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Original question:

ADC12QJ1600: Temperature Monitoring Diode change from LM95233 to TMP422 possible?

TMP422: Temperature Monitoring Diode change from LM95233 to TMP422 possible?

NY
Expert 3040 points
Part Number: TMP422
Other Parts Discussed in Thread: LM95233, ADC12QJ1600, , ADC09QJ1300EVM, TMP421, DXP

Hi team, 

my customer want to consider ADC12QJ1600 + temp sensor, we are promoting both LM95233 and TMP422.

Conncting to ADC, at TDIODE+/-, with Q1, NPN transister. (for example from reference design, ADC09QJ1300EVM) .

In case of TMP422, based on Datasheet, seems PNP transister is used. if customer use ADC1QJ1600 with TMP422, how to connect? 

I have asked same question on DC team, this is not be problem but they asked me to ask sensing team. please answer. 

  • 0
    TI__Mastermind 39825 points

    The schematic shown for LM95233 and ADC12QJ1600 features the ADC connected as remote temperature channel 1. The NPN, Q1, is connected as channel 2. The Q1 device is not necessary to measure the temperature of the ADC. In fact, a 2nd ADC could be connected as LM95233's channel 2. You could also use TMP421 instead of TMP422, which is a single-channel version. All remote temperature sensors, including LM95233, TMP421, and TMP422, report their own temperature in addition to the remote channels.

    When using other remote temperature sensors, the connections are the same. The ADC's TDIODE+ will connect to DXP or D+ or similar. For transistor connections, see the following figure. 

    The TMP422 device is unique in its I2C address assignment. It will use an address that corresponds with the polarity of its remote junctions, see below. Here you see DXP and DXN (D+ and D-) swap dependent on which address is needed. TMP421 has dedicated address pins, and doesn't have this added confusion. 

    thanks,

    ren