vr5510 i2c

[jiajun]

Hi,

Recently I am debugging the VR5510, and I have some questions.

In "Multi-output PMIC with SMPS and LDO"Section 23 of the document,we can see the I2C message format and communications format

jiajun_0-1724758997440.png

jiajun_1-1724759098170.png

Then I sent my own debugging commands following the communication format,I read a size of 8 bytes

jiajun_2-1724759155548.png

So,here's my question:

1. Am I reading the data correctly?

2. By message format,should be reading 2 bytes of data,so is the data I grabbed from the third to the eighth valid, and if so, please tell me what he represents

My environments:

S32G-VNP-RBD3, S32DS 3.5 

S32G-VNP-RDB3 VR5100 S32G3 

[TomasVaverka]

Hi,

1. Based on the waveform, it appears you are following the correct I2C sequence for writing a register address and then reading from it. You issue a write to set the register address (0x01 - M_MODE) and then you issue a read command, which is correctly acknowledged by the device. The read sequence also shows that each byte is acknowledged by the master, which is a good sign.

2. Why are you reading 8 bytes? Only 2 bytes should be read as specified in the datasheet. The M_MODE register as well as other registers are 2 bytes wide.

It is always a good practice to read at first the M_DEVICEID register.

BRs, Tomas

[jiajun]

Hi,
In S32G,is there an example demonstrating control of the VR5510

[TomasVaverka]

Hi,

It should be provided under the S32G RTD packages. 

We also offer the VR5510 generic SW driver with examples, you can download it from:

https://www.nxp.com/products/power-management/pmics-and-sbcs/pmics/multi-channel-9-pmic-for-s32g-pro...

Screenshot 2024-08-28 093725.png

BRs, Tomas