PCAL9539A Datasheet, PDF (6/48 Pages) NXP Semiconductors – Low-voltage 16-bit I2C-bus and SMBus low power I/O port with interrupt and reset

NXP Semiconductors
PCAL9539A
16-bit I²C-bus and SMBus low power I/O port with interrupt and reset
(Input, Output, Polarity Inversion, or Configuration) that will be affected. Bit 6 in
conjunction with the lower four bits of the Command byte are used to point to the
extended features of the device (Agile I/O). This register is write only.
B7 B6 B5 B4 B3 B2 B1 B0
002aaf540
Fig 5. Pointer register bits
Table 4. Command byte
Pointer register bits
Command byte Register
B7 B6 B5 B4 B3 B2 B1 B0 ^{(hexadecimal)}
Protocol
Power-up
default
00000000
00h
Input port 0
read byte
xxxx xxxx^[1]
00000001
01h
Input port 1
read byte
xxxx xxxx
00000010
02h
Output port 0
read/write byte 1111 1111
00000011
03h
Output port 1
read/write byte 1111 1111
00000100
04h
Polarity Inversion port 0 read/write byte 0000 0000
00000101
05h
Polarity Inversion port 1 read/write byte 0000 0000
00000110
06h
Configuration port 0
read/write byte 1111 1111
00000111
07h
Configuration port 1
read/write byte 1111 1111
01000000
40h
Output drive strength
read/write byte 1111 1111
register 0
01000001
41h
Output drive strength
read/write byte 1111 1111
register 0
01000010
42h
Output drive strength
read/write byte 1111 1111
register 1
01000011
43h
Output drive strength
read/write byte 1111 1111
register 1
01000100
44h
Input latch register 0
read/write byte 0000 0000
01000101
45h
Input latch register 1
read/write byte 0000 0000
01000110
46h
Pull-up/pull-down enable read/write byte 0000 0000
register 0
01000111
47h
Pull-up/pull-down enable read/write byte 0000 0000
register 1
01001000
48h
Pull-up/pull-down
read/write byte 1111 1111
selection register 0
01001001
49h
Pull-up/pull-down
read/write byte 1111 1111
selection register 1
01001010
4Ah
Interrupt mask register 0 read/write byte 1111 1111
01001011
4Bh
Interrupt mask register 1 read/write byte 1111 1111
01001100
4Ch
Interrupt status register 0 read byte
0000 0000
01001101
4Dh
Interrupt status register 1 read byte
0000 0000
01001111
4Fh
Output port configuration read/write byte 0000 0000
register
[1] Undefined.
PCAL9539A
Product data sheet
All information provided in this document is subject to legal disclaimers.
Rev. 1 — 3 October 2012
© NXP B.V. 2012. All rights reserved.
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