9536 查看數據表（PDF） - Philips Electronics

零件编号

产品描述 (功能)

生产厂家

9536

4-bit I²C and SMBus I/O port

Philips Electronics 

Philips Semiconductors

4-bit I2C and SMBus I/O port

Objective data sheet

PCA9536

SIMPLIFIED SCHEMATIC OF I/O0 TO I/O3

DATA FROM

SHIFT REGISTER

DATA FROM

SHIFT REGISTER

WRITE

CONFIGURATION

PULSE

WRITE PULSE

CONFIGURATION

REGISTER

DQ

FF

CK Q

DQ

FF

CK Q

OUTPUT

PORT

REGISTER

READ PULSE

Q1

INPUT PORT

REGISTER

DQ

FF

CK Q

100 kΩ

Q2

OUTPUT PORT

REGISTER DATA

VDD

ESD PROTECTION DIODE

I/O0 TO I/O3

ESD PROTECTION DIODE

VSS

INPUT PORT

REGISTER DATA

DATA FROM

SHIFT REGISTER

WRITE

POLARITY

PULSE

DQ

FF

CK Q

POLARITY

INVERSION

REGISTER

NOTE: At Power-on Reset, all registers return to default values.

Figure 3. Simplified schematic of I/O0 to I/O3

POLARITY

REGISTER DATA

SW02192

I/O port

When an I/O is configured as an input, FETs Q1 and Q2 are off, creating a high impedance input with a weak pull-up (100 kΩ typ.) to VDD. The

input voltage may be raised above VDD to a maximum of 5.5 V.

If the I/O is configured as an output, then either Q1 or Q2 is enabled, depending on the state of the output port register. Care should be

exercised if an external voltage is applied to an I/O configured as an output because of the low impedance paths that exist between the pin and

either VDD or VSS.

2004 Aug 20

5

Share Link: