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PDF ADP5588 Data sheet ( Hoja de datos )
| Número de pieza | ADP5588 | |
| Descripción | Keypad I/O Expander | |
| Fabricantes | Analog Devices | |
| Logotipo |  |
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FEATURES
18-GPIO port expander or 10 × 8 keypad matrix
GPIOs configurable to GPIs, GPOs, and keypad rows or
columns
Dual light sensor inputs (C8 and C9)
I2C interface
I2C register read autoincrement
1.8 V to 3.0 V operation
Keypad lock capability
Open-drain interrupt output
Key press and key release interrupts
GPI interrupt with level programmability
Programmable pull-ups
Key event counter with overflow interrupt
50 μs debounce on the reset line and GPIs
1 μA typical idle current, 55 μA typical polling current drain
for one key press
Small 4 mm × 4 mm LFCSP package
APPLICATIONS
Keypad and I/O expander designed for QWERTY type phones
that require a large keypad matrix
GENERAL DESCRIPTION
The ADP5588 is an I/O port expander and keypad matrix
designed for QWERTY type phones that require a large keypad
matrix and expanded I/O lines. I/O expander ICs are used in
mobile platforms as a solution to the limited number of GPIOs
available in the main processor.
In its small 4 mm × 4 mm package, the ADP5588 contains
enough power to handle all key scanning and decoding and flag
the processor of key presses and releases via the I2C® interface
and interrupt. It frees the main microprocessor from having to
monitor the keypad, thereby minimizing current drain and
increasing processor bandwidth. It is also equipped with a
buffer/FIFO and key event counter to handle and keep track of
up to 10 unprocessed key or GPI events with overflow wrap and
interrupt capability.
The ADP5588 has a keylock capability with an option to trigger
or not trigger an interrupt at key presses and releases. All com-
munication to the main processor is done using one interrupt line
and two I2C-compatible interface lines. The ADP5588 can be
configured to have a keypad matrix of up to 8 rows × 10 columns
(a maximum of 80 keys).
Keypad I/O Expander
ADP5588
FUNCTIONAL BLOCK DIAGRAM
REF
VOLTAGE
ADP5588
GND 19
VCC 21
SCL 23
SDA 22
RST 20
CONTROL
REGISTERS
CONTROL
INTERFACE
REF
VOLTAGE
INT 24
C9
C8
C9
C8
C9
18
C8
17
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16
Figure 1.
When used for smaller keypad matrices, unused row and
column pins can be reconfigured to act as general-purpose
inputs, outputs, or light sensor inputs. R0, R1, R2, R3, R4, R5,
R6, and R7 denote the row pins of the matrix, while C0, C1, C2,
C3, C4, C5, C6, C7, C8, and C9 denote the column pins. At
power-up, all rows and columns default as GPIs and must be
programmed to function as part of the keypad matrix, GPOs, or
light sensor inputs. In addition to keypad and GPIO functionalities,
C8 and C9 can also be configured as light sensor inputs.
When configured as keypad lines, the function of the C8 and
C9 lines is straightforward: the control interface disconnects
these lines from the comparator inputs, disables the light sensor
comparator, and connects them to the keypad columns of the
keypad matrix. When used as light sensor comparator inputs,
the control interface disconnects these pins from the keypad,
enables the comparators, and connects these lines to the com-
parator inputs. Two external capacitors (0.1 μF) are required
when these pins are configured as light sensor inputs. When
used as GPIOs, these pins are removed from the keypad and the
light sensor interface, and the light sensor comparators are
disabled, along with the logic for the sensors.
Rev. A
Information furnished by Analog Devices is believed to be accurate and reliable. However, no
responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other
rights of third parties that may result from its use. Specifications subject to change without notice. No
license is granted by implication or otherwise under any patent or patent rights of Analog Devices.
Trademarksandregisteredtrademarksarethepropertyoftheirrespectiveowners.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700
www.analog.com
Fax: 781.461.3113
©2008 Analog Devices, Inc. All rights reserved.
