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PDF STMPE811 Data sheet ( Hoja de datos )
| Número de pieza | STMPE811 | |
| Descripción | 8-bit port expander | |
| Fabricantes | STMicroelectronics | |
| Logotipo |  |
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STMPE811
8-bit port expander with advanced touchscreen controller
Preliminary Data
Features
■ 8 GPIOs
www.DataSheet4U■.com1.8 - 3.3 V operating voltage
■ Integrated 4-wire touchscreen controller
■ Interrupt output pin
■ Wakeup feature on each I/O
■ SPI and I2C interface
■ Up to 2 devices sharing the same bus in I2C
mode (1 address line)
■ 8-input 12-bit ADC
■ 128-depth buffer touchscreen controller
■ Touchscreen movement detection algorithm
■ 25 kV air-gap ESD protection (system level)
■ 4 kV HBM ESD protection (device level)
Applications
■ Portable media players
■ Game consoles
■ Mobile and smart phones
QFN16
Description
The STMPE811 is a GPIO (general purpose
input/output) port expander able to interface a
main digital ASIC via the two-line bidirectional bus
(I2C). A separate GPIO expander is often used in
mobile multimedia platforms to solve the
problems of the limited amount of GPIOs typically
available on the digital engine.
The STMPE811 offers great flexibility, as each I/O
can be configured as input, output or specific
functions. The device has been designed with
very low quiescent current and includes a wakeup
feature for each I/O, to optimize the power
consumption of the device.
A 4-wire touchscreen controller is built into the
STMPE811. The touchscreen controller is
enhanced with a movement tracking algorithm to
avoid excessive data, 128 x 32 bit buffer and a
programmable active window feature.
Table 1. Device summary
Order code
STMPE811QTR
Package
QFN16
Packaging
Tape and reel
June 2008
Rev 1
This is preliminary information on a new product now in development or undergoing evaluation. Details are subject to
change without notice.
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1 page  
STMPE811
Pin configuration and functions
2 Pin configuration and functions
Figure 2. STMPE811 pin configuration (top through view)
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12 11 10 9
13 8
14 7
STMPE811
15 6
16 5
1234
Table 2.
Pin
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
Pin assignments
Name
Function
Y-
INT
A0/Data Out
SCLK
SDAT
VCC
Data in
IN0
Y-/GPIO-7
Interrupt output
I2C address in Reset, Data out in SPI mode
I2C/SPI clock
I2C data/SPI CS
1.8 −3.3 V supply voltage
SPI Data In
IN0/GPIO-0
IN1
GND
IN2
IN1/GPIO-1/MODE
In RESET state, MODE selects the type of serial interface
"0" - I2C
"1" - SPI
Ground
IN2/GPIO-2
IN3 IN3/GPIO-3
X+ X+/GPIO-4
Vio Supply for touchscreen driver and GPIO
Y+ Y+/GPIO-5
X- X-/GPIO-6
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STMPE811
I2C interface
4.3
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Read operation
A write is first performed to load the register address into the Address Counter but without
sending a Stop condition. Then, the bus master sends a reStart condition and repeats the
Device Address with the R/W bit set to 1. The slave device acknowledges and outputs the
content of the addressed byte. If no additional data is to be read, the bus master must not
acknowledge the byte and terminates the transfer with a Stop condition.
If the bus master acknowledges the data byte, then it can continue to perform the data
reading. To terminate the stream of data bytes, the bus master must not acknowledge the
last output byte, and be followed by a Stop condition. If the address of the register written
into the Address Counter falls within the range of addresses that has the auto-increment
function, the data being read will be coming from consecutive addresses, which the internal
Address Counter automatically increments after each byte output. After the last memory
address, the Address Counter 'rolls-over' and the device continues to output data from the
memory address of 0x00. Similarly, for the register address that falls within a non-increment
range of addresses, the output data byte comes from the same address (which is the
address referred by the Address Counter).
Acknowledgement in read operation
For the above read command, the slave device waits, after each byte read, for an
acknowledgement during the ninth bit time. If the bus master does not drive the SDA to a
low state, then the slave device terminates and switches back to its idle mode, waiting for
the next command.
4.4 Write operations
A write is first performed to load the register address into the Address Counter without
sending a Stop condition. After the bus master receives an acknowledgement from the slave
device, it may start to send a data byte to the register (referred by the Address Counter).
The slave device again acknowledges and the bus master terminates the transfer with a
Stop condition.
If the bus master needs to write more data, it can continue the write operation without
issuing the Stop condition. Whether the Address Counter autoincrements or not after each
data byte write depends on the address of the register written into the Address Counter.
After the bus master writes the last data byte and the slave device acknowledges the receipt
of the last data, the bus master may terminate the write operation by sending a Stop
condition. When the Address Counter reaches the last memory address, it 'rolls-over' to the
next data byte write.
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| Páginas | Total 30 Páginas | |
| PDF Descargar | [ Datasheet STMPE811.PDF ] | |
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