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SX1512BIULTRT Datasheet(PDF) 1 Page - Semtech Corporation

Part No. SX1512BIULTRT
Description  World’s Lowest Voltage Level Shifting GPIO with LED Driver and Keypad Engine
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Maker  SEMTECH [Semtech Corporation]
Homepage  http://www.semtech.com
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SX1512BIULTRT Datasheet(HTML) 1 Page - Semtech Corporation

 
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ADVANCED COMMUNICATIONS & SENSING
Rev 4 – 26
th April 2011
1
www.semtech.com
SX1511B/SX1512B
World’s Lowest Voltage Level Shifting GPIO
with LED Driver and Keypad Engine
SX1511B/SX1512B
World’s Lowest Voltage Level Shifting GPIO with LED Driver and Keypad Engine
GENERAL DESCRIPTION
The SX1511B and SX1512B are complete ultra low
voltage General Purpose parallel Input/Output (GPIO)
expanders ideal for low power handheld battery
powered equipment. This family of GPIOs comes in
8-, 16-channel configuration and allows easy serial
expansion of I/O through a standard SPI interface.
GPIO devices can provide additional control and
monitoring when the microcontroller or chipset has
insufficient I/O ports, or in systems where serial
communication and control from a remote location is
advantageous.
These devices can also act as a level shifter to
connect a microcontroller running at one voltage level
to a component running at a different voltage level,
thus eliminating the need for extra level translating
circuits. The core is operating as low as 1.425V while
the dual I/O banks can operate between 1.2V and
3.6V independent of the core voltage and each other
(5.5V tolerant).
The
SX1511B
and
SX1512B
feature
a
fully
programmable LED Driver with internal oscillator for
enhanced lighting control such as intensity (via 256-
step PWM), blinking and breathing (fade in/out) make
them highly versatile for a wide range of LED
applications.
In addition, keypad applications are also supported
with
an
on-chip
scanning
engine that enables
continuous keypad monitoring up to 64 keys without
any additional host interaction reducing the bus
activity.
The SX1511B and SX1512B have the ability to
generate mask-programmable interrupts based on a
falling/rising edge of any of its GPIO lines. A
dedicated pin (NINT) indicates to a host controller
that a state change occurred on one or more of the
lines. Each GPIO is programmable via a bank of 8-bit
configuration registers that include data, direction,
pull-up/pull-down,
interrupt
mask
and
interrupt
registers. These I/O expanders feature small footprint
packages and are rated from -40°C to +85°C
temperature range.
ORDERING INFORMATION
Part Number
I/Os
Package
Marking
SX1511BIULTRT
8
QFN-UT-20
JKA5
SX1512BIULTRT
16
QFN-UT-28
KA25
SX1512BEVK
16
Evaluation Kit
-
KEY PRODUCT FEATURES
1.2V to 3.6V Low Operating Voltage with Dual
Independent I/O Rails (VCC1, VCC2)
Enable Direct Level Shifting Between I/O
Banks and Host Controller
5.5V Tolerant I/Os, Up to 15mA Output Sink on
all I/Os (No Total Sink Current Limit)
Integrated LED Driver for Enhanced Lighting
Intensity Control (256-step PWM)
Blink Control (224 On/Off values)
Breathing Control (224 Fade In/Out values)
On-Chip Keypad Scanning Engine
Support Up to 8x8 Matrix (64 Keys)
Configurable Input Debouncer
8/16 Channels of True Bi-directional Style I/O
Programmable Pull-up/Pull-down
Push/Pull or Open-drain outputs
Programmable Polarity
Open Drain Active Low Interrupt Output (NINT)
Bit Maskable
Programmable Edge Sensitivity
Built-in Clock Management (Internal 2MHz
Oscillator/External Clock Input, 7 clock values)
OSCIO can be Configured as GPO
SPI Compatible Slave Interface (up to 20MHz)
Power-On Reset and Reset Input (NRESET)
Ultra Low Current Consumption: 1uA Typ
-40°C to +85°C Operating Temperature Range
Up to 2kV HBM ESD Protection
Small Footprint Packages
Pb & Halogen Free, RoHS/WEEE compliant
TYPICAL APPLICATIONS
Cell phones, PDAs, MP3 players
Digital camera, Notebooks, GPS Units
Any battery powered equipment
SPI
NRESET
NINT
VDDM
1.425 - 3.6V
VCC1
1.2 - 3.6V
VCC2
1.2 - 3.6V
SX1511B
FULL LED DRIVE
KEYPAD SCANNING
BUTTON CONTROL
Host
Controller
IO0
IO1
IO2
IO3
IO4
IO5
IO6
IO7
LEVEL SHIFTING


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