SLVSGE8A november   2022  – june 2023 TPS35-Q1

PRODUCTION DATA  

  1.   1
  2. 1 Features
  3. 2 Applications
  4. 3 Description
  5. 4 Revision History
  6. 5 Device Comparison
  7. 6 Pin Configuration and Functions
  8. 7 Specifications
    1. 7.1 Absolute Maximum Ratings
    2. 7.2 ESD Ratings
    3. 7.3 Recommended Operating Conditions
    4. 7.4 Thermal Information
    5. 7.5 Electrical Characteristics
    6. 7.6 Timing Requirements
    7. 7.7 Switching Characteristics
    8. 7.8 Timing Diagrams
    9. 7.9 Typical Characteristics
  9. 8 Detailed Description
    1. 8.1 Overview
    2. 8.2 Functional Block Diagrams
    3. 8.3 Feature Description
      1. 8.3.1 Voltage Supervisor
      2. 8.3.2 Timeout Watchdog Timer
        1. 8.3.2.1 tWD Timer
        2. 8.3.2.2 Watchdog Enable Disable Operation
        3. 8.3.2.3 tSD Watchdog Start Up Delay
        4. 8.3.2.4 SET Pin Behavior
      3. 8.3.3 Manual RESET
      4. 8.3.4 RESET and WDO Output
    4. 8.4 Device Functional Modes
  10. 9 Application and Implementation
    1. 9.1 Application Information
      1. 9.1.1 CRST Delay
        1. 9.1.1.1 Factory-Programmed watchdog Timing
        2. 9.1.1.2 Adjustable Capacitor Timing
      2. 9.1.2 Watchdog Timer Functionality
        1. 9.1.2.1 Factory-Programmed watchdog Timing
        2. 9.1.2.2 Adjustable Capacitor Timings
    2. 9.2 Typical Applications
      1. 9.2.1 Design 1: Monitoring a Microcontroller Supply Voltage and Watchdog Timer
        1. 9.2.1.1 Design Requirements
        2. 9.2.1.2 Detailed Design Procedure
          1. 9.2.1.2.1 Setting the Voltage Threshold
          2. 9.2.1.2.2 Meeting the Watchdog Timeout Period
          3. 9.2.1.2.3 Setting the Reset Delay
          4. 9.2.1.2.4 Setting the Startup Delay and Output Topology
          5. 9.2.1.2.5 Calculating the RESET Pullup Resistor
  11. 10Power Supply Recommendations
  12. 11Layout
    1. 11.1 Layout Guidelines
    2. 11.2 Layout Example
  13. 12Device and Documentation Support
    1. 12.1 Receiving Notification of Documentation Updates
    2. 12.2 Support Resources
    3. 12.3 Trademarks
    4. 12.4 Electrostatic Discharge Caution
    5. 12.5 Glossary
  14. 13Mechanical, Packaging, and Orderable Information

Package Options

Mechanical Data (Package|Pins)
Thermal pad, mechanical data (Package|Pins)
Orderable Information

6 Pin Configuration and Functions

GUID-20210630-CA0I-QJPJ-GGTW-VML89JL3BFT0-low.svgFigure 6-1 Pin Configuration Option A
DDF Package, 8-Pin SOT-23,
TPS35-Q1 Top View
GUID-20210630-CA0I-QB3N-JCB7-3CZPPD31LPJX-low.svgFigure 6-3 Pin Configuration Option C
DDF Package, 8-Pin SOT-23,
TPS35-Q1 Top View
GUID-20210630-CA0I-08RM-BC36-BJPP13DHFRN7-low.svgFigure 6-2 Pin Configuration Option B
DDF Package, 8-Pin SOT-23,
TPS35-Q1 Top View
GUID-20210630-CA0I-KCHL-TNFG-6XS1K8BTWC5N-low.svgFigure 6-4 Pin Configuration Option D
DDF Package, 8-Pin SOT-23,
TPS35-Q1 Top View
Table 6-1 Pin Functions
PIN NAME PIN NUMBER I/O DESCRIPTION
PINOUT A PINOUT B PINOUT C PINOUT D
CRST 3 3 — — I Programmable reset timeout pin. Connect a capacitor between this pin and GND to program the reset timeout period. See Section 8.3.4 for more details.
CWD 2 2 — — I Programmable watchdog timeout input. Watchdog timeout is set by connecting a capacitor between this pin and ground. See Section 8.3.2.1 for more details.
GND 4 4 4 4 — Ground pin
MR 1 — 2 — I Manual reset pin. A logic low on this pin asserts the RESET. See Section 8.3.3 for more details.
RESET 7 7 7 7 O Reset output. Connect RESET to VDD using a pull up resistance when using open drain output. RESET is asserted when the voltage at the VDD pin goes below the undervoltage threshold (VIT-) or MR pin is driven LOW. For pinout options which do not support independent WDO pin, RESET is also asserted for watchdog error. See Section 8.3.4 for more details.
SET0 5 1 1 1 I Logic input. SET0, SET1, and WD-EN pins select the watchdog timer scaling and enable-disable the watchdog; see Section 8.3.2.4 for more details.
SET1 — 5 5 5 I Logic input. SET0, SET1, and WD-EN pins select the watchdog timer scaling and enable-disable the watchdog; see Section 8.3.2.4 for more details.
VDD 8 8 8 8 I Supply voltage pin. For noisy systems, connecting a 0.1-µF bypass capacitor is recommended.
WD-EN — — 6 2 I Logic input. Logic high input enables the watchdog monitoring feature. See Section 8.3.2.2 for more details.
WDI 6 6 3 3 I Watchdog input. A falling transition (edge) must occur at this pin before the timeout expires in order for RESET / WDO to not assert. See Section 8.3.2 for more details.
WDO — — — 6 O Watchdog output. Connect WDO to VDD using pull up resistance when using open drain output. WDO asserts when a watchdog error occurs. WDO only asserts when RESET is high. When a watchdog error occurs, WDO asserts for the set RESET timeout delay (tD). When RESET is asserted, WDO is deasserted and watchdog functionality is disabled. See Section 8.3.4 for more details.