Data Sheet ADP5587
Rev. D | Page 21 of 24
APPLICATIONS INFORMATION
CONTROL
REGISTERS
HOST
PROCESSOR
CONTROL
INTERFACE
R7
R6
R5
R4
R3
R2
R1
R0
C0
C1
C2
C3
C4
C5
C6
C7
C9
C8
ENABLE 2 (GPO)
BACKLIGHT
ENABLE (GPO)
A0A1A2A3A4A5A6A7
B0B1B2B3B4B5B6B7
C0C1C2C3C4C5C6C7
D0D1D2D3D4D5D6D7
E0E1E2E3E4E5E6E7
F0F1F2F3F4F5F6F7
G0G1G2G3G4G5G6G7
H0H1H2H3H4H5H6H7
I0I1I2I3I4I5I6I7
J0J1J2J3J4J5J6J7
SCL
SDA
V
CC
GND
V
CC
SCL
GPI1
GPI2
SDA
RST
INT
19
21
23
22
18
17
20
24
1 2
3 4 5 6 7 8 9 10 11 12 13 14 15 16
V
CC
BACKLIGHT
DRIVER
PWM OUTPUT
ADP5587
V
CC
RST
INT
08612-015
Figure 19. ADP5587 Detailed Application Block Diagram
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.
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 Conditions
1
Typical Unit
1 V
CC
= 1.8 V to 3.0 V 55 μA
2 V
CC
= 1.8 V to 3.0 V 100 μA
1
T
A
= T
J
= −40°C to +85°C.
