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TPS3808: About TPS3808 Spec Question

Cao Cao
Intellectual 770 points
Part Number: TPS3808

Hi Sir,

Could you help us to clarify question? Thanks.

1. Nominal supply voltage is mean VDD pin input ?

2. TPS3808G01 version SENSE pin normal use divider resistor ?

3. "Custom threshold voltages from 0.82 V to 3.3 V, 4.4 V to 5 V are available through the use of factory EEPROM programming. Minimum order quantities apply. Contact the factory for details and availability."

mean we can programming nominal supply voltage and threshold voltage?

or mean use divider resistor programming ?

No

  • 0
    TI__Genius 12630 points

    Cao Cao,

    I am not sure if this has been answered already so I will answer just to be sure.

    1. "Nominal supply voltage" means the input voltage to VDD pin so that if the SENSE pin is directly connected to VDD, the monitoring voltage threshold is about 7% lower than the supply voltage which is a standard error for these type of devices. This means that this device is waiting for your supply voltage to drop below 7% before triggering any reset. The actual threshold accuracy for this device is +/- 1% to the "Threshold Voltage". The supply voltage input VDD can be anything between 1.8V and 6.5V but the voltage that causes the reset is the voltage connected to SENSE. You can also use a resistor divider between VDD and SENSE or have VDD and SENSE on separate supplies.

    2. You can use a resistor divider but depending on the resistors, you can lose a little accuracy. You can also choose the device version with the desired SENSE threshold voltage for maximum accuracy.

    3. This means you can program the SENSE Threshold voltage which is the voltage that causes the device to reset. The VDD voltage is not programmable and will always be recommended between 1.7V and 6.5V. If you need a specific voltage to monitor, that isn't one of the options in the "Threshold Voltage" column above, and don't want to use a resistor divider, you can request from TI a specific threshold voltage so long as you meet a minimum order quantity.

    Thank you for using our devices! Let me know if you have any more questions.
    -Michael