ADP5588 Keypad I/O Expander
Evaluation Board
EVAL-ADP5588
Rev. 0
Evaluation boards are only intended for device evaluation and not for production purposes.
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Evaluation boards are not authorized to be used in life support devices or systems.
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FEATURES
10 column × 8 rows port expander, maximum 10 × 8 keypad
matrix
Rows and columns configurable to keypad, GPI or GPO
Dual light sensor inputs
I
2
C interface
Auto increment capability
1.8 V and 3.0 V operation for I
2
C and GPIOs (1.7 V ~ 3.0 V)
Interrupt capability
ADP5588 evaluation software included
On-board reset
GPO indicator LEDs
GPIO jumper configuration
Switches to set GPI levels
GENERAL DESCRIPTION
The ADP5588 demonstration board is used to exercise the
features of the ADP5588 keypad/GPIO expander IC. It consists
of a daughterboard and a motherboard. The motherboard houses
the keypad (80 switches), a USB connector (JP1), a reset switch
(S17), and all the hardware necessary to power the IC and establish
USB communication with the PC. Two 20-pin connectors (J11
and J12) are used to plug in the daughterboard. The ADP5588
IC is mounted on the daughterboard along with the LK1 and LK2
jumpers, which are used to insert or remove the C19 and C20
capacitors from the light sensor comparator circuitry.
The demonstration board assembly is powered either via J10 or
the USB port and comes with a free graphical user interface (GUI)
to exercise the ADP5588 features. In addition to the keypad
switches, the motherboard also has 18 GPO LED indicators (D1
through D11, D22 through D27, and D30), power status LEDs
(D19 and D21), a 2.7 V regulator, a 3.3 V regulator, and jumpers
(J1 through J8 and J13 through J22) to configure the GPIOs as
GPIs, GPOs, or keypad lines. The motherboard is equipped with
jumpers (LK8 and LK10) to configure the board to use either
external regulated voltages via J10 or the on-board regulators when
plugged into the USB port. When using the USB port as the power
source, place jumpers across Pin 1 and Pin 2 of LK8 and LK10.
When using external voltages, place jumpers across Pin 2 and
Pin 3 of LK8 and LK10. V
CC
(Pin 3 of J10) should be 1.8 V to 3.0 V,
and V
BOARD
(Pin 1 of J10) should be 3.3 V.
A set of switches (SW1 through SW18) provides logic high
(Logic 1) or logic low (Logic 0) drives to the GPIOs configured
as GPIs. Column 8 and Column 9 of the IC have an additional
jumper (J9) that allows the user to configure theses lines into
light sensor comparator inputs. Place a jumper across Pin 1 and
Pin 3 of J9 and another across Pin 2 and Pin 4 of J9 to configure
these pins as Keypad Column 8 and Keypad Column 9, or place
a jumper across Pin 3 and Pin 5 of J9 and another across Pin 4
and Pin 6 of J9 to configure these pins as light sensor inputs.
MOTHERBOARD LAYOUT
0
81
02
-0
01
DAUGHTER
BOARD
CONNECTORS
KEYPAD SWITCHES
GPI SWITCHES
RESET SWITCH
USB CONNCTOR
GPIO JUMPER SETTINGS
GPO LEDs
ALS JUMPER
G
PI
O
J
U
M
PER SE
TTI
NG
S
GP
I S
W
IT
C
H
E
S
Figure 1.
