PCA8575
Remote 16-bit I/O expander for I
2
C-bus with interrupt
Rev. 01 — 30 November 2006
Objective data sheet
1. General description
The PCA8575 provides general purpose remote I/O expansion for most microcontroller
families via the two-line bidirectional I
2
C-bus (serial clock (SCL), serial data (SDA)).
The device consists of a 16-bit quasi-bidirectional port and an I
2
C-bus interface. The
PCA8575 has a low current consumption and includes latched outputs with high current
drive capability for directly driving LEDs.
The PCA8575 also possesses an interrupt line (INT) which can be connected to the
interrupt logic of the microcontroller. By sending an interrupt signal on this line, the remote
I/O can inform the microcontroller if there is incoming data on its ports without having to
communicate via the I
2
C-bus. The internal Power-On Reset (POR) initializes the I/Os as
inputs.
2. Features
I
I
I
I
I
I
I
I
I
I
I
400 kHz I
2
C-bus interface
2.3 V to 5.5 V operation with 5.5 V tolerant I/Os
16-bit remote I/O pins that default to inputs at power-up
Latched outputs with 25 mA sink capability for directly driving LEDs
Total package sink capability of 400 mA
Active LOW open-drain interrupt output
8 programmable slave addresses using 3 address pins
Readable device ID (manufacturer, device type, and revision)
Low standby current (10
µA
max.)
−40 °C
to +85
°C
operation
ESD protection exceeds 2000 V HBM per JESD22-A114, 200 V MM per
JESD22-A115, and 1000 V CDM per JESD22-C101
I
Latch-up testing is done to JEDEC standard JESD78 which exceeds 100 mA
I
Packages offered: SO24, SSOP24 (QSOP24), TSSOP24, HVQFN24, DHVQFN24
3. Applications
I
I
I
I
I
I
LED signs and displays
Servers
Industrial control
Medical equipment
PLCs
Cellular telephones
NXP Semiconductors
PCA8575
Remote 16-bit I/O expander for I
2
C-bus with interrupt
I
Gaming machines
I
Instrumentation and test measurement
4. Ordering information
Table 1.
Ordering information
Topside
mark
PCA8575D
PCA8575
Package
Name
SO24
SSOP24
[1]
Description
plastic small outline package; 24 leads; body width 7.5 mm
plastic shrink small outline package; 24 leads;
body width 3.9 mm; lead pitch 0.635 mm
plastic thin shrink small outline package; 24 leads;
body width 4.4 mm
Version
SOT137-1
SOT556-1
SOT355-1
SOT815-1
SOT616-1
Type number
PCA8575D
PCA8575DB
PCA8575DK
PCA8575PW
PCA8575BQ
PCA8575BS
PCA8575DB SSOP24
plastic shrink small outline package; 24 leads; body width 5.3 mm SOT340-1
PCA8575PW TSSOP24
8575
8575
DHVQFN24 plastic dual in-line compatible thermal enhanced very thin quad
flat package; no leads; 24 terminals; body 3.5
×
5.5
×
0.85 mm
HVQFN24
plastic thermal enhanced very thin quad flat package; no leads;
24 terminals; body 4
×
4
×
0.85 mm
[1]
Also known as QSOP24.
5. Block diagram
PCA8575
INT
AD0
AD1
AD2
SCL
SDA
INPUT
FILTER
I
2
C-BUS
CONTROL
SHIFT
REGISTER
16 BITS
I/O
PORT
P00 to P07
P10 to P17
INTERRUPT
LOGIC
LP FILTER
write pulse
read pulse
V
DD
V
SS
POWER-ON
RESET
002aac669
Fig 1. Block diagram of PCA8575
PCA8575_1
© NXP B.V. 2006. All rights reserved.
Objective data sheet
Rev. 01 — 30 November 2006
2 of 30
NXP Semiconductors
PCA8575
Remote 16-bit I/O expander for I
2
C-bus with interrupt
write pulse
I
trt(pu)
data from Shift Register
D
FF
CI
S
power-on reset
D
FF
read pulse
CI
S
Q
Q
100
µA
I
OH
V
DD
I
OL
P00 to P07
P10 to P17
V
SS
data to Shift Register
002aab631
to interrupt logic
Fig 2. Simplified schematic diagram of P00 to P17
6. Pinning information
6.1 Pinning
INT
AD1
AD2
P00
P01
P02
P03
P04
P05
1
2
3
4
5
6
7
8
9
24 V
DD
23 SDA
22 SCL
21 AD0
20 P17
19 P16
18 P15
17 P14
16 P13
15 P12
14 P11
13 P10
002aac670
INT
AD1
AD2
P00
P01
P02
P03
P04
P05
1
2
3
4
5
6
7
8
9
24 V
DD
23 SDA
22 SCL
21 AD0
20 P17
19 P16
18 P15
17 P14
16 P13
15 P12
14 P11
13 P10
002aac671
PCA8575D
PCA8575PW
P06 10
P07 11
V
SS
12
P06 10
P07 11
V
SS
12
Fig 3. Pin configuration for SO24
Fig 4. Pin configuration for TSSOP24
PCA8575_1
© NXP B.V. 2006. All rights reserved.
