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TIC12400-Q1: Interface forum

Bin Hu
Prodigy 10 points
Part Number: TIC12400-Q1
Other Parts Discussed in Thread: TIC12400,

About the minimize current conssumption, only the polling times,the polling active time, number of channels, wetting current could 

affect the current ?

For Domain Controller which use TIC12400, when Domain Controller is in normal mode , these registers are configured.

When Domain Controller prepare to go to sleep mode , should these reigisters re-configure to reset state ? such as  

ADC_DIAG_T, VS_MEAS_EN, CRC_T.

  • 0
    TI__Genius 12871 points

    Hi Bin,

    When the device is powered up for the first time, there is a condition is called Power-On Reset (POR), that configures the registers to their default values & initializes the device state machine. The datasheet describes that the configuration registers turn into read-only registers after switch monitoring initiates (section 8.3.4) "with the exception of the TRIGGER, CRC_T, and RESET bits in the CONFIG register and all bits in the CCP_CFG1 register. If at any time the device setting needs to be re-configured, the microcontroller is required to first set the bit TRIGGER in the CONFIG register to logic 0 to stop wetting current and switch monitoring." Setting the CRC_T bit to a 1 will trigger a CRC calculation, that self-clears when finished.

    In polling mode, the aim is to reduce current draw and run in a low-power state. The current sources and sinks turn on and off. Additionally, the MCU can go to sleep to further reduce the system power. The datasheet mentions that the ADC diagnostic feature runs in polling mode. The VS measurement feature can be enabled / disabled every polling cycle.

    Section 8.3.5 "Device Reset" describes the only conditions under which the TIC12400-Q1 will re-initialize all registers to their default values: 1)  Section 8.3.5.1 VS Supply POR, 2) 8.3.5.2 Hardware Reset and 3) 8.3.5.3 Software Reset. The MCU going into sleep mode is independent of these conditions.

    Regards, Amy