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ADP5588 の電気的特性と機能

ADP5588のメーカーはAnalog Devicesです、この部品の機能は「Keypad I/O Expander」です。


製品の詳細 ( Datasheet PDF )

部品番号 ADP5588
部品説明 Keypad I/O Expander
メーカ Analog Devices
ロゴ Analog Devices ロゴ 




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ADP5588 Datasheet, ADP5588 PDF,ピン配置, 機能
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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





ADP5588 pdf, ピン配列
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ADP5588
SPECIFICATIONS
TA = TJ = −40°C to +85°C, unless otherwise noted.
DC ELECTRICAL CHARACTERISTICS
Table 1. General DC Electrical Characteristics
Parameter
Symbol
SUPPLY VOLTAGE
VCC Input Voltage Range
Photosensor Voltage
Supply Current1
With One Key Press
With One Key Press
With GPI Low (Pull-Up Enabled)2
With GPI Low (Pull-Up Disabled)
With One GPO Active3
VCC
VPHOTOSENSOR
ICC
ICC
ICC
ICC
ICC
ICC
AMBIENT LIGHT SENSOR (CMP_IN1, CMP_IN2)
Maximum Sensor Range
Sensor Supply Current (One Comparator
Enabled, 0 Minimum Input Current)4
ISENSOR
ICC
Sensor Current (One Comparator Enabled,
Maximum Input Current)4
ICC
Sensor Current (Both Comparators Enabled, ICC
Minimum Input Current)4
Sensor Current (Both Comparators Enabled, ICC
Maximum Input Current)4
OSCILLATOR CURRENT
Oscillator Current (Enabled)
ICC
Conditions
Min Typ Max
Unit
1.7 3.0 V
VCC + 0.2
VCC = 1.8 V to 3.0 V, TA = −40°C to +85°C
1 10
μA
VCC = 1.8 V, TA = −40°C to +85°C
55 90
μA
VCC = 3.0 V, TA = −40°C to +85°C
100 200
μA
VCC = 1.8 V to 3.0 V, TA = −40°C to +85°C
20 50
μA
VCC = 1.8 V to 3.0 V, TA = −40°C to +85°C
2 10
μA
VCC = 1.8 V, TA = −40°C to +85°C
50 μA
VCC = 1.8 V to 3.0 V, TA = 25°C
VCC = 1.8 V to 3.0 V
VCC = 1.8 V to 3.0 V
VCC = 1.8 V to 3.0 V
VCC = 1.8 V to 3.0 V
0.85 1.0 1.15
100 150
160 200
130 180
240 400
mA
μA
μA
μA
μA
VCC = 1.8 V to 3.0 V
40 μA
1 Operating current measured with I/Os defaulting as GPIs with all pull-ups enabled and all inputs open.
2 With one GPI low.
3 Load = 100 k.Ω
4 Photosensor maximum voltage = VCC + 0.2.
Table 2. I/O DC Electrical Characteristics
Parameter
Symbol
Conditions
INPUT LOGIC LEVELS (SCL, SDA, RST, C0 to C9, R0 to R7)1
Logic Low Input Voltage
Logic High Input Voltage
Schmitt Trigger Hysteresis
Input Leakage Current
VIL
VIH
VHYST
VI-LEAKAGE
1.7 V ≤ VIO ≤ 3.0 V
1.7 V ≤ VIO ≤ 3.0 V
1.7 V ≤ VIO ≤ 3.0 V
OUTPUT LOGIC LEVELS (C0 to C9, R0 to R7)
Logic Low Output Voltage
Output High Voltage
VOL ISINK = 1 mA
VOH ISOURCE = 1 mA
OUTPUT LOGIC LEVELS (INT, SDA)
Output Low Voltage
Output High Voltage
Logic High Leakage Current
PULL-UP RESISTANCE FOR GPIOs (C0 to C9, R0 to R7)2
VOL
VOH
VO-LEAKAGE
RPULL-UP
ISINK = 3 mA
1.7 V ≤ VCC ≤ 3.0 V
1.7 V ≤ VCC ≤ 3.0 V
1.7 V ≤ VCC ≤ 3.0 V
Min
0.65 x VCC
−1
Typ Max Unit
0.2 x VCC V
V
0.10 V
1 μA
0.40
VCC − 0.3 V
V
V
0.40
0.95 × VCC
0.1
100
1
V
V
μA
1 Power-up default current. All I/Os default as GPIs and are open; C8 and C9 default as GPIs; I2C is idle.
2 GPIO internal pull-ups are designed to 100 kΩ.
Rev. A | Page 3 of 28


3Pages


ADP5588 電子部品, 半導体
ADP5588www.DataSheet4U.com
PIN CONFIGURATION AND FUNCTION DESCRIPTIONS
R7 1
R6 2
R5 3
R4 4
R3 5
R2 6
PIN 1
INDICATOR
ADP5588
TOP VIEW
(Not to Scale)
18 CMP_IN2/C9
17 CMP_IN1/C8
16 C7
15 C6
14 C5
13 C4
NOTES
1. NC = NO CONNECT.
2. EXPOSED PAD MUST BE CONNECTED TO GROUND.
Figure 3. Pin Configuration
Table 9. Pin Function Descriptions
Pin No. Mnemonic Description
1 R7
GPIO, Row 7 in the Keypad Matrix.
2 R6
GPIO, Row 6 in the Keypad Matrix.
3 R5
GPIO, Row 5 in the Keypad Matrix.
4 R4
GPIO, Row 4 in the Keypad Matrix.
5 R3
GPIO, Row 3 in the Keypad Matrix.
6 R2
GPIO, Row 2 in the Keypad Matrix.
7 R1
GPIO, Row 1 in the Keypad Matrix.
8 R0
GPIO, Row 0 in the Keypad Matrix.
9 C0
GPIO, Column 0 in the Keypad Matrix.
10 C1
GPIO, Column 1 in the Keypad Matrix.
11 C2
GPIO, Column 2 in the Keypad Matrix.
12 C3
GPIO, Column 3 in the Keypad Matrix.
13 C4
GPIO, Column 4 in the Keypad Matrix.
14 C5
GPIO, Column 5 in the Keypad Matrix.
15 C6
GPIO, Column 6 in the Keypad Matrix.
16 C7
GPIO, Column 7 in the Keypad Matrix.
17 CMP_IN1/C8 GPIO, Column 8 in the Keypad Matrix; Comparator Input for Photosensor 1.
18 CMP_IN2/C9 GPIO, Column 9 in the Keypad Matrix; Comparator Input for Photosensor 2.
19 GND Ground.
20 RST
Hardware Reset (Active Low). This bit resets the device to the power default conditions. The reset pin must be
driven for a minimum of 50 μs to be valid and to prevent falsing due to ESD glitches or noise in the system. If
not used, RST must be tied high with a pull-up.
21 VCC
VCC = 1.7 V to 3.3 V.
22 SDA I2C Serial Data (Open Drain Requires External Pull-up).
23 SCL
I2C Clock.
24 INT
Processor Interrupt, Active Low, Open Drain. This pin can be pulled up to 2.7 V or 1.8 V for selection flexibility in
the processor GPIO supply group.
EP
EPAD
Exposed Pad. The exposed pad must be connected to ground.
Rev. A | Page 6 of 28

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