SNVU755A January   2021  – June 2021 TLV841

 

  1.   Trademarks
  2. 1Introduction
    1. 1.1 Related Documentation
    2. 1.2 TLV841 Applications
  3. 2Schematic, Bill of Materials, and Layout
    1. 2.1 TLV841EVM Schematic
    2. 2.2 TLV841EVM Bill of Materials
    3. 2.3 Layout and Component Placement
    4. 2.4 Layout
  4. 3EVM Connectors
    1. 3.1 EVM Test Points
    2. 3.2 EVM Jumpers
  5. 4EVM Setup and Operation
    1. 4.1 Input Power (VDD)
    2. 4.2 Monitoring Voltage on SENSE Pin (TLV841S)
    3. 4.3 Monitoring Voltage on VDD (TLV841M and TLV841C)
    4. 4.4 Manual Reset (MR) (TLV841M)
    5. 4.5 Reset Output (RESET)
    6. 4.6 Reset Time Delay Programming (Program tD via CT) (TLV841C)
  6. 5Revision History

4.5 Reset Output (RESET)

The TLV841EVM comes populated with TL841SADL01YBHR device variant which has an open-drain, active-low output topology for the RESET pin. The other device variants provide different output topolgies and can be used on this EVM. Note: if using a TLV841 device variant with push-pull output topology, the pull-up resistor must be disconnected by leaving jumper J1 open. The TLV841EVM provides an option to apply a separate pull-up voltage by leaving jumper J1 open and connecting the pull-up voltage to pin 2 [VPU] of jumper J1. The TLV841EVM provides jumper J3 and test point TP2 that is connected directly to the RESET pin for monitoring and/or interfacing to other devices.

The reset signal will be asserted low when:

  • The voltage on the SENSE pin falls below VIT- for the TLV841S version. See Figure 4-2
  • The MR pin is pulled low or when the voltage on the VDD pin falls below VIT- for the TLV841M version
  • The voltage on the VDD pin falls below VIT- for the TLV841C version.
  • For TLV841M and TLV841C device variant option, the propagation detect delay tP_HL when VDD goes below VIT-.
For TLV841M (MR pin > VOH) and TLV841C, when the voltage on VDD or when TLV841S SENSE pin monitoring voltage rises above (VIT+ + VHYS), the output reset pin will de-assert and remain de-asserted until a reset condition occurs again. Please refer to TLV841 datasheet for more information on the RESET output and how it reacts to start up conditions and minimum values of VDD.

Figure 4-2 TLV841EVM RESET Propagation Detect Delay