PCA9500 Просмотр технического описания (PDF) - Philips Electronics
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PCA9500 Datasheet PDF : 23 Pages
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Philips Semiconductors
8-bit I2C and SMBus I/O port with 2-kbit EEPROM
Product data sheet
PCA9500
CONTROL REGISTER
The PCA9500 contains a single 8-bit register called the Control Register, which can be written and read via the I2C-bus. This register is sent
after a successful acknowledgment of the slave address.
It contains the I/O operation information.
I/O OPERATIONS (see also Figure 4)
Each of the PCA9500’s eight I/Os can be independently used as an input or output. Output data is transmitted to the port by the I/O WRITE
mode (see Figure 6). Input I/O data is transferred from the port to the microcontroller by the READ mode (See Figure 7).
SCL
12 345 678
SLAVE ADDRESS (I/O EXPANDER)
DATA TO PORT
SDA S 0 1 0 0 A2 A1 A0 0 A
DATA 1
START CONDITION
WRITE TO
PORT
R/W ACKNOWLEDGE
FROM SLAVE
DATA TO PORT
A
DATA 2
ACKNOWLEDGE
FROM SLAVE
A
ACKNOWLEDGE
FROM SLAVE
DATA OUT
FROM PORT
t pv
Figure 6. I/O WRITE mode (output)
DATA 1 VALID
t pv
DATA 2 VALID
SW00548
SLAVE ADDRESS (I/O EXPANDER)
DATA FROM PORT
SDA
S 0 1 0 0 A2 A1 A0 1 A
DATA 1
READ FROM
PORT
START CONDITION
R/W ACKNOWLEDGE
FROM SLAVE
DATA FROM PORT
A
DATA 4
ACKNOWLEDGE
FROM MASTER
DATA INTO
PORT
DATA 1
DATA 2
DATA 3
t ph
t ps
DATA 4
Figure 7. I/O READ mode (input)
1P
STOP
CONDITION
SW00549
2004 Sep 30
5
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