Product details

Number of I/Os 4 Features (x1) PWM, 72-input keypad scan, Reset pin Supply voltage (Min) (V) 2.25 Supply voltage (Max) (V) 2.9 Addresses 1 Rating Catalog Frequency (Max) (kHz) 400 Operating temperature range (C) -40 to 85
Number of I/Os 4 Features (x1) PWM, 72-input keypad scan, Reset pin Supply voltage (Min) (V) 2.25 Supply voltage (Max) (V) 2.9 Addresses 1 Rating Catalog Frequency (Max) (kHz) 400 Operating temperature range (C) -40 to 85
WQFN (NJE) 32 36 mm² 6 x 6 csBGA (NYC) 49 16 mm² 4 x 4
  • 8 × 8 Standard Keys
  • 8 Special Function Keys (SF Keys) Providing a Total of 72 Keys for the Maximum Keyboard Matrix
  • ACCESS.Bus (I2C-compatible) Communication Interface to the Host
  • Four General Purpose Host Programmable I/O Pins with Two Optional (Slow) External Interrupts
  • 15-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

All trademarks are the property of their respective owners.

  • 8 × 8 Standard Keys
  • 8 Special Function Keys (SF Keys) Providing a Total of 72 Keys for the Maximum Keyboard Matrix
  • ACCESS.Bus (I2C-compatible) Communication Interface to the Host
  • Four General Purpose Host Programmable I/O Pins with Two Optional (Slow) External Interrupts
  • 15-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

All trademarks are the property of their respective owners.

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 WQFN and a
49-pin csBGA. Both are chip-scale packages.

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 WQFN and a
49-pin csBGA. Both are chip-scale packages.

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Technical documentation

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Type Title Date
* Data sheet Mobile I/O Companion Sup Key-Scan, I/O Expansion, PWM & ACCESS.bus Host I/F datasheet (Rev. K) 03 May 2013
Application note Understanding the I2C Bus 30 Jun 2015
Application note Maximum Clock Frequency of I2C Bus Using Repeaters 15 May 2015
Application note I2C Bus Pull-Up Resistor Calculation 13 Feb 2015

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WQFN (NJE) 32 View options
csBGA (NYC) 49 View options

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