STV9432TAP Ver la hoja de datos (PDF) - STMicroelectronics
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STV9432TAP
STMicroelectronics
STV9432TAP Datasheet PDF : 25 Pages
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STV9432TAP
7 - SERIAL INTERFACE
The 2-wires serial interface is an I2C interface. To be
connected to the I2C bus, a device must own its slave
address; the slave address of the STV9432TAP is BA
(in hexadecimal).
A6 A5 A4 A3 A2 A1 A0 RW
1011 1 0 1
7.1 - Data Transfer in Write Mode
The host MCU can write data into the STV9432TAP
registers or RAM.
To write data into the STV9432TAP, after a start, the
MCU must send (Figure 2):
- First, the I2C address slave byte with a low level for
the R/W bit,
- The two bytes of the internal address where the
MCU wants to write data,
Figure 2. I2C Write Operation
- The successive bytes of data.
All bytes are sent MSB bit first and the write data
transfer is closed by a stop.
7.2 - Data Transfer in Read Mode
The host MCU can read data from the STV9432TAP
register, RAM or ROM.
To read data from the STV9432TAP (Figure 3), the
MCU must send 2 different I2C sequences. The first
one is made of I2C slave address byte with R/W bit at
low level and the 2 internal address bytes.
The second one is made of I2C slave address byte
with R/W bit at high level and all the successive data
bytes read at successive addresses starting from the
initial address given by the first sequence.
SCL
SDA
Start
I2C Slave Address
R/W
A7 A6 A5 A4 A3 A2 A1 A0
-
ACK
LSB Address
ACK
- A13 A12 A11 A10 A9 A8
MSB Address
ACK
SCL
SDA
D7 D6 D5 D4 D3 D2 D1 D0
D7 D6 D5 D4 D3 D2 D1 D0
Data Byte 1
ACK
Data Byte 2
ACK
D7 D6 D5 D4 D3 D2 D1 D0
Data Byte n
ACK
Stop
Figure 3. I2C Read Operation
SCL
SDA
Start
I2C Slave Address
R/W
A7 A6 A5 A4 A3 A2 A1 A0
- - A13 A12 A10 A10 A9 A8
ACK
LSB Address
ACK
MSB Address
ACK
Stop
SCL
SDA
Start
I2C Slave Address
R/W
D7 D6 D5 D4 D3 D2 D1 D0
D7 D6 D5 D4 D3 D2 D1 D0
ACK*
Data Byte 1
ACK
Data Byte n
ACK
Stop
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