AWR1642BOOST-ODS: TIDA-020011 TIDA-01570 I2C LP87702DRHBRQ1

Krishna Kumar4

Part Number: AWR1642BOOST-ODS
Other Parts Discussed in Thread: AWR1642, LP87702, AWR1642BOOST, MMWAVE-SDK

I notice that both these reference designs connect I2C pins of the AWR1642 to the voltage regulator LP87702DRHBRQ1.

As the software for these designs haven't been made public yet, can you please provide me with the relevant parts of the code for the I2C operation. Or atleast let me know what is the logic used to enable the lp87702 buck boost converter. The standard AWR1642BOOST doesn't use these I2C pins.

over 5 years ago

0 Raghunandan Kamath over 5 years ago

TI__Mastermind 22155 points

Hello Krishna,

Please refer to the I2C driver in the MMWAVE-SDK for the I2C read and write functions.

Let me know if you need any further information.

-Raghu

0 Krishna Kumar4 over 5 years ago in reply to Raghunandan Kamath

Expert 1565 points

Hello Raghu

I think my question wasn't correctly phrased. I don't need information about how to program I2C using mmwave. What I require is, in this particular design the I2C is used to connect to an on board voltage regulator LP87702DRHBRQ1 to enable buck boost. I need this startup shutdown sequence which is sent from AWR1642 to the regulator using I2C.

0 Jitendra Gupta over 5 years ago in reply to Krishna Kumar4

TI__Guru 68160 points

Hi Krishna,
Please refer this similar thread and datasheet for this PMIC.
e2e.ti.com/.../2848218
www.ti.com/.../lp87702-q1.pdf

This PMIC uses default OTP and on this board currently AWR1642 is not sending any command over i2c to change the sequence. But wait till concern expert will update you about i2c startup/shutdown sequence.

Regards,
Jitendra

0 Krishna Kumar4 over 5 years ago in reply to Jitendra Gupta

Expert 1565 points

just pinging for an update

0 Tuomo Alatalo over 5 years ago in reply to Jitendra Gupta

TI__Intellectual 950 points

Hi Krishna,

LP87702 regulator will be enabled by set NRST and EN1 high. No need to I2C controlling. I2C will be needed if some setups need to be changed after OTP read.

When NRST and EN1 = high, OTP read takes approximately 1.2ms after that following startup and shutdown times are valid with the LP87702DRHBRQ1 device

This device has delay setting 0-15ms, so the farther behind values are valid (2ms, 3ms, 3ms, 2ms, 4ms, 1ms)

Regards,

Tuomo

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AWR1642BOOST-ODS: TIDA-020011 TIDA-01570 I2C LP87702DRHBRQ1