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CC2541: About reset pin

Mike Wu1
Genius 3271 points

Part Number: CC2541

Hi, 

My customer has some questions about the reset pin of CC2541 after he check the reference design : CC2541 SensorTag Reference Design 1.4 (Rev. B)

1/ Reset terminal (at R201#1)= Floating/open, R201(V) & C201(V), can system reset okay?

2/ Reset terminal (at R201#1)= Floating/open, R201(V) & C201(X), can system reset okay?

3/ Reset terminal (at R201#1)= Floating/open, R201(X) & C201(V), can system reset okay?

4/ Reset terminal (at R201#1)= Floating/open, R201(X) & C201(X), can system reset okay?

5/ Reset terminal (at R201#1)= VDD, R201(V) & C201(V), can system reset okay?

6/ Reset terminal (at R201#1)= VDD, R201(V) & C201(X), can system reset okay?

7/ Reset terminal (at R201#1)= VDD, R201(X) & C201(V), can system reset okay?

8/ Reset terminal (at R201#1)= VDD, R201(X) & C201(X), can system reset okay?

9/ C201 must be used?

10/ For flash programming pins: RESET_N, SLC, SDA.

How should they be connected when chip is in normal operation?

e.g. RESET_N, SLC, SDA are all floating/open okay?

Please help to provide comments, thanks.

  • 0
    TI__Mastermind 48611 points

    Mike,

    What do the (X) and (V) mean?

    For the system reset to work properly, R201#1 should not be floating but connected to VDD and pulled down for at least 1us for the device to power back on (see Figure 2 in the datasheet).

    C201 is required. With the component values shown in the schematic, the RC time constant (rise time) is 2.7us, which is enough time to ensure all registers are cleared when the device is being powered on.

    As to the question regarding flash programming, see here. The appnote mentioned in this thread is here.

    RESET_N must be high during normal operation.

    BR,

    Seong