Analog Devices ADP5520, Manual

Page: 3 / 24

EVAL-ADP5520
Rev. 0 | Page 3 of 24
EVALUATION BOARD OVERVIEW
R0 R1 R2 R3 C0 C1 C2 C3
J1 J2 J3 J4 J5 J6 J7 J8
A B C D
E F G H
I J K L
M N O P
S17
RST
SW1
LOW
HIGH
SW2
LOW
HIGH
SW3
LOW
HIGH
SW4
LOW
HIGH
SW5
LOW
HIGH
SW6
LOW
HIGH
SW7
LOW
HIGH
SW8
LOW
HIGH
D11
LED 1
LED 2
LED 3 D9
D10
D17 D16 D15
D12 D13 D14
INT
D18
D19 D20 D21
USB
EXT
LK10
VBAT
OKAY
VDDIO
OKAY VBOARD
OKAY
USB
EXT
LK9
USB
EXT
LK8
J10
D2
DAUGHTERBOARD
MOTHERBOARD
S13 S14 S15 S16
S9 S10 S11 S12
S5 S6 S7 S8
S1 S2 S3 S4
D1 D4 D5 D7 D3 D2 D6 D8
LE
D
2
KP GP
I
GP
O
LE
D
3
KP GP
I
GP
O
KP GP
I
GP
O
KP GP
I
GP
O
KP GP
I
GP
O
KP GP
I
GP
O
KP GP
I
GP
O
KP GP
I
GP
O
LK
1
LK
2
0
76
51
-00
3
12
11
10
1
9
8
7
6
5
4
3
2
Figure 2.
Table 1. Feature Descriptions
Feature Description
1 Mini USB connector. This allows a connection to a PC/laptop USB port.
2
Board power selection. By default, the board is powered from the USB, and the jumpers are set to USB. The USB power
rail supplies three LDOs, which provide the VBAT (4.5 V), VDDIO (2.7 V) , and VBOARD (3.3 V) rails. The user can also power
the board from an external source via J10. The jumper settings should be moved to EXT if an external power supply is
used. See the ADP5520 data sheet for the supply ranges of VBAT and VDDIO. VBOARD should be supplied with 3.3 V.
3 Supply okay indicator LEDs (green).
4 Selection Block J1 to Selection Block J8 are used to configure the function of each of the eight I/O pins (R0, R1, R2, R3,
C0, C1, C2, C3) of the ADP5520. Each pin can be configured as a general-purpose input (GPI), general-purpose output
(GPO), or keypad (KP) matrix row/column. Pin R3 and Pin C3 can also be configured as auxiliary LED current sinks (LED3,
LED2).
5 GPO high/low indicator LEDs (red). When the LED is on, the GPO is high. When the LED is off, the GPO is low.
6 Keypad matrix. This can be used with I/O pins for keypad decoding.
7 GPI input switches. These can be used to drive I/O pins configured as general-purpose inputs.
8 D9, D10, and D11 are auxiliary LEDs. They are colored red, green, and blue for differentiation. They can be controlled by
the R3, C3, and ILED pins of the ADP5520.
9 General reset for the ADP5520. This is connected to the RST pin (labeled nRST on the board).
10 Backlight white LEDs.
11 Ambient light sensor.
12
Interrupt indication LED (red). This LED lights up if an interrupt is active on the INT pin (labeled nINT on the board).