Objective data sheet
Rev. 01 — 30 November 2006
3 of 30
NXP Semiconductors
PCA8575
Remote 16-bit I/O expander for I
2
C-bus with interrupt
INT
AD1
AD2
P00
P01
P02
P03
P04
P05
1
2
3
4
5
6
7
8
9
24 V
DD
23 SDA
22 SCL
21 AD0
20 P17
19 P16
18 P15
17 P14
16 P13
15 P12
14 P11
13 P10
002aac672
INT
AD1
AD2
P00
P01
P02
P03
P04
P05
1
2
3
4
5
6
7
8
9
24 V
DD
23 SDA
22 SCL
21 AD0
20 P17
19 P16
18 P15
17 P14
16 P13
15 P12
14 P11
13 P10
002aac673
PCA8575DK
PCA8575DB
P06 10
P07 11
V
SS
12
P06 10
P07 11
V
SS
12
Fig 5. Pin configuration for SSOP24
(QSOP24)
Fig 6. Pin configuration for SSOP24
terminal 1
index area
AD1
20 SDA
24 AD2
23 AD1
19 SCL
21 V
DD
terminal 1
index area
P00
P01
P02
P03
P04
P05
1
2
3
4
5
6
P10 10
P11 11
P12 12
7
8
9
22 INT
AD2
P00
P01
18 AD0
17 P17
16 P16
15 P15
14 P14
13 P13
P02
P03
P04
P05
2
3
4
5
6
7
8
9
24 V
DD
23 SDA
22 SCL
21 AD0
20 P17
19 P16
18 P15
17 P14
16 P13
15 P12
14 P11
P10 13
PCA8575BQ
PCA8575BS
P06 10
P07 11
V
SS
12
P06
P07
V
SS
1
INT
002aac674
002aac675
Transparent top view
Transparent top view
Fig 7. Pin configuration for HVQFN24
Fig 8. Pin configuration for DHVQFN24
PCA8575_1
© NXP B.V. 2006. All rights reserved.
Objective data sheet
Rev. 01 — 30 November 2006
4 of 30
NXP Semiconductors
PCA8575
Remote 16-bit I/O expander for I
2
C-bus with interrupt
6.2 Pin description
Table 2.
Symbol
Pin description
Pin
SO24, SSOP24,
HVQFN24
TSSOP24, DHVQFN24
INT
AD1
AD2
P00
P01
P02
P03
P04
P05
P06
P07
V
SS
P10
P11
P12
P13
P14
P15
P16
P17
AD0
SCL
SDA
V
DD
[1]
Description
1
2
3
4
5
6
7
8
9
10
11
12
[1]
13
14
15
16
17
18
19
20
21
22
23
24
22
23
24
1
2
3
4
5
6
7
8
9
[1]
10
11
12
13
14
15
16
17
18
19
20
21
interrupt output (active LOW)
address input 1
address input 2
quasi-bidirectional I/O 00
quasi-bidirectional I/O 01
quasi-bidirectional I/O 02
quasi-bidirectional I/O 03
quasi-bidirectional I/O 04
quasi-bidirectional I/O 05
quasi-bidirectional I/O 06
quasi-bidirectional I/O 07
supply ground
quasi-bidirectional I/O 10
quasi-bidirectional I/O 11
quasi-bidirectional I/O 12
quasi-bidirectional I/O 13
quasi-bidirectional I/O 14
quasi-bidirectional I/O 15
quasi-bidirectional I/O 16
quasi-bidirectional I/O 17
address input 0
serial clock line input
serial data line input/output
supply voltage
HVQFN and DHVQFN package die supply ground is connected to both the V
SS
pin and the exposed center
pad. The V
SS
pin must be connected to supply ground for proper device operation. For enhanced thermal,
electrical, and board-level performance, the exposed pad needs to be soldered to the board using a
corresponding thermal pad on the board, and for proper heat conduction through the board thermal vias
need to be incorporated in the PCB in the thermal pad region.
PCA8575_1
© NXP B.V. 2006. All rights reserved.
Objective data sheet
Rev. 01 — 30 November 2006
5 of 30
Microcontroller MCU
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