STEVAL-ISQ002V1 STMicroelectronics, STEVAL-ISQ002V1 Datasheet - Page 23

• 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

AN2511
3.4
----------*/
alerted */
errors
}
Limitations
1.
2.
3.
EnableInterrupts;
MISCR1 = 0x10 ;
/*---------------------PMBus communication configuration-------------------*/
while (1)
{
}
The SMBus driver used in this application note is tested only for write word, read word
and write block protocols with PEC disabled.
The SMBus driver doesn't meet the clock low extending feature of SMBus v1.1 due to
the limitation of the I
In case of PEC, when slave is acting as receiver, the ACK bit is not disabled if the PEC
received from master transmitter is different from slave. It is stored in the user address
as the last byte. It is the responsibility of the user to check the master PEC with the
slave PEC to decide on data validity.
PMBus_Init (SMBs_MISC, SLAVEADD, 0x40, 0x23);
if (SMBus_Mode & SMB_ARA)
{
/* Alerted slave address will be used for any further communication */
}
Command_Code =
PMBus_CommandWrite (Command_Code);
Command_Code =
PMBus_CommandRead (Command_Code);
if (SMB_Err_Status)
{
}
/*----------------------- Alert Interrupt configuration ---------------------
PCOR = CONTROL ;
PCDR = CONTROL ;
*/
PMBus_Err = SMBm_ReceiveByte (ALERTRESPONSEADD, Data_Buff);
SMBus_Mode &= (unsigned char) ~SMB_ARA ;
SMB_Err_Status = I2CSR2 ;
SMB_Err_Status = 0 ;
/* I2C configuration: ST7 I2C address 0x30, communication speed 100kHz */
PMBus_SlaveAdd = *Data_Buff ;
/* ST7 I2C sends the alert response address to check which slave
/* Read data and store it in Data_Buff */
0x01;
0x02;
2
C peripheral.
/* Checking if an alert signal is received from slave */
Doc ID 13286 Rev 2
/* EI0 on falling edge low level for Alert interrupt */
/* User should enter the PMBus command code here */
/* User should enter the PMBus command code here */
/* I2C status register read to clear any
/* Writes data from Data_Buff */
/* Resets interrupt mask */
PMBus commands and source code
/* End of while (1) */
/* End of main */
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