3500		NS
UZXYTT
LM8333
14 weeksN/A
LM8333FLQ8YLLP32NOPB3260RoHS N/A Full productionN/A
Samples
Buy Now 		1K+$1.95reel
of
250		NS
UZXYTT
LM8333F
8 weeksN/A
LM8333FLQ8XLLP32NOPB3260RoHS N/A Full productionN/A
Samples
Buy Now 		1K+$1.95reel
of
2500		NS
UZXYTT
LM8333F
16 weeksN/A

General Description

The LM8333 Mobile I/O Companion offloads the burden of keyboard scanning from the host, while providing extremely low power consumption in both operational and standby modes. It supports keypad matrices up to 8 × 8 in size (plus another 8 special-function keys), for portable applications such as cellphones, PDAs, games, and other handheld applications.

Key press and release events are encoded into a byte format and loaded into a FIFO buffer for retrieval by the host processor. An interrupt output (IRQ) is used to signal events such as keypad activity, a state change on either of two interrupt-capable general-purpose I/O pins, or an error condition. Interrupt and error codes are available to the host by reading dedicated registers.

Four general-purpose I/O pins are available, two of which have interrupt capability. A pulse-width modulated output based on a host-programmable internal timer is also available, which can be used as a general-purpose output if the PWM function is not required.

To minimize power, the LM8333 automatically enters a low-power standby mode when there is no keypad, I/O, or host activity.

The device is packaged in a 32–pin Leadless Leadframe package (LLP) and a 49-pin MICRO-ARRAY . Both are chip-scale packages.

Reliability Metrics

Part Number Process EFR Reject EFR Sample Size PPM LTA Rejects LTA Device Hours FITS MTTF (Hours)
LM8333FLQ8XCMOS8T0163950017800002505079860
LM8333FLQ8YCMOS8T0163950017800002505079860
LM8333GGR8CMOS8T0163950017800002505079860
LM8333GGR8XCMOS8T0163950017800002505079860

Note: The Early Failure Rates (EFR) were calculated as point estimate PPM based on rejects and sample size for EFR. The Long Term Failure Rates were calculated at 60% confidence using the Arrhenius equation at 0.7eV activation energy and derating the assumed stress temperature of 150°C to an application temperature of 55°C.

For more information on Reliability Metrics, please click here.


Design Tools

TitleSize in Kbytes Date Click link below to Download    
Evaluation Kit for LM8333 Device     View    

If you have trouble printing or viewing PDF file(s), see Printing Problems.

[Information as of 4-Jul-2009]