See Figure 6 for a read example using the repeated start condition to specify th" />
參數(shù)資料
型號(hào)： DS4550E+
廠商： Maxim Integrated Products
文件頁(yè)數(shù)： 9/18頁(yè)
文件大?。?/td> 0K
描述： IC I/O EXPANDER I2C 9B 20TSSOP
產(chǎn)品培訓(xùn)模塊： Lead (SnPb) Finish for COTS
Obsolescence Mitigation Program
標(biāo)準(zhǔn)包裝： 74
接口： I²C，JTAG
輸入/輸出數(shù)： 9
中斷輸出： 無(wú)
頻率 - 時(shí)鐘： 400kHz
電源電壓： 2.7 V ~ 5.5 V
工作溫度： -40°C ~ 85°C
安裝類型： 表面貼裝
封裝/外殼： 20-TSSOP（0.173"，4.40mm 寬）
供應(yīng)商設(shè)備封裝： 20-TSSOP
包裝： 管件
包括： EEPROM
See Figure 6 for a read example using the repeated
start condition to specify the starting memory location.
Reading Multiple Bytes from a Slave: The read oper-
ation can be used to read multiple bytes with a single
transfer. When reading bytes from the slave, the master
simply ACKs the data byte if it desires to read another
byte before terminating the transaction. After the mas-
ter reads the last byte, it must NACK to indicate the end
of the transfer and generate a stop condition.
Applications Information
Power Supply Decoupling
To achieve best results, it is highly recommended that a
decoupling capacitor is used on the IC power-supply
pins. Typical values of decoupling capacitors are 0.01F
and 0.1F. Use a high-quality, ceramic, surface-mount
capacitor, and mount it as close as possible to the VCC
and GND pins of the IC to minimize lead inductance.
DS4550
I2C and JTAG Nonvolatile 9-Bit I/O
Expander Plus Memory
____________________________________________________________________
17
Figure 6. I2C Communication Examples
SLAVE
ADDRESS*
START
1
0
1
0
A2
A1
A0
R/W
SLAVE
ACK
SLAVE
ACK
SLAVE
ACK
MSB
LSB
MSB
LSB
MSB
LSB
b7
b6
b5
b4
b3
b2
b1
b0
READ/
WRITE
REGISTER ADDRESS
b7
b6
b5
b4
b3
b2
b1
b0
DATA
STOP
SINGLE BYTE WRITE
-WRITE I/O CONTROL 0
REGISTER TO 00h
SINGLE BYTE WRITE
-WRITE PULLUP ENABLE 0
REGISTER TO FFh
SINGLE BYTE READ
-READ I/O STATUS 0 RESISTER
TWO BYTE WRITE
-WRITE I/O CONTROL 0 AND
I/O CONTROL 1 REGISTERS TO 00h
START
STOP
1 0100000
11110 010
A0h
F2h
START
REPEATED
START
A1h
MASTER
NACK
STOP
1 0100000
11111 000
F8h
10100 001
1 0100000
11110 010
A0h
F2h
STOP
I/O STATUS
START 1 0100000
11110 000
A0h
F0h
STOP
DATA
FFh
00h
EXAMPLE I2C TRANSACTIONS (WHEN A0, A1, AND A2 ARE CONNECTED TO GND)
TYPICAL I2C WRITE TRANSACTION
*THE SLAVE ADDRESS IS DETERMINED BY ADDRESS PINS A0, A1, AND A2.
00 000 000
1 111 1 111
A0h
00000000
TWO BYTE READ
-READ I/O STATUS 0 AND I/O
STATUS 1 RGISTERS
A)
C)
B)
D)
START
STOP
101000 00
111 11000
A0h
F8h
A1h
1010 0001
I/O STATUS 0
DATA
I/O STATUS 1
DATA
SLAVE
ACK
SLAVE
ACK
SLAVE
ACK
SLAVE
ACK
SLAVE
ACK
SLAVE
ACK
SLAVE
ACK
SLAVE
ACK
SLAVE
ACK
SLAVE
ACK
SLAVE
ACK
SLAVE
ACK
SLAVE
ACK
SLAVE
ACK
SLAVE
ACK
SLAVE
ACK
MASTER
ACK
MASTER
NACK
REPEATED
START
00000000
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