1 page  
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ABSOLUTE MAXIMUM RATINGS
Table 7.
Parameter
VCC
R0 to R7, C0 to C9
SCL
SDA
RST
INT
GND
Operating Ambient Temperature Range
Operating Junction Temperature Range
Storage Temperature Range
ESD Machine Model
ESD Human Body Model
ESD Charged Device Model
Soldering Condition
Rating
−3 V to +4.0 V
−3 V to VCC + 0.3 V
−3 V to VCC+ 0.3 V
−3 V to VCC + 0.3 V
−3 V to VCC + 0.3 V
−3 V to VCC + 0.3 V
−0.3 V to +0.3 V
−40°C to +85°C
−40°C to +125°C
−65°C to +150°C
±200 V
±2000 V
±1000 V
JEDEC J-STD-020
Stresses above those listed under Absolute Maximum Ratings
may cause permanent damage to the device. This is a stress
rating only; functional operation of the device at these or any
other conditions above those indicated in the operational
section of this specification is not implied. Exposure to absolute
maximum rating conditions for extended periods may affect
device reliability.
ADP5588
THERMAL RESISTANCE
θJA is specified for the worst-case conditions, that is, a device
soldered in a circuit board for surface-mount packages.
Table 8. Thermal Resistance
Package Type
24-Lead LFCSP_VQ
Maximum Power
θJA
57.8
600
θJC Unit
9.4 °C/W
mW
ESD CAUTION
Rev. A | Page 5 of 28
5 Page 
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START
ADP5588
NO MASK TIMER = 0 YES
NO KEY PRESS YES
DETECTED
GENERATE
KE INTERRUPT
START MASK TIMER
YES
MASK TIMER
EXPIRES
NO
NO FIRST UNLOCK
KEY DETECTED
YES
START UNLOCK1 TO UNLOCK2
YES
UNLOCK1 TO
UNLOCK2
TIMER EXPIRES
NO
YES
MASK TIMER
EXPIRES
NO
KEY PRESS
DETECTED
YES
NO
FIRST UNLOCK NO
KEY DETECTED
YES
START UNLOCK1 TO UNLOCK2
UNLOCK1 TO
UNLOCK2
TIMER EXPIRES
NO
YES
SECOND UNLOCK NO
KEY DETECTED
YES
GENERATE
KEYLOCK INTERRUPT
NO SECOND UNLOCK
KEY DETECTED
YES
GENERATE
KEYLOCK INTERRUPT
Figure 10. Keypad Lock Interrupt Mask Timer Flowchart
Debouncing
The ADP5588 has a 50 μs debounce time for GPIOs configured
as GPIs and rows in keypad scanning mode. The reset line
always has a 50 μs debounce time.
General Purpose Outputs (GPOs)
The ADP5588 allows the user to configure all or some of its
GPIOs as GPOs. These GPOs can be used as extra enables for
the host processor or simply as trigger outputs. When configured
as an output (GPO), a digital buffer drives the pin to 0 V for a 0
and to VCC for a 1. To set any GPIO as a GPO, make sure that
the corresponding bits in Register 0x1D through Register 0x1F are
set for GPIO mode; then use Register 0x23 through Register 0x25
to set the corresponding bits for GPO mode.
Power-On Reset
For built-in power-up initialization for applications lacking a
power-on reset signal, a reset pin, RST, allows the user to reset
the registers to default values in the event of a brownout or
other reset conditions.
Ambient Light Sensing
The ADP5588 has built in light sensor comparator inputs to
detect ambient light conditions. An ADC samples the output of
external photosensors connected to the comparator inputs, and
the result is fed into programmable trip comparators. The ADC
has an input range of 0 μA to 1000 μA (typical). The device can
handle up to two photosensors (use Register 0x30 through
Register 0x3A to configure the photosensor inputs).
Rev. A | Page 11 of 28
11 Page | ||
| Páginas | Total 28 Páginas | |
| PDF Descargar | [ Datasheet ADP5588.PDF ] | |
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