Datasheet

ADP5520
Rev. A | Page 6 of 40
PIN CONFIGURATION AND FUNCTION DESCRIPTIONS
07445-003
PIN 1
INDICATOR
1PGND
2SW
3nINT
4SDA
5SCL
6R2
15 nRST
16 VDDIO
17 CMP_IN
18 GND
14 ILED
13 R3
7
R1
8
R0
9
C0
11
C2
12
C3
10
C1
21
VBAT
22
BST
23
BL_SNK
24
GND
20
CAP_OUT
19
GND
TOP VIEW
(Not to Scale)
ADP5520
NOTES
1. EXPOSED PAD MUST BE CONNECTED
TO GROUND.
Figure 3. Pin Configuration
Table 5. Pin Function Descriptions
Pin No. Mnemonic Description
1 PGND Power Switch Output to Ground.
2 SW Power Switch Input.
3 nINT Processor Interrupt. This pin is active low, open drain, and should be pulled up to VDDIO.
4 SDA I
2
C-Compatible Serial Data Line. Open drain requires external pull-up to VDDIO.
5 SCL I
2
C-Compatible Serial Clock Line. Open drain requires external pull-up to VDDIO.
6 R2 Row 2 when configured in a keypad matrix, D2 when configured as an I/O.
7 R1 Row 1 when configured in a keypad matrix, D1 when configured as an I/O.
8 R0 Row 0 when configured in a keypad matrix, D0 when configured as an I/O.
9 C0 Column 0 when configured in a keypad matrix, D4 when configured as an I/O.
10 C1 Column 1 when configured in a keypad matrix, D5 when configured as an I/O.
11 C2 Column 2 when configured in a keypad matrix, D6 when configured as an I/O.
12 C3 Column 3 when configured in a keypad matrix, D7 when configured as an I/O, LED 2 when configured as a current sink.
13 R3 Row 3 when configured in a keypad matrix, D3 when configured as an I/O, LED 3 when configured as a current sink.
14 ILED LED 1 Current Sink.
15 nRST
Reset Input, Active Low. This input signal resets the device to the power-up default conditions. Must be driven low
for 75 µs (typical) to be valid.
16 VDDIO
Supply Voltage for the I/O Pins. Voltage is 1.7 V to 3.3 V (or VBAT, whichever is smaller). If VDDIO = 0, the device goes
into full shutdown mode.
17 CMP_IN Input for Ambient Light Sensing.
18 GND Ground.
19 GND Ground.
20 CAP_OUT
Capacitor for Internal 2.7 V LDO. A 1 F capacitor must be connected between this pin and GND. Do not use this
pin to supply external loads.
21 VBAT Main Supply Voltage for the IC (2.7 V to 5.5 V).
22 BST Overvoltage Monitor Input for the Boost Converter.
23 BL_SNK Backlight Current Sink.
24 GND Ground.