參數(shù)資料
型號： PCA9561
廠商： NXP Semiconductors N.V.
英文描述： Quad 6-bit multiplexed I2C EEPROM DIP switch
中文描述： 四6位多路復(fù)用的I2C EEPROM的DIP開關(guān)
文件頁數(shù)： 4/17頁
文件大?。?/td> 111K
代理商： PCA9561
Philips Semiconductors
Product data
PCA9561
Quad 6-bit multiplexed I
2
C EEPROM DIP switch
2003 Jun 27
4
DEVICE ADDRESS
Following a START condition the bus master must output the
address of the slave it is accessing. The address of the PCA9561 is
shown in Figure 1. To conserve power, no internal pull-up resistors
are incorporated on the hardware selectable address pins and they
must be pulled HIGH or LOW.
The last bit of the slave address byte defines the operation to be
performed. When set to logic 1 a read is selected while a logic 0
selects a write operation.
0
0
1
A1
A0
R/W
1
1
SW00955
MSB
LSB
FIXED
PROGRAMMABLE
Figure 1. Slave address
CONTROL REGISTER
Following the successful acknowledgement of the slave address,
the bus master will send a byte to the PCA9561, which will be stored
in the control register. This register can be written and read via the
I
2
C-bus.
D6
D5
D4
D2
D1
D0
D7
D3
SW00954
Figure 2. Control Register
CONTROL REGISTER DEFINITION
Following the address and acknowledge bit with logic 0 in the read/write bit, the first byte written is the command byte. If the command byte is
reserved and therefore not valid, it will not be acknowledged. Only valid command bytes will be acknowledged.
Table 1. Register Addresses
D7
D6
D5
D4
D3
D2
D1
D0
REGISTER
NAME
TYPE
REGISTER
FUNCTION
0
0
0
0
0
0
0
0
EEPROM 0
Read/Write
EEPROM byte 0
register
EEPROM byte 1
register
EEPROM byte 2
register
EEPROM byte 3
register
MUX_IN values
register
0
0
0
0
0
0
0
1
EEPROM 1
Read/Write
0
0
0
0
0
0
1
0
EEPROM 2
Read/Write
0
0
0
0
0
0
1
1
EEPROM 3
Read/Write
1
1
1
1
1
1
1
1
MUX_IN
Read
Table 2. Commands
D7
1
1
1
1
1
1
D6
1
1
1
1
1
1
D5
1
1
1
1
1
1
D4
1
1
1
1
1
1
D3
1
1
1
1
1
1
D2
0
1
0
1
X
X
D1
0
0
X
X
1
X
D0
0
0
1
1
0
1
COMMAND
MUX_OUT from EEPROM byte 0
MUX_OUT from EEPROM byte 1
MUX_OUT from EEPROM byte 2
MUX_OUT from EEPROM byte 3
MUX_OUT from MUX_IN
MUX_OUT from MUX_SELECT
2
NOTE:
1. All other combinations are reserved.
2. MUX_SELECT pins select between MUX_IN and EEPROM to MUX_OUT.
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