Texas Instruments TLV841EVM, User Manual

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The recommended maximum delay capacitor for the TLV841C is limited to 10 µF as this ensures there is enough
time for the capacitor to fully discharge when the reset condition occurs. When a voltage fault occurs, the
previously charged up capacitor discharges, and if the monitored voltage returns from the fault condition before
the delay capacitor discharges completely, the delay capacitor will begin charging from a voltage above zero and
the reset delay will be shorter than expected. Larger delay capacitors can be used so long as the capacitor has
enough time to fully discharge during the duration of the voltage fault.
The TLV841EVM provides jumper J6 to configure the CT pin and test point TP3 to monitor the CT pin. Place a
shunt jumper on pin 1 (left pin) and pin 2 (middle pin) of jumper J6 to connect CT to delay capacitor C2. This
connects the CT pin to a 0.01 µF capacitor to set the RESET delay (t
D
) to ~6.2 ms. Place a shunt between pin
2 (middle pin) and pin 3 (right pin) of jumper J6 to connect CT to delay capacitor C3. This connects the CT pin
to a 0.1 µF capacitor to set the RESET delay (t
D
) to ~61.9 ms. By removing the shunt jumper from jumper J6,
the RESET time delay defaults to the minimum value of 80 µs or less. If using a different delay capacitor, the
capacitor must be ≥ 100 pF to be recognized.
For the TLV841M / TLV841S variant or TLV841C where C
T
is floating, Figure 4-3 shows the typical reset delay
time. Depending on how much VDD deviates from the specified threshold, the typical reset delay value (~40 µs)
may be shorter or longer.
Reset Delay (t
D
) = 46.8 s
VDD
RESET
Figure 4-3. TLV841EVM RESET Delay Time (t
D
) for TLV841S/M or for TLV841C where C
T
Pin Is Floating
5 Revision History
NOTE: Page numbers for previous revisions may differ from page numbers in the current version.
Changes from Revision * (January 2021) to Revision A (June 2021) Page
• Updated supply voltage from 6 V to 5.5 V.......................................................................................................... 2
• Updated schematic............................................................................................................................................. 5
• Included supply voltage range for TLV841C and TLV841M with open-drain and push-pull outputs................. 11
Revision History www.ti.com
14 TLV841EVM Voltage Supervisor User Guide SNVU755A – JANUARY 2021 – REVISED JUNE 2021
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