Mobile I/O Companions
Overview
Mobile I/O Companion devices are peripherals developed to expand host processor functionality while reducing system power consumption
- Programmable functions offered:
- General Purpose I/Os
- Keyboard Scanning and Event storage
- Complex sequence of PWM duty cycle generation
- Use extremely low power in operational and standby modes
- Communicate to host via I2C compatible ACCESS.bus interface
- Offered in ultra low profile micro-Array and LLP packages
Key Benefits
- Saving host valuable processing power by offloading keyscan and PWM programming functions
- Enabling Host to enter low power stand by mode, while Mobile I/O intercepts external events
- Expanding Host processor functionality with additional General Purpose I/Os, Complex PWMs, Key-scan
- Enabling modular System design since Mobile I/O Companion routines and circuitry layout can be reused
- Increasing application board layout flexibility by enabling more options for placement of a host device
- The host processor requires significantly less pins. It can refer to standard functions via only two/three connections (pins)
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 |
 |
 |
 |
 |
 |
 |
 |
 |
 |
 |
 |
 |
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2.25 V - 2.75 V |
72 |
8 |
4 |
400 kHZ |
1 |
16 Bytes |
1* |
Y |
Y |
N |
49 Micro-Array,
4 mm x 4 mm x 1 mm |
LM8333EVALKIT |
|
2.25 V - 2.75 V |
72 |
8 |
4 |
400 kHZ |
1 |
16 Bytes |
1* |
Y |
Y |
N |
32 LLP,
6 mm x 6 mm x 0.8 mm |
LM8333EVALKIT |
|
1.62 V - 1.98 V |
104 |
8 |
16* |
400 kHZ |
4 |
16 Bytes |
3* |
Y |
Y |
Y |
36 Micro-Array,
3.5 mm x 3.5 mm x 1 mm |
LM8322EVALKIT |
* Multiplexed
Key Features
- Support keypad matrices of up to 8 x 12 keys plus eight special-function (SF) keys for a total of 104 keys
- Support I2C-compatible ACCESS.bus interface in slave mode at 400 kHz (Fast-mode)
- Up to Three host-programmable PWM outputs for brightness control in backlight
- Support general-purpose I/O expansion
- Key-scan event storage in a FIFO buffer for up to 15 events
- Key events, errors, and dedicated hardware interrupts request host service by asserting the IRQ output
- Wake-up from Halt mode on any matrix key-scan event, any use of the SF keys, or any activity on the ACCESS.bus interface
Applications
- Mobile phones
- Personal Digital Assistants (PDAs)
- Smart handheld devices
- Personal media players
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Evaluation Kits
- Include HW and SW for quickly evaluating Mobile I/O Devices
- Software for the Host PC provides a graphical user interface for exercising all functions
- Evaluation board with USB interface to a host PC
- Ordering Part Number (NSID):
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LM8322 Three PWM Duty Cycle Outputs |
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