STMPE801
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STMPE2401
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Electronic devices while moving towards
smaller more portable packaging, are
featuring greater functions. This translates
into a more advanced technology requirement
with more computational power and memory
in the already size-constrained silicon
space of microcontrollers or microprocessors.
To address this issue, ST has introduced
the new Xpander Logic family to help
overcome the limited number of Input/Output
(I/O) ports in the microcontroller and
microprocessor based embedded systems.
Any existing or additional intensive
tasks on the central processing unit
(CPU) can be reassigned to the Xpander
Logic IC at ultra-low power consumption
and in very small packages. |
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General Purpse Input/Output
Port Expansion |
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The functions of a GPIO port expander can be
obtained by upgrading the CPU with integrated
features or by adding a Complex Programmable
Logic Device (CPLD)/Field Programmable gate
Array (FPGA). However both solutions come with
their respective pros and cons:
|
|
Xpander
Logic |
CPU
Upgrade |
CPLD
Addition |
| Cost |
Low |
Medium |
High |
| Solution
size |
Medium |
Small |
Large |
| Power
consumption |
Low |
Medium |
Medium |
| Flexibility |
Less
Flexible |
Highly
flexible |
Flexible |
| PCB
routing |
Good |
Potentially
problematic |
Good |
Xpander Logic allows the existing system processor
to use a wide range of intelligent functions
through a standard and high-speed Inter-Integrated
Circuit (I2C) serial peripheral interface. All
these features are achieved through a minimum
change on the existing microprocessor or microcontroller’s
firmware. This results in a very flexible, cost-competitive
solution to expand the system’s resources
compared to the complex implementation of a
larger and more expensive CPU or CPLD in the
embedded system. A further benefit of the Xpander
Logic family is the high optimization for micro-power
operation and the advanced power management
support that helps modern portable systems preserve
and extend battery life.
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Xpander Logic Key Features |
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Very small packages: QFN16 and µTFBGA36
Ultra low power consumption
Flexible voltage interface
Intelligent features: Keypad controller, PWM
controller, Rotator controller, ADC/DAC and
automatic dimming
8, 16 and 24 I/Os
Open drain interrupt output pin
I2C standard/fast speed
Reset pin
| Part
Number
|
GPIO |
Package |
Intelligent
features |
|
8 |
QFN16 |
Basic |
|
24 |
µTFBGA36 |
Yes |
QWERTY keypads
Mobile phones, smart phones, IP phones
Multifunction printers
Portable multimedia devices
Industrial automation
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