ADP5587_1 AD [Analog Devices], ADP5587_1 Datasheet - Page 21

• Manufacturer Part Number: ADP5587_1
• Description: Mobile I/O Expander and QWERTY Keypad Controller
• Manufacturer: AD [Analog Devices]

APPLICATIONS INFORMATION
APPLICATIONS OVERVIEW
The ADP5587 is designed to complement host processors in
a variety of ways. Its versatility makes it the ideal solution for
mobile platforms that require extended keypads and GPIO
expanders. The programmable registers give the designer the
flexibility to configure any or all of its GPIOs in a variety of
ways. Figure 19 shows a detailed application diagram.
PROCESSOR
HOST
V
CC
SCL
SDA
RST
INT
PWM OUTPUT
V
CC
V
GPI1
GND
SDA
RST
SCL
V
CC
INT
CC
GPI2
19
21
23
22
20
24
A7
B7
C7
D7
E7
G7
H7
F7
J7
I7
1
A6
B6
C6
D6
E6
F6
G6
H6
J6
I6
2
Figure 19. ADP5587 Detailed Application Block Diagram
A5
B5
C5
D5
G5
H5
E5
F5
J5
I5
3
REGISTERS
CONTROL
A4
B4
C4
D4
E4
G4
H4
F4
J4
I4
4
A3
B3
C3
D3
E3
F3
G3
H3
J3
I3
5
G2
A2
B2
C2
D2
E2
F2
H2
J2
I2
6
A1
B1
C1
D1
G1
H1
Rev. B | Page 21 of 24
E1
F1
J1
I1
7
G0
A0
B0
C0
D0
E0
F0
H0
J0
I0
8
9
10
INTERFACE
CONTROL
KEYPAD CURRENT
Keypad current drain varies based on how many keys and how
many rows and columns are pressed during multiple key
presses. Table 34 shows the typical current drain for a single key
press and for two key presses.
Table 34. Typical Current Drain
Number of Key Presses
1
2
1
11
T
A
= T
12
J
= −40°C to +85°C.
13
14
ADP5587
15
16
18
17
ENABLE 2 (GPO)
ENABLE (GPO)
C9
C8
BACKLIGHT
Conditions
V
V
CC
CC
= 1.8 V to 3.0 V
= 1.8 V to 3.0 V
1
BACKLIGHT
DRIVER
Typical
55
100
ADP5587
Unit
μA
μA