pca9561 NXP Semiconductors, pca9561 Datasheet - Page 9

• Manufacturer Part Number: pca9561
• Description: Quad 6-bit Multiplexed I2c Eeprom Dip Switch
• Manufacturer: NXP Semiconductors

Philips Semiconductors
Bus Transactions
Data is transmitted to the PCA9561 registers using Write Byte transfers (see Figures 7 and 8). Data is read from the PCA9561 registers using
Read and Receive Byte transfers (see Figure 9).
2004 May 17
start condition
S
start condition
Quad 6-bit multiplexed I
S
start condition
1
1
S
0
0
1
0
slave address
0
slave address
0
1
1
0
slave address
1
1
1
A1 A0
A1 A0
1
A1 A0
R/W
acknowledge
R/W
acknowledge
0
0
from slave
from master
A
A
R/W
acknowledge
0
from slave
0
1
A
0
1
Figure 8. WRITE on 2 EEPROMs — assuming WP = 0
control register write on
Figure 7. WRITE on 1 EEPROM — assuming WP = 0
2
0
control register read
1
0
C EEPROM DIP switch
EEPROM byte 0
MUX_IN values
write on EEPROM byte 0
0
1
0
control register
0
0
1
Figure 9. READ MUX_IN register
0
1
0
0
1
0
acknowledge
from master
0
1
0
0
A
A
acknowledge
from slave
restart
0
9
S
X
A
1
X D5
EEPROM byte 0 data
X
0
slave address
X
D4 D3 D2 D1 D0
0
EEPROM byte 0 data
D5 D4 D3 D2 D1
1
1
A1 A0
R/W
acknowledge
from master
1
A
acknowledge
D0
from slave
A
X
A
0
X
EEPROM byte 1 data
P
D5
0
data from MUX_IN
0
D4 D3 D2 D1 D0
stop condition
4
3
PCA9561
Product data sheet
2
acknowledge
from slave
no acknowledge
from master
SW00956
1
stop condition
stop condition
SW00958
0
SW00957
A
NA
P
P