th May 2012 www.semtech.com 15 SX1504/SX1505/SX1506 4/8/16 Channel GP" />
參數(shù)資料
型號： SX1506I091TRT
廠商： Semtech
文件頁數(shù)： 7/31頁
文件大?。?/td> 0K
描述： IC GPIO EXP I2C 16CH 28UTQFN
標準包裝： 1
接口： I²C
輸入/輸出數(shù)： 16
中斷輸出： 是
頻率 - 時鐘： 400kHz
電源電壓： 2.5 V ~ 5.5 V
工作溫度： -40°C ~ 85°C
安裝類型： 表面貼裝
封裝/外殼： 28-UFQFN 裸露焊盤
供應商設備封裝： 28-QFN-UT（4x4）
包裝： 標準包裝
其它名稱： SX1506I091DKR
WIRELESS & SENSING
Rev 3 – 16
th May 2012
www.semtech.com
15
SX1504/SX1505/SX1506
4/8/16 Channel GPIO
Figure 9 – Write RegData Register
Please note that SX1506 implements register address auto-increment i.e. after the Data ACK from Slave the
master can write further bytes and the interface will handle the register address increment automatically. Finally
the master terminates the transfer normally the stop condition [P].
4.5.2
READ
After the start condition [S], the slave address is sent, followed by an eighth bit indicating a write. The I
2C then
acknowledges that it is being addressed, and the master responds with an 8 bit data byte consisting of the
register address. The slave acknowledges and the master sends the repeated start condition [Sr]. Once again,
the slave address is sent, followed by an eighth bit indicating a read. The slave responds with an acknowledge
and the previously addressed 8 bit data byte; the master then sends a non-acknowledge (NACK). Finally, the
master terminates the transfer with the stop condition [P].
Master operations
SX1504, SX1505 or SX1506 operations (Slave)
S: Start Condition
Slave Address: 7 bit
W: Write = ‘0’
Register Address: 8 bit
R: Read = ‘1’
Data: 8 bit
A: Acknowledge (sent by slave)
NACK: Non-Acknowledge (sent by master)
Sr: Repeated Start Condition
P: Stop condition
Figure 10 - 2-Wire Serial Interface, Read Register Operation
Please note that SX1506 implements register address auto-increment i.e. after the Data byte from Slave the
master can acknowledge (ACK) to indicate that it wants to read the next byte and the interface will handle the
register address increment automatically. Finally the master terminates the transfer normally with a NACK
followed by the stop condition [P].
4.5.3
READ - STOP separated format (SX1504 and SX1505 only)
When operating SX1504 or SX1505, stop-separated reads can also be used. This format allows a master to set
up the register address pointer for a read and return to that slave at a later time to read the data. In this format
the slave address followed by a write command are sent after a start [S] condition. The slave then acknowledges
it is being addressed, and the master responds with the 8-bit register address. The master sends a Stop or
Restart condition and may then address another slave. After performing other tasks, the master can send a start
or restart condition to the slave with a read command. The slave acknowledges this request and returns the data
from the register location that had previously been set up.
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