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replacement part for CAT34

Danny Cheng1
Prodigy 585 points
Other Parts Discussed in Thread: TMP1075, TMP468, TMP117, TMP461, TMP464, TMP139, TMP75

HI Team,

would you have any thoughts for the possible replacement part with CAT34? I know it is not the full part number, but if you have some info please share to us. 

If you don't have, could you please share some details about the differences between each temp sensor and how to choose? what is the popular part for Intel Eagle Stream platform. Thanks 

  • 0
    TI__Mastermind 27535 points

    Hi Danny,

    Thank you for your post. 

    Assuming you are referring to the CAT34TS02 part, TI does not have a direct replacement for this. The CAT34 is a JEDEC 42.4 compliant temperature sensor, which a standard we do not have any sensors for. Our portfolio also does not currently have any temperature sensors with 2-kb of SPD EEPROM.

    We do have many parts which have an I2C/SMBus compatible interface, and exceed the CAT34's performance in terms of power consumption, accuracy, and other features.

    Our temperature sensing portfolio is very broad, so its hard to give a complete overview in this post, but we do have a brief overview on ti.com here: https://www.ti.com/sensors/temperature-sensors/overview.html

    Assuming they are interested in a digital output temperature sensor, you may want to take a look at the TMP1075 (upgraded performance of the LM75 industry standard), the TMP117 (our highest accuracy device), the TMP139 (our new I3C capable device), or one of our remote sensing devices such as the TMP461. These remote sensing devices are capable of monitoring both a local temperature and a number of external temperature diodes based on the number of channels. For example the TMP461 measures two temperatures (1 local and 1 remote), the TMP464 measures 5 temperature sites (1 local and 4 remote), and the TMP468 measures 9 sites (1 local and 8 remote).

    The best device will depend on their requirements for power consumption, accuracy, number of sensing sites, and their desired communication protocol. If you can share any more details on what their temperature sensing requirements are, we can provide a more specific recommendation and guidance. 

    Best Regards,
    Brandon Fisher

  • 0 in reply to Brandon Fisher94
    TI__Prodigy 585 points

    Thanks for the detailed info. I appreciate it!

    would like to follow up on a question. May I know what's the difference between TMP1075 and TMP75? Thanks

  • 0 in reply to Danny Cheng1
    TI__Mastermind 27535 points

    Hi Danny,

    The TMP1075 is an updated version of the TMP75, which is intended as a drop-in replacement for the TMP75. 

    As an overview, when compared to the TMP75, the TMP1075 has:

    • Better Accuracy 
    • Wider operating voltage (1.7 to 5.5V)
    • Lower power consumption
    • More available I2C addresses (up to 32)

    If you are trying to decide between the two, I would always recommend the TMP1075. 

    Best Regards,
    Brandon Fisher

  • 0 in reply to Brandon Fisher94
    TI__Mastermind 27535 points

    Hi Danny,

    One of my colleagues has pointed out that the Eagle Stream is a DDR5 platform.

    We would recommend the TMP139 for any DDR5 application, as it is a JEDEC DDR5 compliant temperature sensor. 

    Best Regards,
    Brandon Fisher

  • 0 in reply to Brandon Fisher94
    TI__Prodigy 585 points

    Hi Brandon,

    I found most of projects use TMP1075 for their design for VR14 scenario. Can you advise me on how is the difference between TMP1075 and cat34ts02vp2gt4c? great if you can itemize them. Thanks in advance!

  • 0 in reply to Danny Cheng1
    TI__Mastermind 27535 points

    Hi Danny,

    Going through the datasheet for both devices, here are the differences I noticed (I probably did not capture all of them).

    Differing Items TMP1075 CAT34ts02vp2gt4c
    Package 2.0x2.0 WSON 2x3 TDFN-8
    Pinout All pins except GND and V+ are differently positioned 
    Operating Supply Range 1.7V to 5.5V 3.3V +/-10%
    Operating Temp Range -55C to 125C -45C to 130C
    Storage Temp Range -60C to 130C -65C to 150C
    Absolute Maximum Ratings -0.3V to 6.5V on most pins -0.5V to 6.5V on most pins
    EEPROM No EEPROM Has EEPROM
    Temperature Error (MAX) +/- 1C from -40C to 75C +/- 1C from 75C to 90C
    +/- 2C from -55C to 125C +/- 2C from 40C to 125C
    +/- 3C from -20C to 125C
    Supply Current (Active Conversion, Idle Bus, MAX) 85uA 500uA
    Standby Current (bus Idle, MAX) 3.5uA 10uA
    I/O Leakage Current (MAX) 0.25uA 2uA
    Conversion Time (MAX) 7ms 100ms
    Available I2C Addresses 32 8
    I2C SCL Frequency 1KHz to 2.56 MHz 10kHz to 400kHz
    I2C Timeout Time 20ms to 30ms 25ms to 35ms
    I2C Spike Filter 50ns (TYP) 100ns (MAX)
    Register Map 5 Registers, including Device ID 8 Registers including device ID
    Only configuration registers are at the same address (do not align bitwise)
    Software Write Protect Not supported Supported

    These two devices are compatible in the sense that they can both operate at 3.3V and use I2C. However, the register maps and supported features are very different. Those kind of differences are hard to summarize in a table format like above. If the customer wants to have the option to use either, they could populate the footprints for both devices on a board, and read the ID registers to determine which one was present, and run code for that device accordingly. 

    Best Regards,
    Brandon Fisher