PCA9675DB datasheet(20/34 Pages) PHILIPS

20 / 34 page

PCA9675_1

Product data sheet

Rev. 01 — 1 February 2007

20 of 34

NXP Semiconductors

PCA9675

Remote 16-bit I/O expander for Fm+ I2C-bus with interrupt

10.3 Differences between the PCA9675 and the PCF8575

The PCA9675 is a drop in replacement for the PCF8575 and can used without electrical

or software modiﬁcations, but there is a difference in interrupt output release timing during

the read operation.

Write operations are identical. At the completion of each 8-bit write sequence the data is

stored in its associated 8-bit write register at ACK or NACK. The ﬁrst byte goes to P0n

while the second goes to P1n. Subsequent writes without a STOP wrap around to P0n

then P1n again. Any write will update both read registers and clear interrupts.

Read operations are identical. Both devices update the byte register with the pin data as

each 8-bit read is initiated, the very ﬁrst read after an address cycle corresponds to ports

P0n while the second (even byte) corresponds to P1n and subsequent reads without a

STOP wrap around to P0n then P1n again.

During read operations, the PCA9675 interrupt output will be cleared in a byte-wise

fashion as each byte is read. Reading the ﬁrst byte will clear any interrupts associated

with the P0n pins. This ﬁrst byte read operation will have no effect on interrupts associated

with changes of state on the P1n pins. Interrupts associated with the P1n pins will be

cleared when the second byte is read. Reading the second byte has no effect on

interrupts associated with the changes of state on the P0x pins. The PCF8575 interrupt

output will clear after reading both bytes of data regardless of whether data was changed

in the ﬁrst byte or the second byte or both bytes.

11. Limiting values

[1]

Total package (maximum) output current is 600 mA.

Table 4.

Limiting values

In accordance with the Absolute Maximum Rating System (IEC 60134).

Symbol

Parameter

Conditions

Min

Max

Unit

VDD

supply voltage

−0.5

IDD

supply current

±100

ISS

ground supply current

±600

input voltage

VSS − 0.5

5.5

input current

±20

output current

±50[1]

Ptot

total power dissipation

600

P/out

power dissipation per output

200

Tstg

storage temperature

−65

+150

°C

Tamb

ambient temperature

operating

−40

+85

°C

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