STEVAL-ISQ002V1 STMicroelectronics, STEVAL-ISQ002V1 Datasheet - Page 10

• Manufacturer Part Number: STEVAL-ISQ002V1
• Description: BOARD EVAL BASED ON ST72264G1
• Manufacturer: STMicroelectronics

Specifications of STEVAL-ISQ002V1

• Main Purpose: Interface, PMBus
• Embedded: Yes, MCU, 8-Bit
• Utilized Ic / Part: ST72F264
• Primary Attributes: The PMBus™ Interface Using the ST7 I2C Peripheral
• Secondary Attributes: Firmware in C Language
• Product: Power Management Modules
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: 497-6423

Implementation of PMBus using ST7 I2C
10/43
Figure 5.
During the PMBus communication, if there are any errors in communication (acknowledge
failure, arbitration loss, bus error or SMBus timeout), the I
initialized again inside the PMBus write/ read functions.
In case the SMBus Alert pin is pulled low by the slave to inform the master that it wants to
communicate, the slave address is programmed with the alert response address (0x18).
This is acknowledged by the slave that alerted the master. After the communication between
the master and slave is complete, the slave address is programmed with the user-defined
slave address. The default value of this user-defined address is 0x30.
In case of group operation, the write operation flowchart is followed without the stop
condition.
Check if SMBus_Mode for Write
Check if SMBus_Mode for Write
Check if SMBus_Mode for
Check if SMBus_Mode for
Write Block command
Send Byte command
Word command
Byte command
Flowchart: write operation
START
STOP
No
No
No
Doc ID 13286 Rev 2
S
S
1
S
1
S
1
1
Yes
Yes
Yes
Yes
Slave Address
Slave Address
Slave Address
Slave Address
7
7
7
7
SMBus Write block protocol
SMBus Send byte protocol
SMBus Write word protocol
SMBus Write byte protocol
Data Byte 2
Wr
Wr
Wr
Wr
1
1
1
1
8
A
A
A
1
1
A
1
1
Command Code
Command Code
Command Code
Data Byte
A
1
8
8
8
8
...
...
Data Byte N
2
C peripheral is disabled. It is re-
A
1
A
1
A
1
A
1
8
1
P
Byte Count = N
Data Byte Low
Data Byte
8
8
8
1
A
P
1
Rd
1
A
1
1
A
A
1
P
1
Data Byte HIgh
Data Byte 1
8
8
A
AN2511
1
P
A
1
1
...