TPS23861 Automatic mode configuration

Hi Fernando,

What value you wrote to the 0x11 register of fifth device? I want to check the AUTO bit in register 0x11. If you want to use Auto Mode, the AUTO bit should be set.

Regarding the 0x43 register, I have to check with our firmware engineer.

Best regards,
Penny

Hi Penny,

The value of the AUTO bit is set in the 0x11 register.

By I2C link I make the following initialization sequence for the five devices with broadcast commands:

Reset all devices

0x60 Global Address

0x4E 0x20 wait time 20 msg.

0xAA Unlock Code

0x00 Temporary common slave address

0x00 Temporary common slave address R/W=0

0x1A Command code, Reset register

0xD0 write data to all devices, with RESAL bit to set

0x04 0xB0 wait time 1,2 msg.

Assigning addresses of all devices

0x60 Global Address

wait time 20 msg.

0xAA Unlock Code

0x00 Temporary common slave address

0x00 Temporary common slave address R/W=0

0x11 Command code, I2C Eslave Address

0xA1 Address 0x21 for the first device with the AUTO bit to set

0xA2 Address 0x22 for the second device with the AUTO bit to set

0xA3 Address 0x23 for the third device with the AUTO bit to set

0xA4 Address 0x24 for the fourth device with the AUTO bit to set

0xA5 Address 0x25 for the fifth device with the AUTO bit to set

After I read the contents of register 0x11 and check that all devices respond correctly me with the assigned address and bit AUTO 1

0xA1; 0xA2; 0xA3; 0xA4; 0xA5

After I read the contents of the following registers and device address 0x22 has values different devices with address 0x21, 0x23, 0x24 and 0x25

Register (CMD CODE)	Devices with address 0x21, 0x23, 0x24, 0x25	Device with addres 0x22
01	0xE4	0x80
12	0xFF	0x00
13	0x0F	0x00

14	0xFF	0x00
15	0xF0	0x00
21	0x55	0x00
43	0xE3	0xE2

 

I have repeated this same sequence with five different chip with the following result:

Register (CMD CODE)	Device with addres 0x24	Devices with address 0x21, 0x22, 0x23, 0x25
01	0xE4	0x80
12	0xFF	0x00
13	0x0F	0x00

14	0xFF	0x00
15	0xF0	0x00
21	0x55	0x00
43	0xE3	0xE2

 

Best regards,

Fernando

Hi  Fernando,

Thank you very much for the additional information. Please help me clarify the below items:

1. Could you please take a picture of the devices that report "0xE2" in register 0x43? We want to make sure the devices have the same silicon version. 
2. After you write the new address to each device, could read the slave address from register 0x11 to double check the write is successful? 
3. Please review TPS23861 datasheet on page 39 which explains the programming sequence. The first step is write an unlock code, temporary address through a broadcast address 0x30. I didn't see the broadcast address 0x30 in your step, so please double check that.
4. Can you send your schematic to me and I want double check the connection of A3, AIN and AOUT pin of each device. 

Thanks,

Penny

SE1877_1 P2_6.pdf

Hi Penny,

Thank you very much for your help me.

1. I have tried to take a photo but it does not look good, sorry.

I have found that there are no external differences between them, all are marked equal     TPS23861PW

              4AKG4

       C69S

1. After writing the new directions, I have read many times 0x11 register and all addresses have been written successfully on all devices.

1. I have done the same sequence with the 0x30 broadcast address and the result is the same.

1. I send you the schematic of my design.

You can check that the A3 pin is tied low for all devices with zero ohm resistor. The connection of the AIN and AOUT pins also is made with zero ohm resistor.

 

Best regards,

Fernando

Hi Fernando,

Your schematic looks good to me. I have one concern about the power on sequence of the system, especially the 48V and 3.3V. Please refer to our app note. I don't think device on your board should have  0xE2 in register 43. Do you have TPS23861EVM and GUI to verify that?

Best regards,

Penny

www.ti.com/.../slva723.pdf

Hi Penny,

To ensure the correct power up sequence I have put a 24V zener diode in series with the bias resistors of the base of the bipolar transistor. So I guarantee that when VDD = 2.8V, the tension in VPWR is greater than 18,5V and everything works OK.

I do not have TPS23861EVM and GUI to verify the contents of register 43, I access the content of registers using I2C commands described in the data sheet.

I replaced the devices with content 0xE2 in the register 43 by other new devices and I have verified to work correctly and the contents of register 43 is 0xE3 in all. In total 15 devices I tested, 10 are working properly (register 43 0xE3) and 5 do not working properly (register 43 0xE2). It not which is the reason why this has happened.

I need to limit the power output for each of the ports on the same device.

Can I do this by setting the registers?

Can I configure permanent, even with loss of power?

How do I configure them?

For example: port 1 Class 0 "13W"; Port 2 Class 1 "3,84W"; Port 3 Class 2 "6,49W"; Port 4 Class 4 "25,5W"

Best regards

Hi Penny,

I have prepared 5 pcs, how you send them?

Best regards

Fernando

Hi Fernando,

Can I have your email and I can send you my address. Thanks.

Best regards,

Penny